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General 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 leadoff 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-todigital 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 500kHz 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

-40oC to +85oC temperature range.

Applications

● 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

Benefits and 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 1.1μVP-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

500kHz

● 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