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Low-Power, High-Performance Bioimpedance Analog Front-End

Bioimpedance (BIOZ) Analog Front-End Solution to Measure a Range of Physiological Conditions in Wearable Applications.

Product Details

Key Features

Parametric specs for Bio-Sensors
Integrated LEDs none
ISUPPLY (µA) (typ) not applicable
Shutdown Mode Supply Current (µA) (typ) 0.6
VSUPPLY (V) (min) 1.1
VSUPPLY (V) (max) 3.6
Resolution (bits) (ADC) 20
Oper. Temp. (°C) -40 to +85
Package/Pins THIN WLP/25
Budgetary
Price (See Notes)
5.26
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Simplified Block Diagram

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Parameters

Parametric specs for Bio-Sensors
Integrated LEDs none
ISUPPLY (µA) (typ) not applicable
Shutdown Mode Supply Current (µA) (typ) 0.6
VSUPPLY (V) (min) 1.1
VSUPPLY (V) (max) 3.6
Resolution (bits) (ADC) 20
Oper. Temp. (°C) -40 to +85
Package/Pins THIN WLP/25
Budgetary
Price (See Notes)
5.26

Key Features

  • BIOZ
    • Complete High-Performance BioZ AFE
    • Simultaneous I and Q Measurement Capability
    • Four-Electrode (Tetrapolar) and Two-Electrode (Bipolar) Configurations
    • Ultra-Low Power Operation
      • 250 µW at 1.8V AVDD
    • High-Resolution, 20-Bit Sigma Delta Analog-to-Digital Converters (ADCs)
    • Wide Range of Sample Rates from 16sps to 4ksps
    • Flexible and Programmable Input/Output MUX
    • Low-Noise, High-Resolution Receive Channel
      • 17 Bits Effective Resolution with 1.1ΩVP-P Noise
    • High Input Impedance > 1GΩ for Extremely Low Common to Differential-Mode Conversion
    • Programmable Sine-Wave Stimulus
    • Low Frequency, Low Current Options for Galvanic Skin Response (GSR)/Electrodermal Activity (EDA) Starting from 16Hz and 16nARMS
    • Wide Range of Bioelectrical Impedance Analysis/Spectroscopy (BIA/BIS) Frequencies from 1kHz to 806kHz
    • High Currents at High Frequencies for Impedance Cardiography (ICG) Applications (e.g.,1.28mARMS at 100kHz) with Lockout for Lower Frequencies for Conformance with 60601-1
    • High Input AC Dynamic Range of >1000mVP-P
    • 4-Pin In-Situ Calibration Port (4-Wire Precision Resistor) Enables High-Quality Absolute Impedance Measurements
    • DC Leads-Off Detect Capability
    • Ultra-Low Power Lead-On Detection with Interrupt for System Wake-Up
      • Lead-On Detect Current: 0.7µA (typ)
  • SYSTEM
    • Shutdown Current of 0.6µA (Typ)
    • 256 Word FIFO
    • Flexible PLL-Based Timing Subsystem with Internal or External Clock Source
    • PLL can be Synchronized with Adjacent Biosensor AFEs (such as the MAX86176 Photoplethsymography (PPG)/Electrocardiography (ECG) AFE)
    • Configurable Interrupts Reduce µC Wake-Up Time and Save Power
    • High-Speed Serial Peripheral Interface (SPI) and I2C Digital Interface

Applications/Uses

  • Wearable Fitness, Wellness, and Medical Devices
  • Multifrequency Body Composition Analyzers
  • Non-Invasive Hemodynamic Monitors
  • Automatic External Defibrillators
  • Optimized Performance to Accurately Detect:
  • Respiration Rate
  • Galvanic Skin Response/Electrodermal Activity
  • Bioimpedance Spectroscopy
  • Body Composition and Fluid Analysis
  • Impedance Cardiography and Plethysmography

Description

The MAX30009 is a complete Bioimpedance (BioZ) Analog Front-End (AFE) solution for wearable applications. It offers high performance for fitness, wellness, and clinical applications, and ultra-low power for long battery life. The BioZ receive channel has Electrostatic Discharge (ESD) protection, Electromagnetic Interference (EMI) filtering, internal lead-biasing, DC leads-off detection, DRVN lead-off detection, and ultra-low power lead-on detection during standby mode. The BioZ receive channel also has high input impedance, low noise, high Common-Mode Rejection Ratio (CMRR), programmable gain, various low-pass and high-pass filter options, and two high resolution analog-to-digital converters for simultaneous I and Q acquisition.

The BioZ transmit channel has a sine-wave current generator to drive AC currents into the body with a wide frequency range of 16Hz to 806kHz and a wide magnitude range of 16nARMS to 1.28mARMS. The transmit channel can also operate in the sine-wave voltage and H-bridge modes. The flexible input/output MUX allows for both bipolar and tetrapolar measurements with multiple sets of electrodes.

For measurements requiring high absolute impedance accuracy such as Bioimpedance Analysis/Spectroscopy (BIA/BIS) and Automated External Defibrillator (AED) body impedance, the MAX30009 offers several calibration options. An external precision resistor can be connected to the four-wire calibration port for the highest accuracy. Internal trimmed resistors also provide high accuracy.

The PLL-based timing subsystem allows for a wide range of fine-tuned stimulus and sampling frequencies, and can be synchronized with other Analog Devices biosensors for simultaneous data collection.

The MAX30009 is available in a 2.03mm x 2.03mm, 25-bump Wafer-Level Package (WLP), operating over the -40°C to +85°C temperature range.

Simplified Block Diagram

MAX30009: Simplified Block Diagram MAX30009: Simplified Block Diagram Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .