
Biopotential Sensor ICs
Integrated AFE Solutions for Complete ECG and Bioimpedance Recordings

Biopotential Sensor ICs
Integrated AFE Solutions for Complete ECG and Bioimpedance Recordings
Biopotential sensor ICs provide electrocardiogram (ECG) waveforms, heart rate/pacemaker edge detection, and bioimpedance (BioZ) measurements with clinical-grade accuracy (IEC 60601-2-47).
Our biopotential sensors deliver highly integrated analog front-end (AFE) solutions for complete ECG and BioZ recordings while consuming the lowest power. Typical applications include cardiac health monitoring, heart-rate monitoring, arrhythmia detection, stress test applications, and respiration monitoring. Wafer-level packages (WLPs) support small form factors in wearable applications such as medical patches, wrist-worn devices, and chest-strap heart-rate monitors.
Key Features Include:
- Low-power operation for continuous monitoring
- Integrated ECG, bioimpedance, PACE detect and R-R algorithm
- Small-size solutions, with pin-compatible packages
- Clinical-grade measurement (meets IEC60601-2-47)
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Featured Products
MAX86176 Ultra-Low-Power, Optical PPG and Single-Lead ECG AFE
PPG (MAX86176)
- Complete Dual-Channel Optical-Data Acquisition System
- Ultra-Low-Power Operation for Wearable Devices
- Optical Readout Channel < 11μA (typ) at 25fps
- 14.6μs to 117.1μs ADC Integration Time
- Low Shutdown Current < 1μA (typ)
- Signal to Noise Ratio (SNR) up to 110dB with Average (Avg) Mode and Off-Chip Filtering
- Supports Frame Rates from 1fps to 2kfps
- High-Resolution 20-bit Charge-Integrating ADCs
- Low Dark-Current Noise of < 50pARMS
- Excellent Ambient Range and Rejection Capability
- > 100μA Ambient Photodiode Current
- > 90dB Ambient Rejection at 120Hz (Avg > 2)
ECG (MAX86176/MAX30005)
- Clinical-Grade ECG AFE with High-Resolution ADC
- 15.6 ENOB with 0.6μVRMS Noise over 0.05Hz to 40Hz
- Very Low Input-Bias Current (-40°C to +85°C)
- 233fARMS Input-Current Noise (0.05Hz to 40Hz, TA = +25°C)
- Fully Differential Input Structure with CMRR > 110dB at Power-Line Frequencies
- High-Input Impedance > 1GΩ for Extremely Low Common to Differential-Mode Conversion
- High DC-Offset Range of ±1300mV (typ 1.8V) Allows a Wide Variety of Electrodes to be Used
- High AC-Dynamic Range of > 90mVP-P Helps Prevent Saturation in the Presence of Motion
- ECG Biopotential Channel Can Be Used for Some EEG Applications
- Higher-Gain Ranges Available (480V/V, 960V/V)
- Low Input-Referred Voltage and Current Noise Enables Use of Small-Area Dry Electrodes
SYSTEM
- Shutdown Current of 0.5μA (typ)
- 256-Word FIFO for ECG and PPG
- True Synchronous ECG and PPG Data from Dedicated Signal Paths
- Two Fully Configurable Interrupts
- High-Speed SPI Interface or I2C Interface
- Small 2.728mm x 2.708mm WLP Package

MAX30001 Ultra-Low-Power, Single-Channel IntegratedBiopotential (ECG, R-to-R, and Pace Detection)and Bioimpedance (BioZ) AFE
- Can be Used in IEC 60601-2-47:2012 Compliant Systems
- Clinical-Grade ECG AFE with High-Resolution Data Converter
- 15.9 Bits ENOB with 3.1µVPP (typ) Noise for ECG
- 17 Bits ENOB with 1.1µVPP Noise for BioZ
- Better Dry Starts Due to Much Improved Real World CMRR and High Input Impedance
- Fully Differential Input Structure with CMRR > 100dB
- Offers Better Common-Mode to Differential Mode Conversion Due to High Input Impedance
- High Input Impedance > 1GΩ for Extremely Low Common-to-Differential Mode
- Minimum Signal Attenuation at the Input During Dry Start Due to High Electrode Impedance
- High DC Offset Range of ±650mV (1.8V, typ) Allows to Be Used with Wide Variety of Electrodes
- High AC Dynamic Range of 65mVP-P or ECG and 90mVP-P for BioZ Will Help Prevent Saturation in the Presence of Motion/Direct Electrode Hits
- Longer Battery Life Compared to Competing Solutions
- 85µW at 1.1V Supply Voltage for ECG
- 158µW at 1.1V Supply Voltage for BioZ
- Leads-On Interrupt Feature Allows to Keep the µC in Deep Sleep Mode Until Valid Lead Condition is Detected
- Lead-On Detect Current: 0.7µA (typ)
- Built-In Heart Rate Detection with Interrupt Feature Eliminates the Need to Run HR Algorithm on the μController
- Robust R-R Detection in High Motion Environment at Extremely Low Power
- Configurable Interrupts Allows the µC Wake Up Only on Every Heart Beat Reducing the Overall System Power
- High Accuracy Allows for More Physiological Data Extractions
- 32-Word ECG and 8-Word BioZ FIFOs Allows the MCU to Stay Powered Down for 256ms with Full Data Acquisition
- High-Speed SPI Interface
- Shutdown Current of 0.6µA (typ)

MAXM86146 Complete Optical Biosensing Module with Ultra-Low-Power Biometric Sensor Hub
- Complete Biometric Sensor Hub
- Supports Simultaneous Wrist-Based Pulse Heart Rate (WHRM) and Pulse Blood Oxygen Saturation (WSpO2) Measurements
- Integrated MAX86141 Dual-Channel Optical AFE
- Integrated MAX32664C Arm® Cortex®-M4 based MCU
- Two Integrated 3.8mm2 PIN Photodiodes
- Can Operate Independently (Two Channels)
- Can Be Combined to Give a Total Radiant Area of 7.6mm2 for Additional Flexibility
- Excellent SNR Enables Measurements on a Wide Range of Users
- Dynamic Range > 90dB in White Card Loop- Back Test (Sample-to-Sample Variance)
- Dynamic Range Extendable to > 104dB for SpO2 and > 110dB for HRM with Multiple Sample Modes and On-Chip Averaging
- Convenient Solution Enables Faster Time-to-Market
- Ultra-Small 4.5mm x 4.1mm x 0.88mm, 38-Pin OLGA Package Size
- World-Class Algorithm for Wearable Applications
- Supports Multiple Accelerometer Options to Allow Robust Detection and Rejection of Motion Artifacts
- Both Raw and Processed Data are Available
- FIFO Provides Minimal Host Interaction
- Ultra-Low Power for Body Wearable Devices
- AFE Only Requires 10μA Typical at 25sps
- MCU Supports Deep-Sleep Mode, Allowing Device to Sleep Between Measurements.
- Automatic Exposure Control (AEC) Algorithm Adjusts the Optical AFE Settings, Maximizing SNR while Minimizing Power Consumption

MAX86140 Best-in-Class Optical Pulse Oximeter and Heart-Rate Sensor for Wearable Health
- Complete Single-Channel, Optical Data Acquisition System
- Optimized Architecture for Transmissive and Reflective Heart Rate or SpO2 Monitoring
- Low Dark Current Noise of < 50pA RMS (Sample to Sample Variance)
- Lower Effective Dark Current Noise Achievable Through Multiple Sample Modes and On-Chip Averaging
- High-Resolution, 19-bit Charge Integrating ADC
- Three Low-Noise, 8-Bit LED Current DACs
- Excellent Dynamic Range >89dB in White Card Loop-Back Test (Sample-to-Sample Variance)
- Dynamic Range Extendable to >104dB for SpO2 and >110dB for HRM with Multiple Sample Modes and On-Chip Averaging
- Excellent Ambient Range and Rejection Capability
- > 100µA Ambient Photodetector Current
- > 70dB Ambient Rejection at 120Hz
- Ultra-Low-Power Operation for Body Wearable Devices
- Low-Power Operation, Optical Readout Channel <10µA Typical at 25sps
- Short Exposure Integration Period of 14.8µs, 29.4µs, 58.7µs, 117.3µs
- Low Shutdown Current = 0.6µA (typ)
- Rejection of Fast Ambient Transients
- Miniature 2.048 x 1.848mm, 5 x 4 0.4mm Ball Pitch WLP
- -40°C to +85°C Operating Temperature Range

MAXM86161 Single-Supply Integrated Optical Module for HR and SpO2 Measurement
- Complete Single-Channel Optical Data Acquisition System
- Built-In Algorithm Further Enhances Rejection of Fast Ambient Transients
- Optimized Architecture for Reflective Heart Rate and SpO2 Monitoring
- Low Dark Current Noise of < 50pA RMS (Sample-to-Sample Variance)
- Lower Effective Dark Current Noise Achievable through Multiple Sample Modes and On-Chip Averaging
- High-Resolution 19-bit Charge Integrating ADC
- Three Low-Noise 8-Bit LED Current DACs
- Excellent Dynamic Range > 89dB in White Card Loop-Back Test (Sample-to-Sample Variance)
- Excellent Ambient Range and Rejection Capability
- > 100μA Ambient Photodetector Current
- > 70dB Ambient Rejection at 120Hz
- Ultra-Low-Power Operation for Wearable Devices
- Low-Power Operation, Optical Readout Channel < 10μA, Typical at 25sps
- Short Exposure Integration Period of 14.8μs, 29.4μs, 58.7μs, 117.3μs
- Low Shutdown Current = 1.6μA (typ)
- Miniature 2.9mm x 4.3mm x 1.4mm, 14-pin OLGA Package
- -40°C to +85°C Operating Temperature Range

MAX30034 Defibrillation/Surge/ESD Protector
- Low Leakage Defibrillation Protection IC Helps ECG Systems
- Low Capacitance ~ 3pF
- Low Leakage ~ 20pA @ 70°C
- Fast Turn-On < 2ns
- Low On-Voltage 3.9V (typ)
- High Peak Current in Excess of 4A
- Withstands Over 100k Defibrillation Pulses Without Failure
- 0°C to 70°C Temperature Range
- Small, 3mm X 5mm µMAX® Package

MAX30004 Ultra-Low Power, Single-Channel Integrated Biopotential HR Detection AFE
- Heart Rate Detection with Interrupt Feature Eliminates the Need to Extract and Process the ECG Data on the Microcontroller
- Robust R-R Detection in High Motion Environment at Extremely Low Power
- Clinical-Grade Biopotential AFE with High-Resolution Data Converter
- 15.5 Bits Effective Resolution with 5µVP-P Noise
- Better Dry Starts Due to Much Improved Real World CMRR and High Input Impedance
- Fully Differential Input Structure with CMRR > 100dB
- Offers Better Common-Mode to Differential Mode Conversion Due to High Input Impedance
- High Input Impedance > 500MΩ for Extremely Low Common-to-Differential Mode Conversion
- Minimum Signal Attenuation at the Input During Dry Start Due to High Electrode Impedance
- High DC Offset Range of ±650mV (1.8V, typ) Allows to Be Used with Wide Variety of Electrodes
- High AC Dynamic Range of 65mVP-P Will Help the AFE Not Saturate in the Presence of Motion/Direct Electrode Hits
- Longer Battery Life Compared to Competing Solutions
- 85µW at 1.1V Supply Voltage
- Leads-On Interrupt Feature Keeps µC in Deep Sleep Mode with RTC Off Until Valid Lead Condition is Detected
- Lead-On Detect Current: 0.7µA (typ)
- Configurable Interrupts Allows the µC Wake-Up Only on Every Heart Beat Reducing the Overall System Power
- High-Speed SPI Interface
- Shutdown Current of 0.5µA (typ)
MAX86176 Ultra-Low-Power, Optical PPG and Single-Lead ECG AFE
PPG (MAX86176)
- Complete Dual-Channel Optical-Data Acquisition System
- Ultra-Low-Power Operation for Wearable Devices
- Optical Readout Channel < 11μA (typ) at 25fps
- 14.6μs to 117.1μs ADC Integration Time
- Low Shutdown Current < 1μA (typ)
- Signal to Noise Ratio (SNR) up to 110dB with Average (Avg) Mode and Off-Chip Filtering
- Supports Frame Rates from 1fps to 2kfps
- High-Resolution 20-bit Charge-Integrating ADCs
- Low Dark-Current Noise of < 50pARMS
- Excellent Ambient Range and Rejection Capability
- > 100μA Ambient Photodiode Current
- > 90dB Ambient Rejection at 120Hz (Avg > 2)
ECG (MAX86176/MAX30005)
- Clinical-Grade ECG AFE with High-Resolution ADC
- 15.6 ENOB with 0.6μVRMS Noise over 0.05Hz to 40Hz
- Very Low Input-Bias Current (-40°C to +85°C)
- 233fARMS Input-Current Noise (0.05Hz to 40Hz, TA = +25°C)
- Fully Differential Input Structure with CMRR > 110dB at Power-Line Frequencies
- High-Input Impedance > 1GΩ for Extremely Low Common to Differential-Mode Conversion
- High DC-Offset Range of ±1300mV (typ 1.8V) Allows a Wide Variety of Electrodes to be Used
- High AC-Dynamic Range of > 90mVP-P Helps Prevent Saturation in the Presence of Motion
- ECG Biopotential Channel Can Be Used for Some EEG Applications
- Higher-Gain Ranges Available (480V/V, 960V/V)
- Low Input-Referred Voltage and Current Noise Enables Use of Small-Area Dry Electrodes
SYSTEM
- Shutdown Current of 0.5μA (typ)
- 256-Word FIFO for ECG and PPG
- True Synchronous ECG and PPG Data from Dedicated Signal Paths
- Two Fully Configurable Interrupts
- High-Speed SPI Interface or I2C Interface
- Small 2.728mm x 2.708mm WLP Package

MAX30001 Ultra-Low-Power, Single-Channel IntegratedBiopotential (ECG, R-to-R, and Pace Detection)and Bioimpedance (BioZ) AFE
- Can be Used in IEC 60601-2-47:2012 Compliant Systems
- Clinical-Grade ECG AFE with High-Resolution Data Converter
- 15.9 Bits ENOB with 3.1µVPP (typ) Noise for ECG
- 17 Bits ENOB with 1.1µVPP Noise for BioZ
- Better Dry Starts Due to Much Improved Real World CMRR and High Input Impedance
- Fully Differential Input Structure with CMRR > 100dB
- Offers Better Common-Mode to Differential Mode Conversion Due to High Input Impedance
- High Input Impedance > 1GΩ for Extremely Low Common-to-Differential Mode
- Minimum Signal Attenuation at the Input During Dry Start Due to High Electrode Impedance
- High DC Offset Range of ±650mV (1.8V, typ) Allows to Be Used with Wide Variety of Electrodes
- High AC Dynamic Range of 65mVP-P or ECG and 90mVP-P for BioZ Will Help Prevent Saturation in the Presence of Motion/Direct Electrode Hits
- Longer Battery Life Compared to Competing Solutions
- 85µW at 1.1V Supply Voltage for ECG
- 158µW at 1.1V Supply Voltage for BioZ
- Leads-On Interrupt Feature Allows to Keep the µC in Deep Sleep Mode Until Valid Lead Condition is Detected
- Lead-On Detect Current: 0.7µA (typ)
- Built-In Heart Rate Detection with Interrupt Feature Eliminates the Need to Run HR Algorithm on the μController
- Robust R-R Detection in High Motion Environment at Extremely Low Power
- Configurable Interrupts Allows the µC Wake Up Only on Every Heart Beat Reducing the Overall System Power
- High Accuracy Allows for More Physiological Data Extractions
- 32-Word ECG and 8-Word BioZ FIFOs Allows the MCU to Stay Powered Down for 256ms with Full Data Acquisition
- High-Speed SPI Interface
- Shutdown Current of 0.6µA (typ)

MAXM86146 Complete Optical Biosensing Module with Ultra-Low-Power Biometric Sensor Hub
- Complete Biometric Sensor Hub
- Supports Simultaneous Wrist-Based Pulse Heart Rate (WHRM) and Pulse Blood Oxygen Saturation (WSpO2) Measurements
- Integrated MAX86141 Dual-Channel Optical AFE
- Integrated MAX32664C Arm® Cortex®-M4 based MCU
- Two Integrated 3.8mm2 PIN Photodiodes
- Can Operate Independently (Two Channels)
- Can Be Combined to Give a Total Radiant Area of 7.6mm2 for Additional Flexibility
- Excellent SNR Enables Measurements on a Wide Range of Users
- Dynamic Range > 90dB in White Card Loop- Back Test (Sample-to-Sample Variance)
- Dynamic Range Extendable to > 104dB for SpO2 and > 110dB for HRM with Multiple Sample Modes and On-Chip Averaging
- Convenient Solution Enables Faster Time-to-Market
- Ultra-Small 4.5mm x 4.1mm x 0.88mm, 38-Pin OLGA Package Size
- World-Class Algorithm for Wearable Applications
- Supports Multiple Accelerometer Options to Allow Robust Detection and Rejection of Motion Artifacts
- Both Raw and Processed Data are Available
- FIFO Provides Minimal Host Interaction
- Ultra-Low Power for Body Wearable Devices
- AFE Only Requires 10μA Typical at 25sps
- MCU Supports Deep-Sleep Mode, Allowing Device to Sleep Between Measurements.
- Automatic Exposure Control (AEC) Algorithm Adjusts the Optical AFE Settings, Maximizing SNR while Minimizing Power Consumption

MAX86140 Best-in-Class Optical Pulse Oximeter and Heart-Rate Sensor for Wearable Health
- Complete Single-Channel, Optical Data Acquisition System
- Optimized Architecture for Transmissive and Reflective Heart Rate or SpO2 Monitoring
- Low Dark Current Noise of < 50pA RMS (Sample to Sample Variance)
- Lower Effective Dark Current Noise Achievable Through Multiple Sample Modes and On-Chip Averaging
- High-Resolution, 19-bit Charge Integrating ADC
- Three Low-Noise, 8-Bit LED Current DACs
- Excellent Dynamic Range >89dB in White Card Loop-Back Test (Sample-to-Sample Variance)
- Dynamic Range Extendable to >104dB for SpO2 and >110dB for HRM with Multiple Sample Modes and On-Chip Averaging
- Excellent Ambient Range and Rejection Capability
- > 100µA Ambient Photodetector Current
- > 70dB Ambient Rejection at 120Hz
- Ultra-Low-Power Operation for Body Wearable Devices
- Low-Power Operation, Optical Readout Channel <10µA Typical at 25sps
- Short Exposure Integration Period of 14.8µs, 29.4µs, 58.7µs, 117.3µs
- Low Shutdown Current = 0.6µA (typ)
- Rejection of Fast Ambient Transients
- Miniature 2.048 x 1.848mm, 5 x 4 0.4mm Ball Pitch WLP
- -40°C to +85°C Operating Temperature Range

MAXM86161 Single-Supply Integrated Optical Module for HR and SpO2 Measurement
- Complete Single-Channel Optical Data Acquisition System
- Built-In Algorithm Further Enhances Rejection of Fast Ambient Transients
- Optimized Architecture for Reflective Heart Rate and SpO2 Monitoring
- Low Dark Current Noise of < 50pA RMS (Sample-to-Sample Variance)
- Lower Effective Dark Current Noise Achievable through Multiple Sample Modes and On-Chip Averaging
- High-Resolution 19-bit Charge Integrating ADC
- Three Low-Noise 8-Bit LED Current DACs
- Excellent Dynamic Range > 89dB in White Card Loop-Back Test (Sample-to-Sample Variance)
- Excellent Ambient Range and Rejection Capability
- > 100μA Ambient Photodetector Current
- > 70dB Ambient Rejection at 120Hz
- Ultra-Low-Power Operation for Wearable Devices
- Low-Power Operation, Optical Readout Channel < 10μA, Typical at 25sps
- Short Exposure Integration Period of 14.8μs, 29.4μs, 58.7μs, 117.3μs
- Low Shutdown Current = 1.6μA (typ)
- Miniature 2.9mm x 4.3mm x 1.4mm, 14-pin OLGA Package
- -40°C to +85°C Operating Temperature Range

MAX30034 Defibrillation/Surge/ESD Protector
- Low Leakage Defibrillation Protection IC Helps ECG Systems
- Low Capacitance ~ 3pF
- Low Leakage ~ 20pA @ 70°C
- Fast Turn-On < 2ns
- Low On-Voltage 3.9V (typ)
- High Peak Current in Excess of 4A
- Withstands Over 100k Defibrillation Pulses Without Failure
- 0°C to 70°C Temperature Range
- Small, 3mm X 5mm µMAX® Package

MAX30004 Ultra-Low Power, Single-Channel Integrated Biopotential HR Detection AFE
- Heart Rate Detection with Interrupt Feature Eliminates the Need to Extract and Process the ECG Data on the Microcontroller
- Robust R-R Detection in High Motion Environment at Extremely Low Power
- Clinical-Grade Biopotential AFE with High-Resolution Data Converter
- 15.5 Bits Effective Resolution with 5µVP-P Noise
- Better Dry Starts Due to Much Improved Real World CMRR and High Input Impedance
- Fully Differential Input Structure with CMRR > 100dB
- Offers Better Common-Mode to Differential Mode Conversion Due to High Input Impedance
- High Input Impedance > 500MΩ for Extremely Low Common-to-Differential Mode Conversion
- Minimum Signal Attenuation at the Input During Dry Start Due to High Electrode Impedance
- High DC Offset Range of ±650mV (1.8V, typ) Allows to Be Used with Wide Variety of Electrodes
- High AC Dynamic Range of 65mVP-P Will Help the AFE Not Saturate in the Presence of Motion/Direct Electrode Hits
- Longer Battery Life Compared to Competing Solutions
- 85µW at 1.1V Supply Voltage
- Leads-On Interrupt Feature Keeps µC in Deep Sleep Mode with RTC Off Until Valid Lead Condition is Detected
- Lead-On Detect Current: 0.7µA (typ)
- Configurable Interrupts Allows the µC Wake-Up Only on Every Heart Beat Reducing the Overall System Power
- High-Speed SPI Interface
- Shutdown Current of 0.5µA (typ)