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Product details

Parameters

Type Integrated Photoplethysmography (PPG) Number of input channels 4 Resolution (Bits) 24 Number of LEDs 6 Operating temperature range (C) -40 to 85 Interface type I2C open-in-new Find other Biosensing AFEs

Features

  • Supports signal acquisition of up to 24 phases
  • Flexible allocation of 6 LED, 4 PD in each phase
  • Simultaneous signal acquisition from different sensors at different data rates
  • Accurate, continuous heart-rate monitoring:
    • System SNR up to 108-dB at 16 µA PD current
    • Low current for continuous operation on a wearable device with a typical value: 15 µA for an LED, 20 µA for the receiver
  • Transmitter:
    • Supports common anode LED configuration
    • 8-Bit programmable LED current with range adjustable from 25 mA to 250 mA
    • Mode to fire two LEDs in parallel with independent per-phase current control
    • Programmable LED on-time per-phase
    • Simultaneous support of 6 LEDs for SpO2, HRM, or multi-wavelength HRM
  • Receiver:
    • Supports 4 time-multiplexed photodiode inputs
    • 2 parallel receivers (two sets of TIA/filter)
    • Individual ambient offset subtraction DAC at each TIA Input with 8-bit per-phase control and range adjustable up to 255-µA
    • Individual LED offset subtraction DAC at each TIA input with 5-bit per-phase control and 15.5-µA range
    • Close to 100 dB ambient rejection up to 10 Hz
    • Noise filtering with programmable bandwidth
    • Transimpedance Gain: 3.7 kΩ to 1 MΩ
  • Supports external clock and internal oscillator modes
  • Option to acquire data synchronized with a system master clock
  • Automatic cancellation of DC from ambient, LED
  • FIFO with 128-sample depth
  • I2C interface
  • 2.6-mm × 2.1-mm DSBGA, 0.4-mm pitch
  • Supplies: Rx: 1.7 V-1.9 V (LDO bypass); 1.9 V-3.6 V (LDO enabled), Tx: 3 V-5.5 V, IO: 1.7-3.6 V

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Description

The AFE44I30 is an analog front-end for optical bio-sensing applications, such as heart-rate monitoring (HRM) and saturation of peripheral capillary oxygen (SpO2). The device supports up to six switching light-emitting diodes (LEDs) and up to four photodiodes. Up to 24 signal phases can be defined and the signal can be acquired from each phase in a synchronized manner. The current from the photodiode is converted into voltage by the transimpedance amplifier (TIA) and digitized using an analog-to-digital converter (ADC). The ADC code can be stored in a 128-sample First in, First out (FIFO) block. The FIFO can be read out using a I2C interface. The AFE also has a fully-integrated LED driver with an 8-bit current control. The device has a high dynamic range transmit-and-receive circuitry that helps with the sensing of very small signal levels.

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More information

Full data sheet and other design resources are available under NDA. Request now

Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 5
Type Title Date
* Datasheet AFE44I30 Ultra-Small, Integrated AFE With FIFO for Multi-Sensor Wearable, Optical Heart-Rate Monitoring and Bio-sensing datasheet Feb. 03, 2020
Technical articles Offset correction improves the next generation of heart-rate smart watches Aug. 24, 2015
Technical articles A new way to illuminate the human condition Dec. 30, 2013
Technical articles Oximeter signaling: There’s more than meets the eye Dec. 04, 2013
Technical articles Virtual hospital implementation using a worn health monitor Nov. 13, 2013

Design & development

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Hardware development

EVALUATION BOARDS Download
499
Description

The AFE44I30 evaluation module (EVM) is a platform for expediting and evaluating system-development activities related to the AFE44I30 product. AFE44I30 is an analog front end (AFE) for optical biosensing applications, such as heart-rate monitoring (HRM) and saturation of peripheral capillary oxygen (...)

Features
  • Acquire data at up to 1000 SPS in evaluation mode
  • USB-based power and PC application connectivity
  • Access to all AFE44I30 registers
  • USB-based firmware upgrade option

Design tools & simulation

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PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)

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