Pulse Oximeters

Description

Pulse oximetry detects oxygen saturation in the bloodstream. The reading is useful as a general health monitor because the degree of oxygen saturation can be an early detector of medical problems involving the heart and lungs.

Operation is based on the light-absorption characteristics of hemoglobin in the blood. Oxygenated hemoglobin absorbs more infrared light than red light, and deoxygenated hemoglobin absorbs more red light than infrared light. Thus, red and infrared LEDs in the oximeter alternately transmit light, and a photodiode receives the light that is not absorbed. The ratio of the red and infrared light received by the photodiode is used to calculate the percentage of oxygen in the blood. Based on the pulsatile nature of arterial blood flow, the pulse rate and strength are also determined and displayed during the measurement cycle.

The reflected light signal is algorithmically processed to determine the degree of oxygen saturation. Most pulse oximeters display the oxygen level and pulse as they are sensed. Some products provide logging, and some provide wireless communication to and from a host device for a larger display.

Older products used a sensor cable that attached to a base pulse oximeter. Modern designs digitize the signals within a single enclosure, negating the need for a base unit in many cases. A modern design will also optionally feature a standardized wireless interface like low-power Bluetooth to send data to a capture or display device like a tablet or smartphone.

Today, accurate consumer-grade pulse oximeters are moderately priced and come with a variety of features such as data logging. Logging allows monitoring of oxygen levels, for example, to detect sleep apnea, and allows tracking of heart rate over time, which can help determining the existence of some heart conditions.

Please click on the "design consideration," "circuits," and "block diagram" tabs for more information on how to design a modern pulse-oximetry monitor.


From an analog design perspective, the most challenging part of the design is building the light transmitter and detection circuit. Usually two wavelengths of light are used—ultraviolet and red—so two transmitters and two detector circuits are needed. In addition, usually only one of the two LEDs is illuminated at one time; this functionality is built into the control circuit. Once the microcontroller accurately receives the signal, the internal algorithm processes the signals to determine the oxygenation factor and the heart rate.

LED Transmit and Receive Path


As can be imagined, the received signal levels are very small, so the design requires very accurate and precise detection circuitry. Today, most high-volume pulse ox sensors utilize highly integrated circuitry that contains both transmitting LEDs and photodetectors for both wavelengths. Sensors are available from multiple sources that provide complete detection and conversion to digital within a single IC. Unless a design has requirements beyond those of the standard pulse ox application, it is best to select an integrated light sensor with a digital output.

For those who need to design their own sensor signal chain, the following diagrams can provide some guidance.

Figure 1. Simplified red and infrared LED bias and control circuit.

This driver design allows easy setting of the drive currents by setting a DAC. The two phase signals are digital on and off to control turn the LEDs on and off. For more information, refer to Application Note 4671: Improve Sensor Performance and SNR in Pulse Oximeter Designs.

Figure 2. Simplified photodiode receive path circuit.

In Figure 2, the key specifications for the TIA amplifier are extremely low input current, input current noise, and input voltage noise, as well as high-voltage operation. These characteristics are necessary to maximize the SNR so that the small currents of interest can be measured amid the large ambient currents. High-voltage operation means that a larger feedback resistor can be used to easily amplify the ambient and received LED current before removing the ambient portion with a highpass filter. The remaining small signal of interest is then amplified to maximize the ADC's dynamic range. This gain stage should be programmable to compensate for changing environmental factors and the aging of optical components.

The key specifications for the ADC are high SNR and sample rate. The sample rate should be fast enough to capture the modulated signal and perform the required digital processing, which is different for each manufacturer.

Because the optical properties of an LED can drift over time, it is important that a pulse oximeter have a built-in method of calibration.

Product Selection

The MAX30100 is an integrated pulse oximetry and heart-rate monitor sensor solution. It combines two LEDs, a photodetector, optimized optics, and low-noise analog signal processing to detect pulse oximetry and heart-rate signals.

View the block diagram for product recommendations.

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Microcontroller


The microcontroller selection will depend on the degree of analog functionality and precision needed, which will depend on the sensor signal-chain construction—whether it is a single-chip sensor with a digital output, or a proprietary sensor with a custom analog signal chain. If the input from the sensor is serial digital, then a lower cost processor similar to a low–power, 32-bit ARM controller would suffice. Other functions to consider include display driving capability if a display is included in the device.

Product Selection

The MAX32600 microcontroller is based on the industry-standard ARM® Cortex®-M3 32-bit RISC CPU operating at up to 24MHz. It includes 256KB of flash memory, 32KB of SRAM, a 2KB instruction cache, and integrated high-performance analog peripherals. This product is a good fit if very precise analog processing needs to be integrated onto a single microcontroller to meet product size requirements.

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Power


Depending on the design, the power will be supplied by a single-cell Li+ battery for mobile or wearable devices, or a more traditional power from line via a "wall wart" type transformer.

For a mobile or wearable device, the power supply will consist of either battery only (replaceable ) or rechargeable batteries combined with a Micro-USB port for recharge power and for data.

In both cases the power rails are supplied through either individual step-down, step-up, or LDO voltage converters.

Product Selection

The MAX14676/MAX14676A ICs are battery-charge-management solutions ideal for low-power wearable applications. These devices include a linear battery charger with a Smart Power Selector™, ModelGauge™ fuel gauge, and several power-optimized peripherals. They feature an ultra-low-power buck regulator with a quiescent current of 900nA (typical) and 74% efficiency with 10μA output.

For more design information, please review the application notes specified to the right, view the circuits listed under the "circuits" tab, and view the block diagrams listed under the "block diagrams" tab.

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Serializer Enables Use of Coax Cables, Reducing Weight and Cost of Cabling in Automotive Infotainment

MAX9291 Functional Diagram

3.12Gbps GMSL Serializer for Coax or STP Output and HDMI Input. The MAX9291 converts an HDMI input to a Gigabit multimedia serial link (GMSL) output for transmission of video, audio, and control signals over 15m or more of 50Ω coax or 100Ω shielded twisted-pair (STP) cable. The serializer pairs with any GMSL deserializer capable of coax input. When programmed for STP output the serializer is backward compatible with any GMSL deserializer. The output amplitude is programmable 100mV to 500mV single-ended (coax) or 100mV to 400mV differential (STP).

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Includes a linear battery charger with smart power selector and power-optimized peripherals.

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24-Bit, 4-Channel, Simultaneous-Sampling, Sigma-Delta ADC

MAX11040K

The device allows simultaneous sampling of as many as 32 channels using a built-in cascade feature to synchronize as many as eight devices. The serial interface of the MAX11040 allows reading data from all the cascaded devices using a single command.

Dual/Quad Camera Power Protector

MAX20087

ASIL-grade protector delivers up to 600mA load current to each of four output channels with high-side current limit and I2C diagnostics.

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1.7V, 0.9µA, Comparators with Built-in Reference

MAX40000, MAX40001

nanoPower Comparators in an Ultra-Tiny 0.76mm x 1.11mm Package

60V, No-Opto Isolated Flyback Controller

MAX17690

Compact, cost-effective, and easy-to-implement isolated DC-DC controller.

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Simplified Multichemistry SMBus Battery Charger

MAX8713

This multichemistry battery charger simplifies construction of smart chargers with a minimum number of external components. It uses the Intel System Management Bus (SMBus™) to control the charge voltage and charge current.

Tiny Ultra-Low Noise LDO

MAX8840

This ultra-low-noise, low-dropout (LDO) linear regulator can deliver up to 150mA continuous output current while achieving a low 120mV dropout for 120mA load current.

4V to 42V, 100mA, High-Efficiency, uSLIC Step-Down Power Module

MAXM17532

0.9V to 5.5V output with integrated controller, FETs, inductor and compensation in a 2.6mm x 3mm x 1.5mm uSLIC package.

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60V In, Low parts count Switching Regulator provides 500mA

MAX17501F

Providing output currents up to 0.5A, this synchronous step-down switching regulator handles input voltages of up to 60V. In addition, this product features very efficient internal synchronous FET switches so you can reduce your power supply board space to a minimum.

Design in EE-Sim

Industry's Most Integrated Metering ICs with Best-in-Class Accuracy Performance

71M6541DT

4th-generation single-phase metering system-on-chip (SoC) ICs with MPU core, low-power RTC, and LCD driver. This IC supporst a wide range of metering applications with very few external components.

6-Channel, Low-Power, 3.75kVRMS SPI Digital Isolator

MAX14483

Each channel optimized for SPI, includes 10ns (typ) propagation delay

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Secure Authenticator with 1-Wire SHA-256 and 512-Bit User EEPROM

DS28E15

Secure authenticator features factory-programmed, unique 64-bit ROM identification number.

Ultra-Low Power PMIC with 3-Output SIMO and Charger Optimized for Small Li+ Batteries

MAX77650-MAX77651

Highly Integrated with Ultra-Low 6.5µA Operating Current

Low-Noise 500mA LDO Regulator in a 2mm x 2mm TDFN Package

MAX8902

Provides High 92dB PSRR at 5kHz for Handheld, Battery-Powered Devices

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Industrial, Octal, Digital Input Translator/Serializer

MAX31913

Robust, low power serialization of 24V digital signals to 5V minimizes optocouplers needed for isolation

36V, 600mA Mini Buck Converter with 3.5µA IQ

MAX20075

Synchronous buck with integrated high-side and low-side switches delivers up to 0.6A from 3.5V to 36V input, while using only 3.5µA quiescent current at no load.

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Multichemistry Battery Charger with Automatic System Power Selector

MAX8725

Highly integrated control IC simplifies construction of accurate and efficient multichemistry battery chargers. Can be programmed by a host microcontroller (µC) or hardwired. High efficiency is achieved through use of buck topology with synchronous rectification.

High-Voltage Transmit/Receive Switch

MAX4936-MAX4939

This octal, high-voltage, transmit/receive (T/R) switches is based on a diode bridge topology and features . The amount of current in the diode bridges can be programmed through an SPI™ interface.

Ultra-Low-Power Arm® Cortex®-M3 with Wellness Sensor Analog Front-End, Advanced Hardware Security, 256KB Flash and 32KB SRAM

MAX32600

Very Accurate RTC With Integrated MEMs Resonator

DS3231M

This low-cost, extremely accurate I²C real-time clock (RTC) has an integrated temperature-compensated crystal oscillator (TCXO) and crystal and features ±3.5ppm accuracy from -40°C to +85°C.

SFF/SFP Laser Driver with Extinction Ratio Control

MAX3738

This laser driver is designed for multirate transceiver modules with data rates from 1Gbps to 4.25Gbps. Lasers can be DC-coupled to the MAX3738 for reduced component count and ease of multirate operation.

Micropower, Uni-/Bidirectional, Current-Sense Amplifiers

MAX9928/9F

These low-cost, uni-/bidirectional, high-side, current-sense amplifiers are ideal for monitoring battery charge and discharge currents in portable equipment. These devices feature a wide -0.1V to +28V input common-mode voltage range, low 20µA supply current, and a gain accuracy better than 1.0%.

IO-Link Device Transceiver

MAX14820

This transceiver is suitable for IO-Link® devices and 24V binary sensors/actuators. All specified IO-Link data rates are supported.

225MHz to 3800MHz RF Power Amplifier Linearizer

SC1894

The SC1894 is a fully adaptive, RFin/RFout predistortion linearization solution optimized for a wide range of amplifiers, power levels, and communication protocols.

Low-Power I2C Temperature Sensor in WLP Package

MAX31875

Local temperature sensor with ±2°C-accuracy and I2C/SMBus interface

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Ultra Small Voltage Doubler

MAX1682-3

Accepting input voltages from +2.0V to +5.5V, these switched-capacitor voltage doublers are highly efficient and ideal devices.

11.32Gbps Transceiver with Dual CDRs, Digital Monitors, and DC-Coupled Laser Driver

MAX3955

This 11.3Gbps, highly-integrated, low-power transceiver with dual CDRs, and digital diagnostics monitoring (DDM) is designed for next-generation SONET transmission systems.

IO-Link Device Transceiver

MAX14827

Integrates high-voltage functions commonly found in industrial sensors, including drivers and regulators

Wearable Power Management Solution for Primary Cells

MAX20310

Wearable Power Management for Single-Cell Zinc Air, Silver Oxide, and Alkaline Battery Architectures

2.75V to 4.8V Input, 10mA Output, 35μVRMS Ultra Low Noise and Ripple Boost Regulator

MAX77231

Compact boost with only 35µVRMS ripple and noise.

LED Backlight Driver with Wide Dimming Range

MAX16814

Meets automotive display brightness requirements

High-Efficiency, 1.5MHz Op Amps with RRIO

MAX9617

These are zero-drift operational amplifiers available in space-saving SC70 packages. They feature rail-to-rail CMOS inputs and outputs and zero-drift input offset voltage over time and temperature.

High Accuracy Voltage Output DAC with SPI Interface

MAX5316

This high-accuracy, 16-bit, serial SPI input, buffered voltage output digital-to-analog converter (DAC) in a 4mm x 5mm, 24-lead TQFN package features ±1 LSB INL (max) accuracy.

60V In, Low parts count Switching Regulator provides 1.7A

MAX17505

Providing output currents up to 1.7A, this synchronous step-down switching regulator handles input voltages of up to 60V. In addition, this product features very efficient internal synchronous FET switches so you can reduce your power supply board space to a minimum.

Design in EE-Sim

18-Bit, Low-Power, Multichannel, Oversampling Delta Sigma ADC

MAX1403

This is a low-power, multichannel, serial-output analog-to-digital converter (ADC) features matched 200µA current sources for sensor excitation. This ADC uses a sigma-delta modulator with a digital decimation filter to achieve 16-bit accuracy and has programmable gain.

Single, Quick-PWM, Step-Down Controller with Dynamic REFIN

MAX17024

High efficiency, excellent transient response, and high DC-output accuracy, accepts inputs as low as 2V.

High-Speed Precision Current-Sense Amplifier

MAX9643

This high-speed 60V precision unidirectional current-sense amplifier is ideal for a wide variety of power-supply control applications. Its high signal bandwidth allows its use within DC-DC switching converter power-supply control loops with minimal phase delay.

Ultrasmall, 60V In, Switching Regulator provides 100mA

MAX17552

This step-down switching regulator has a high input voltage range; internal synchronous switches and delivers up to 100mA out. It is available in two ultra small packages.

Design in EE-Sim

Extremely Accurate RTC With Memory

DS3234

This real-time clock IC with integrated crystal is extremely accurate, It offers an SPI bus interface and 256 bytes of battery-backed SRAM, and features ±3.5ppm accuracy from -40°C to +85°C.

Ultra-Low Power Arm® Cortex® M4 with FPU Microcontroller for Wearables and IoT, with 2MB Flash and 512KB SRAM, and Advanced Cryptographic Hardware Engines

MAX32630/MAX32631

The MAX32630/MAX32631 feature an Arm® Cortex®-M4 with FPU CPU that delivers ultra-low power, high-efficiency signal processing functionality with significantly reduced power consumption and ease of use.

Development platform for MAX14871

MAXREFDES89

This mbed®-compatible, Arduino® form factor shield allows rapid development of brushed DC motor applications. The shield contains four MAX14871 full-bridge DC motor drivers for driving up to 4 motors while two MAX5387 digital potentiometers provide the ability to set the motor current limit.

Industrial Power Himalaya Switching Regulators

Himalaya step-down regulators

These high-voltage (up to 60V), synchronous step-down DC-DC converters with integrated MOSFETs are accurate to within ±1.75% over the -40°C to +125°C temperature range. This family contains regulator ICs that can deliver output currents in the range of 25mA to 5A.

Industrial Power Step-down Power Modules

High-efficiency, high-voltage DC-DC step-down power modules

These power modules combine an efficient Maxim switching regulator, a fully shielded inductor, and numerous other passive components into one low-profile, thermally-efficient system-in-package (SiP). These modules operate over the industrial temperature range.

2.75kVRMS Isolated RS-485 Transceiver

MAX14853

Full-duplex, 500kbps RS-485 with ±35kV ESD protection and integrated transformer driver

Cold-Junction Compensated Thermocouple-to-Digital Converter

MAX31855

The MAX31855 performs cold-junction compensation and digitizes the signal from popular thermocouples. The data is output in a signed 14-bit, SPI-compatible, read-only format. This converter resolves temperatures to 0.25°C, allows readings as high as +1800°C and as low as -270°C.

低電力、4/8/12チャネルシリアル8ビットADC

MAX11600-5

これらの8ビット、マルチチャネル、アナログ-デジタルコンバータ(ADC)は、トラック/ホールド(T/H)、電圧リファレンス、クロック、およびI²C対応2線式シリアルインタフェースを内蔵しています。

Flexible RTC with Multiple Programmable Features and Low Current

DS1339

Low-power clock/date device with two programmable time-of-day alarms and a programmable square-wave output and built-in backup supply switch

High-Precision Digital Thermometer and Thermostat

DS7505

The DS7505 low-voltage (1.7V to 3.7V) digital thermometer and thermostat provides 9-, 10-, 11-, or 12-bit digital temperature readings over a -55°C to +125°C range with ±0.5°C accuracy over a -0°C to +70°C range.

500mA, 76V, High-Efficiency Step-Down DC-DC Converter

MAX5033

This easy-to-use, high-efficiency, high-voltage, step-down DC-DC converter operates from an input voltage up to 76V and consumes only 270µA quiescent current at no load.

Ultra Small Voltage Inverter Provides 200mA

MAX889

Need -5V? This inverting charge pump circuits provides a negative Vin rail at up to 200mA.

12-Switch Matrix Manager for Automotive Lighting

MAX20092

Single/dual/quad-string configurations, programmable 12-bit PWM dimming, enables matrix/pixel lighting up to 1.5A

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20-Port Programmable Mixed-Signal I/O with 12-Bit ADC, 12-Bit DAC

MAX11300

Configurable High-Voltage Mixed Signal I/O Device offers 20 mixed-signal high-voltage, bipolar ports configurable as ADC analog input, DAC analog output, a general-purpose input port (GPI) or general-purpose output port (GPO).

Ultra-Accurate Local Temperature Sensor

MAX31726

This IC converts the temperature measurements to digital form using a high-resolution, sigma-delta, analog-to-digital converter (ADC). Accuracy is ±0.5°C from -40°C to +105°C. Communication is through an I2C-compatible 2-wire serial interface.

2.5kVRMS Complete Isolated RS-485/RS-422 Module Transceiver + Power

MAXM22511

Supports 25Mbps data rates while providing 60% DC-DC efficiency and ±35kV electrostatic discharge protection

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MAC/PHY Powerline Transceiver

MAX2992

This powerline communication (PLC) baseband modem delivers half-duplex, asynchronous data communication over AC power lines at speeds up to 300kbps (full FCC band data rate).

24-Bit Multi-Channel Low-Power 1.9ksps Delta-Sigma ADC with PGA

MAX11410

Optimized for Precision Sensor Measurement and More Efficient System Design

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High-Efficiency, Step-Up DC-DC Converter in TSOT packag

MAX1724

This step-up DC-DC converter is an ultra-small device featuring a low supply current of 1.5µA, making it optimal for a variety of handheld instruments.

Low-Power Transimpedance Amplifier for 10GBASE-SR Applications

MAX3797

This device is a low-power transimpedance amplifier incorporating an automatic gain control (AGC) architecture and is designed for optical transmission systems at data rates up to 10.3125Gbps and for use with PIN diodes.

4.6Gsps Cable Downstream Direct RF Synthesis DAC

MAX5882

This 14-bit, 4.6Gsps digital-to-analog converter (DAC) is designed for direct RF synthesis of multicarrier quadrature amplitude modulation (QAM) signals in cable modem termination systems (CMTS) and edge QAM (EQAM) devices.

Single-Phase Energy Measurement Processor

78M6610+PSU

This is a single-core energy measurement processor for single-phase power supplies. It is designed specifically for real-time monitoring at the input of AC-DC power converters used in data centers and IT server rooms.

16-Bit, Low-Power, Buffered Output, Rail-to-Rail DAC

MAX5216

Less than 80µA IQ in 3mm x 5mm, 8-Pin µMAX

Industry's Smallest 1.55A 1-Cell Li+ DC-DC Charger

MAX8971

This device charges quickly with minimal heat generation. It charges from variety of adapters and maximizes Safety featuring JEITA-compliant temperature monitoring and withstands transient inputs up to 22V.

DeepCover Secure SHA-3 Authenticator with ChipDNA PUF Protection

DS28E50

Simple, cost-effective protection with SHA3-256 crypto engine, ChipDNA secured data, and 2kB EEPROM

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Tiny Serial 12-Bit ADC

MAX11108

A tiny (2.1mm x 1.6mm), 12-bit, compact, high-speed, low-power, SAR ADC. This high-performance ADC includes a high-dynamic range sample-and-hold and a high-speed serial interface. Accepts a full-scale input from 0V to the power supply or to the reference voltage.

36V Step-Down Regulator with 3A Integrated Switches and 15μA Operating Current

MAX20003

This synchronous buck regulator with integrated high-side and low-side MOSFETs is designed to deliver up to 3A with input voltages from 3.5V to 36V, while using only 15µA quiescent current at no load. Voltage quality can be monitored by observing the PGOOD signal. The device can operate in dropout by running at 98% duty cycle, making it ideal for automotive applications.

Femtocell Radio Reference Design

Femtocell Radio Reference Design

This reference design is based on the MAX2550 and contains all of the relevant components necessary to design and build a competitive radio solution to support the base-station transceiver (BTS) frequency band: 1920MHz to 1980MHz (Rx) and 2110MHz to 2170MHz (Tx).

500mA, Low-Voltage Linear Regulator in µMAX

MAX1806

Delivers Low Input with ±1% Output Voltage Accuracy

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3-Output SIMO Buck-Boost Regulator with Power Sequencer and 3μA IQ

MAX77681

Always-on, low-power mini PMIC improves battery life by replacing inefficient LDOs and enables 15.5mm2 total solution size.

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RTD-to-Digital Temperature Sensor Interface

MAX31865

Provides 0.5°C total accuracy with fault detection and ±45V input protection

2.2MHz, 500mA Dual Step-Down Converter for Automotive Cameras

MAX20019

Ultra-small, 3.5V to 17V input, dual regulators includes high-side and low-side MOSFETs and 500mV enable hysteresis.

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小型、低電力2Msps/3Msps 12ビットADC

MAX11102

高性能ADCは、広ダイナミックレンジのサンプル/ホールドおよび高速シリアルインタフェースを内蔵しています。これらのADCは、0Vから電源またはリファレンス電圧までのフルスケール入力を許容し、消費電力は3Mspsでわずか5.2mW、2Mspsでは3.7mWです。

Multichannel Integrated Power Management IC

MAX77752

Highly integrated power management for computationally intensive platforms.

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Step-Up Converter for Handheld Applications

MAX8969

The MAX8969 is a simple 1A step-up converter in a small package that operates in any single-cell Li-ion application. This IC provides protection features such as input undervoltage lockout, short circuit, and overtemperature shutdown.

Transformer Driver Enables Efficient Isolated Power

MAX13253

This 1A push-pull transformer driver featuring integrated protection and an internal oscillator, making it the ideal device for isolated power supplies.

低電力シリアル12/10ビット、8/16チャネルADCファミリ

MAX11132

業界をリードする1.5MHz、完全リニア帯域幅、高速、低電力、12ビットシリアル出力の逐次比較型(SAR) ADCです。

Direct-Conversion DAB Tuner

MAX2173

Facilitates low-power, tuner-on-board designs

Optical Microcontroller

DS4830A

This 16-bit microcontroller with a unique peripheral set supports optical applications that require high-resolution conversion of many analog signals and digital signal processing (DSP) of those signals, high-speed data communication to an external host, and ultra-low power dissipation.

3.5V – 36V, 2A/3A, Synchronous Buck Converter with 15μA Quiescent Current and Reduced EMI

MAX17242

Reliable Operation (42V Input Transient Protection), Long Battery Life (15µA IQ) and EN55022 EMI Performance.

36V, 300mA Mini Buck Converter with 1.1µA IQ

MAX16956

Small, synchronous buck converter with integrated high-side and low-side switches.

28V Linear Li+ Battery Charger with Smart Autoboot Assistant

MAX8814

This intelligent, stand-alone constant-current, constant-voltage (CCCV), thermally regulated linear charger is designed for charging a single-cell lithium-ion (Li+) battery. This tiny charging solutions integrates many functions making it an ideal fit in smart phones, USB appliances, and Bluetooth equipment.

Octal, High-Speed, High-Side Switch/Push-Pull Driver

MAX14912/MAX14913

Robust 24V driver, capable of 200kHz switching rate

1A, 60V High-Efficiency, DC-DC Step-Down Power Module with Integrated Inductor

MAXM17502

Enables cooler, smaller, simpler power-supply solutions.

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High-Output-Drive I/O Op Amp

MAX4231

Family of single/dual/quad, high-output-drive CMOS op amps feature 200mA of peak output current, rail-to-rail input, and output capability from single 2.7V to 5.5V supply.

Precision, Low-Power, 90µA, Single/Quad/Dual Op Amps

MAX44244

Ultra-precision, low-noise, zero-drift single/quad/ dual operational amplifiers featuring very low-power operation with a wide supply range. The devices incorporate a patented auto-zero circuit that constantly measures and compensates the input offset to eliminate drift over time and temperature as well as the effect of 1/f noise.

Ultra-Low-Power PMIC with 3-Output SIMO

MAX77650

PMIC features SIMO buck-boost regulator and a 150mA LDO.

Low-Power, High-Performance, Fully Integrated Octal Ultrasound Receiver

MAX2079

A fully integrated octal ultrasound receiver is optimized for high channel count, high-performance portable and cart-based ultrasound systems.

Low-Noise for High-Voltage Applications

MAX4426

This precision, low-noise, high performance op amp for high-voltage applications offers near-zero DC offset and drift through the use of patented chopper stabilized and auto-zeroing techniques.

16-bit DAS with Delta-Sigma ADC, DACs, UPIOs, RTC, Voltage Monitors, and Temp Sensor

MAX1358B

This DAS is based on a 16-bit, sigma-delta ADC and system-support functionality for a microprocessor based system. This device integrates an ADC, DACs, op amps., internal selectable-voltage reference, temperature sensors, analog switches, a 32kHz oscillator, a real-time clock (RTC) with alarm and more.

3.12Gbps GMSL Serializers

MAX9291/MAX9293

Enables use of coax cables, reducing weight and cost of cabling in automotive infotainment.

4.5 to 60V, 5A, High-Efficiency Step-Down Converter

MAX17506

Includes integrated high-side MOSFET with output from 0.9V up to 0.9 x VIN in a 5mm x 5mm TQFN

Multichannel 16-bit Simultaneous-Sampling ADCs

MAX11046

Featuring independent track and hold (T/H) and SAR circuitry, these SAR ADCs provide simultaneous sampling at 250ksps for each channel and provide a high speed parallel output.

Switch-Mode Li+ Chargers JEITA Battery Temperature Monitoring

MAX8900

High-frequency, switch-mode chargers for a 1-cell lithium ion (Li+) or lithium polymer (Li-Poly) batteries. These ICs deliver up to 1.2A of current to the battery from 3.4V to 6.3V (MAX8900A/MAX8900C) or 3.4V to 8.7V (MAX8900B). Ideally suited to small portable devices such as headsets and ultra-portable media.

Femtocell Radio参考设计

Femtocell Radio参考设计

该设计中,MAX2550作为主要的射频(RF)收发器,配合必要的外部元件构成完整的射频前端。外部元件包括:功率放大器、双工器、TCXO和无源器件。

Compact, 14-Bit, 1.6Gbps GMSL Serializer

MAX96711

With line-fault detection and CRC protection of video and control data for ADAS.

25mA, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converter

MAX17550

This high-efficiency, high-voltage, synchronous step-down DC-DC converter has integrated MOSFETs and operates over a 4V to 60V input and has an adjustable Switching Frequency range of 100kHz to 2.2MHz with external synchronization.

Design in EE-Sim

Low-Power, Fully Differential 20 bit SAR ADC

MAX11905

This ADC provides excellent static and dynamic performance with best-in-class power consumption that directly scales with throughput.

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3µA 1-Cell Fuel Gauge with ModelGauge

MAX17048

Maximize Battery Run-Time with Industry's Smallest Size, Lowest Power Fuel Gauge

High-Performance, Ultra-Low Power ARM Cortex-M4F with FPU-Based Microcontroller for Rechargeable Devices

MAX32620/MAX32621

Ultra-Low Power Cortex-M4F for Wearable Medical and Fitness Applications

Low-Current I²C RTC with 56-Byte NV RAM

DS1308

Low-power, full BCD real-time clock and calendar compatible with any 32.768kHz crystal.

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Single-Channel, Ultra-Low-Power, Delta-Sigma ADCs with Programmable Gain

MAX11206

Simple silicon pressure sensor-to-digital SPI bus interface. Nice solution for off board pressure sensor applications.

High-Efficiency Buck-Boost Regulator

MAX77801

The MAX77801 is a high-current, high-efficiency buck-boost targeted to mobile applications that use a Li-ion battery or similar chemistries. The MAX77801 utilizes a four-switch H-bridge configuration to support buck and boost operating modes. Buck-boost provides 2.60V to 4.1875V of output voltage range and up to 2A output current.

3.3V and 5V PoE Powered Device

MAXREFDES31 (Pasadena)

This design is an IEEE 802.3af/at compliant. Powered Device (PD). In addition to regulating power received over Ethernet, device can also be powered from a wall adapter.

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Evaluation Kit for the MAX1510

MAX1510EVKIT

Evaluates the Low-Voltage DDR Linear Regulator

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Evaluation Kit for the MAX17651

MAX17651EVKIT

Demonstrates the 60V, 100mA, Ultra-Low Quiescent Current, Linear Regulator

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Full-Bridge DC Motor Driver Mbed Shield

MAXREFDES89

Mbed-compatible, Arduino form-factor shield for brushed DC motor applications. Drives up to 4 motors with current regulation while operating from a single 7V to 36V power supply.

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Evaluation Kit for the MAXM17575 5V Output Application

MAXM17575EVKIT

Integrated power solution providing 5V from a wide input range of 7.5V to 60V with up to 1.5A of current.

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PMIC for Multicore Applications with 13 Regulators, 8 GPIOs, RTC, and Power Sequencer

MAX77714

Complete power management IC for portable devices that use system-on-chip (SoC) application processors.

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Evaluation Kit for 4.5V to 24V, 300mA uSLIC Power Module for 1.5V Output Application

MAXM17903EVKIT

Integrated power solution providing 1.5V from a wide input range of 4.5V to 21.5V with up to 300mA of current.

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40MHz to 4GHz Linear Broadband Amplifier

MAX2615

High-performance broadband amplifier with exceptional gain flatness in an 8-pin TDFN.

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Evaluation Kit for 4V to 60V, 100mA uSLIC Power Module for 5V Output Application

MAXM17552EVKIT

Integrated power solution providing 5V from a wide input range of 14V to 60V with up to 100mA of current.

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18-Bit Precision Data Acquisition System

MAXREFDES74

Performs High-Speed, Precision Data Acquisition with High-Accuracy, Low-Power Data Converters.

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Development Platform for the MAX32625 Arm® Cortex®-M4F MCU

MAX32625PICO

Ultra-low-power with on-board PMIC, 512KB flash, and 160KB SRAM in a tiny 0.6in x 1.0in dual-row header board.

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Heart-Rate and Pulse-Oximetry Monitor

MAXREFDES117

A low power, optical heart-rate module complete with integrated red and IR LEDs, and a power supply.

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DeepCover Embedded Security in IoT Authenticated Sensing and Notification

MAXREFDES143

Demonstrates an authenticated data chain from a protected sensor node to a web server.

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Wearable ECG and Heart Monitor Evaluation and Development Platform

MAX-ECG-MONITOR

The MAX-ECG-MONITOR evaluation and development platform, featuring the MAX30003 clinical-grade AFE, analyzes data and accurately tracks heart signals (ECG and heart rate).

Evaluation Kit for the DS28E38 DeepCover Secure Authenticator

DS28E38

ECDSA asymmetric authentication with ChipDNA PUF protection and 2Kb user EEPROM.

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Peripheral Module for ±5ppm, I2C Real-Time Clock

DS3231MPMB1

Interfaces the DS3231M RTC low-cost and extremely accurate RTC to any system that utilizes Pmod™-compatible expansion ports configurable for I²C.

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Evaluation Kit for Ultra-Low Power PMIC with 3-Output SIMO and Charger

MAX77650

Demonstrates the SIMO buck-boost regulator, linear regulator, analog multiplexer, smart battery charger, on/off controller, and I2C interface.

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Development Platform for the MAX32660 Arm® Cortex®-M4F MCU

MAX32660-EVSYS

Ultra-low power with 256KB flash and 96KB RAM for application and sensor code in a tiny, easy-to-use board.

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Arm® Mbed-Enabled Development Platform for the MAX32625 ARM Cortex®-M4F MCU

MAX32625MBED

Includes prototyping area, Arduino-compatible connectors, 512KB flash, 160KB SRAM, USB interface, and GPIO devices.

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Rapid Development Platform for the MAX32630 Arm® Cortex®-M4F MCU

MAX32630FTHR

Ultra-low-power with on-board PMIC, 2MB flash, 512KB SRAM and peripherals in a tiny dual-row header board.

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Evaluation System for Precision Thermocouple to Digital Converter with Linearization

MAX31856EVSYS

Includes MAX31856PMB1 peripheral module, adaptor board for communication with the software and K-type thermocouple.

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7µA 1-Cell Fuel Gauge with ModelGauge m5 EZ

MAX17055XEVKIT

Combines coulomb counting and voltage fuel gauging for highest SOC accuracy.

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Wearable, Galvanic Skin Response System

MAXREFDES73

GSR measurement detects human skin impedance under different situations.

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Multichannel Integrated Power Management IC

MAX77752

Highly integrated power management for computationally intensive platforms.

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Building Automation Shield

MAXREFDES130

Arduino form-factor, Mbed™-enabled shield, includes 0VDC-10VDC analog outputs, 4–20mA input/output, latching/nonlatching relays, RTC, and 1–Wire master.

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Evaluation Kit for the MAXM17503 in a 5V/2.5A Output Application

MAXM17503EVKIT

Integrated power solution providing 5V from a wide input range of 11V to 60V with up to 2.5A of current.

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Evaluation Kit for 4.5V to 60V, 300mA uSLIC Power Module for 5V Output Application

MAXM15064EVKIT

Integrated power solution providing 5V from a wide input range of 12V to 60V with up to 300mA of current.

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MAXREFDES150: POCKET IO PLC DEVELOPMENT PLATFORM

MAXREFDES150

Industry 4.0, the fourth revolution in manufacturing and process automation, poses a considerable challenge for PLC design engineers who are required to pack more functionality into enclosures that keep getting smaller.

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GPS/GNSS Ultra-Low-Noise-Figure LNA

MAX2667EVKIT

Lowest noise figure GPS LNA delivers high gain and high linearity in a tiny package.

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DeepCover Embedded Security in an IoT: Public-Key Secured Data Paths

MAXREFDES155

Secures IoT systems with a public-key-based authenticated data chain from a protected sensor node to a web server.

Cryptographic Controller for Embedded Devices Development Platform

MAXQ1061 Evaluation Kit - Evaluates: MAXQ1061,MAXQ1061-KIT

Credit card-sized socketed board allows for communication and power through a 10-pin connector to an optional host adapter.

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Evaluation Kit for MAXM17515 in a 1.5V/5A Output Application

MAXM17515EVKIT

Provides 1.5V from a 2.4V to 5.5V input and delivers up to 1.5A at over 91% efficiency.

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Dual-Channel Current Sense Peripheral Module

MAXREFDES77

Interfaces the MAX44285 dual-channel high-side current-sense amplifier to any system that utilizes Pmod™-compatible expansion ports.

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Evaluation Kit for GPS/GNSS Ultra-Low Current LNA

MAX2679BEVKIT

Enables testing of RF performance with no additional circuitry. Provides 50Ω SMA connectors for inputs and outputs.

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Stand-Alone ModelGauge m5 Fuel Gauges with SHA-256 Authentication EZ

MAX17201GEVKIT

Offers nonvolatile memory (NVM) for pack-side, single-cell or multi-cell applications.

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Secure Authentication Design with 1-Wire ECDSA and Xilinx Zynq SoC

MAXREFDES44

Protects IP and authenticates peripherals to Xilinx Zynq™ FPGAs.

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Evaluation Kit for I2C Temp Sensor with ±2°C Accuracy Low-Power I2C Temperature Sensor in WLP Package

MAX31875EVKIT

Includes GUI that provides communication over I2C with an on-board master IC.

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1-Wire Shield

MAXREFDES132

A platform for interfacing with 1-Wire® devices, 1-Wire evaluation kits (EV kits), and iButton® devices.

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MAX44000PMB1: Peripheral Module

MAX44000PMB1

Ambient and Infrared Proximity Sensor Peripheral Module

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Universal Input Micro PLC

MAXREFDES67

Universal analog input accepts analog voltage and current, all RTD configurations and thermocouples to collect high-accuracy analog data using a single architecture.

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Evaluation Kit for the MAX66242 DeepCover Secure Authenticator

MAX66242

Includes ISO 15693, I2C, SHA-256 tag/transponder with 4Kb user EEPROM, RF/I2C interface and energy harvesting.

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1-Wire Grid-Eye Sensor

MAXREFDES131

Sensing solution featuring the Panasonic AMG8833 Grid-EYE® and the Maxim 1-Wire® bus, enabled by the DS28E17.

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Serial Communications Module for Evaluation Kits

DS3900P2EVKIT

Provides bidirectional communication with 2-wire and 3-wire devices using a PC's serial port to evaluate a wide variety of ICs.

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Turnkey PCI-PTS Mobile POS (MPOS) Terminal

MPOS-STD2

A complete mPOS solution, pre-evaluated by security labs for compliance with PCI-PTS 4.0 standards.

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MAX30205 Evaluation System

MAX30205EVKIT

System to evaluate the MAX30205 human body temperature sensor. Includes a USB-to-I2C controller and GUI.

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Development Platform for the MAX32630 Arm Cortex®-M4F MCU

MAX32630-EVKIT

Ultra-low power for wearables with 2MB flash, 512KB SRAM, and peripherals in a small, easy-to-use board.

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4–20mA Loop-Powered Temperature Sensor with Hart

MAXREFDES16

2-wire, loop-powered smart temperature transmitter solution for temperature measurement. Works with any type of RTD, from PT100 to PT1000.

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16-Bit Four-Channel Analog Input Micro PLC Card

MAXREFDES61

Complete Analog Front-End for Next-Gen Ultra-Small PLCs with Isolated Power and Data.

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5.1µA 1-Cell Fuel Gauge with ModelGauge m5 EZ and Optional High-Side Current Sensing

MAX17260XEVKIT

Evaluates the stand-alone ModelGauge™ m5 host-side fuel-gauge ICs for lithium-ion (Li+) batteries in handheld and portable equipment.

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High-Precision, Long-Battery Life Heat/Flow Meter

MAXREFDES70

Low-power, ultrasonic time-of-flight reference design for high-accuracy liquid flow measurement.

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DeepCover Secure Authenticator Demonstration Kit

MAXAUTHDEMO

Hardware/software platform that demonstrates the functional capabilities of Maxim's Secure Authenticators in genuine use-case scenarios.

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Smart Force Sensor

MAXREFDES82

Industrial sensor displays weight and center of mass for objects placed on the platform, up to 780g.

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Evaluation Kit for 4.5V to 42V, 300mA uSLIC Power Module for 3.3V Output

MAXM15462EVKIT

Integrated power solution providing 3.3V from a wide input range of 4.5V to 42V with up to 300mA of current.

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24-Bit Weigh Scale

MAXREFDES75

High-accuracy weigh scale reference design performs small-signal 24-bit measurements, and produces a weighted 0 to 10V output proportional to the input signal.

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Heart-Rate and Activity Monitor Evaluation and Development Platform

MAX-HEALTH-BAND

The MAX-HEALTH-BAND wrist-worn heart-rate and activity monitor provides a simplified means to extract high-accuracy vital signs and raw data from health sensors for wearable designs.

Non-isolated 24V to 5.1V, 20W Power Supply

MAXREFDES125

High-efficiency, 20W power supply for industrial and broad power-supply applications.

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Complete Evaluation Board for Ultra-Low Power Cortex-M4F Microcontroller

MAX32620-EVKIT

Power-optimized Arm® Cortex®-M4F. Optimal peripheral mix provides platform scalability. On-board bluetooth® 4.0 BLE transceiver with chip antenna.

Health Sensor Platform

MAXREFDES100

mbed-enabled sensor platform for rapid evaluation of wearable health and fitness solutions. Measures motion, temperature, biopotential, pulse oximetry, and heart rate.

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3µA 1-Cell/2-Cell Fuel Gauge with ModelGauge

MAX17048EVKIT

Smallest, lowest power fuel gauge with proven, voltage-only ModelGauge algorithm.

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Arm Cortex-M4F Development Platform with Expansion Connectors for Battery-Powered Devices

MAX32620FTHR

Mbed-enabled development platform for the MAX32620 ultra-low-power microcontroller. On-board PMIC, fuel gauge, peripherals, and Pmod™ connectors enable rapid development with a small 0.9in x 2.0in board.

Display Driver Shield

MAXREFDES99

Arduino form-factor shield daisy-chains four MAX7219 LED drivers to drive a 16x16 LED array for signage applications.

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Evaluation Kit for the MAXM17574 5V Output Application

MAXM17574EVKIT

Integrated power solution providing 5V from a wide input range of 10V to 60V with up to 3.0A of current.

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Development Platform for the Ultra-Low Power Microcontroller for Wearables

MAX32630FTHR

Power-optimized Arm® Cortex®-M4F. Optimal Peripheral Mix Provides Platform Scalability. On-Board Bluetooth® 4.0 BLE Transceiver with Chip Antenna.

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Evaluation Kit for the DS28E25 and DS2465 DeepCover Secure Authenticators

DS28E25

SHA-256 bidirectional authentication with 4Kb user EEPROM and 1-Wire interface.

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Evaluation Kit for the MAX44298

MAX44298EVKIT

Assesses the MAX44298 precision power monitor with very low offset for low-side monitoring.

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Evaluation Kit for WPC/PMA Dual Mode Wireless Power Receiver

MAX77950EVKIT

Wireless power receiver that operates using near-field magnetic induction when coupled with a WPC or PMA transmitter and provides output power up to 12 watts.

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Evaluation Kit for the MAXM17761 5V Output-Voltage Application

MAXM17761EVKIT

Integrated power solution providing 5V from a wide input range of 4.5V to 76V with up to 1A of current.

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Evaluation Kit for 4V to 24V, 100mA uSLIC Power Module for 5V Output Application

MAXM17900EVKIT

Integrated power solution providing 5V from a wide input range of 10V to 24V with up to 100mA of current.

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ECT/EPT Current Fault Sensor

MAXREFDES38

High-accuracy analog front-end for ECT/EPT low-power sensors to increase precision of grid health data and fault location.

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Pmod Adapter for Arduino Platform

MAXREFDES72

Arduino to Pmod shield with integrated level-shifting and pin-multiplexing.

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Pocket IO™ PLC Development Platform

MAXREFDES150

Integrates 30 industrial IOs for lower heat dissipation and faster throughput in less than ten cubic inches.

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MAX66242 DeepCover安全认证器评估套件

MAX66242

包括ISO 15693、I2C、SHA-256标签/应答器,带4Kb用户EEPROM、RF/I2C接口和能量收集。

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Isolated Power Supply Reference Design

MAXREFDES9

3.3V to 15V Input, ±15V (±12V) Output Isolated Power for Industrial and Medical Applications

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Evaluation Kit for 4V to 42V, 100mA uSLIC Power Module for 5V Output

MAXM17532EVKIT

Integrated power solution providing 5V from a wide input range of 10V to 42V with up to 100mA of current.

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Evaluation System for Optical Pulse Oximeter and Heart-Rate Sensor

MAX86140EVSYS

Allows flexible configurations to optimize measurement signal quality with minimal power consumption.

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Isolated, 24V to 12V, 20W Power Supply Reference Design

MAXREFDES113

Compact, 24V input, flyback converter module with 12V at 1.6A output and pre-qualified transformers.

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4V to 42V, 100mA, Compact Step-Down Power Module

MAXM17532

The MAXM17532 is a step-down DC-DC power module built in a compact uSLICTM package. The MAXM17532 integrates a controller, MOSFETs, an inductor, as well as the compensation components. The device operates from an input voltage of 4.0V to 42V, supports an adjustable output voltage from 0.9V to 5.5V, and supplies up to 100mA of load current. The high level of integration significantly reduces design complexity, manufacturing risks and offers a true “plug and play” power supply solution, hence reducing the time-to-market.

Non-isolated 5V/2.5A PoE Powered Device Power Supply

MAXREFDES98

This non-isolated PoE powered device design combines a PD controller and buck converter on a 1.2 in2 board. It accepts 36V to 57V input with 5V output up to 2.5A.

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Evaluation Kit for the MAX44284

MAX44284EVKIT

Demonstrates the high-precision real-time current monitoring of the MAX44284 current-sense amplifier.

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4-Port IO-Link Master

MAXREFDES79

4-Port IO-Link Master Reference Design Description: Four IO-Link ports allow for simultaneous testing of four different sensors or actuators.

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Non-isolated 12V/1A PoE Powered Device Power Supply

MAXREFDES108

This non-isolated PoE powered device design combines a PD controller and buck converter on a 1.2 in2 board. It accepts 36V to 57V input with 12V output up to 1A.

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Isolated 24V to 3.3V 33W Power Supply

MAXREFDES121

Isolated, industrial power-supply reference design with an efficient active-clamp topology design with 24V input.

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Evaluation Kit for the MAXM17502 in a 5V/1A Output Application

MAXM17502EVKIT

Provides 5V from a 12V to 60V input and delivers up to 1A at over 84% efficiency.

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Isolated 24V to 5V, 12.5W No-Opto Flyback Power Supply

MAXREFDES120

Compact 24V input module with secondary-side synchronous MOSFET driver that features 5V at 2.5A output.

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