AFE4410 Ultra-Small Integrated AFE With FIFO for Wearable Optical Heart-Rate Monitoring and Biosensing | TI.com

AFE4410 (ACTIVE)

Ultra-Small Integrated AFE With FIFO for Wearable Optical Heart-Rate Monitoring and Biosensing

Ultra-Small Integrated AFE With FIFO for Wearable Optical Heart-Rate Monitoring and Biosensing - AFE4410
 

Recommended alternative parts

  • AFE4405  - The device has SIMILAR FUNCTIONALITY but is not functionally equivalent to the compared device. 

More Information

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

Description

The AFE4410 is an analog front-end for optical biosensing applications, such as heart-rate monitoring (HRM). The device supports up to four switching light-emitting diodes (LEDs) and up to three photodiodes (PDs). 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 is stored in a 128-sample first in, first-out block (FIFO) with programmable depth. The FIFO can be read out using either an I2C interface or a serial peripheral interface (SPI). The AFE also has a fully integrated LED driver with 8-bit current control. The device has high dynamic range transmit-and-receive circuitry offering a dynamic range of up to 100 dB that enables accurate heart-rate sensing. The AFE achieves extremely low current levels by operating an ultralow power (ULP) mode set by using the ENABLE_ULP register bit.


Features

  • Accurate, Continuous Heart-Rate Monitoring:
    • Up to 100-dB Dynamic Range for Accurate Heart-Rate Detection
    • Low Current for Continuous Operation on a Wearable Device With a Typical Value:
      • 30 µA for an LED, 25 µA for the Receiver
  • Transmitter:
    • 4 LEDs in Common Anode Configurations
    • 8-Bit Programmable LED Current to 200 mA
    • Mode to Fire Two LEDs in Parallel
    • Programmable LED On-Time
    • Simultaneous Support of 3 LEDs for Optimized SpO2, HRM, or Multiwavelength HRM
    • Average Current of 30 µA Adequate for a Typical Heart-Rate Monitoring Scenario:
      • 20-mA Setting, 60-µs Pulse Duration,
        25-Hz Sampling Rate
  • Receiver:
    • Supports 3 Time-Multiplexed PD Inputs
    • 24-Bit Representation of Current Input From PD in Two’s-Complement Format
    • Individual DC Offset Subtraction DAC
      (Up to ±127-µA Range) at TIA Input for Each LED, Ambient
    • Digital Ambient Subtraction at ADC Output
    • Transimpedance Gain: 10 kΩ to 2 MΩ
    • Noise Filtering With Programmable Bandwidth
    • Receiver Operates at Approximately 1-µA/Hz Sampling Rate (Example, 25 µA at 25 Hz)
    • Hardware Power-Down Mode: Approximately 0-µA Current
  • Flexible Pulse Sequencing and Timing Control
  • Clocking Via External Clock or Internal Oscillator
  • FIFO With 128-Sample Depth:
    • Programmable Partitioning Across Phases
  • Pin-Selectable I2C, SPI Interface
  • Operating Temperature Range: –20°C to +70°C
  • 2.6-mm × 2.1-mm, 0.4-mm Pitch DSBGA Package
  • Supplies:
    • Tx: 3 V to 5.25 V
    • Rx: 1.8 V to 1.9 V (LDO Bypass),
      2.0 V to 3.6 V (LDO Enabled)
    • IO: 1.7 V to Rx_SUP

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Parametrics Compare all products in Biosensing AFEs

 
# Input Channels
Resolution (Bits)
Interface
Number of LEDs
Features
Operating Temperature Range (C)
Package Group
Package Size: mm2:W x L (PKG)
Approx. Price (US$)
AFE4410 AFE4403 AFE4404 AFE4405 AFE4420 AFE4490 AFE4900
3     1     1     2     4     1     3    
24     22     24     24     24     22     24    
SPI
I2C    
SPI     I2C     I2C
SPI    
I2C     Serial SPI     SPI
I2C    
4     3     3     3     4     2     4    
Optical biosensing     Optical biosensing     Optical biosensing     Optical biosensing     Optical Biosensing     Optical biosensing     Optical biosensing    
-20 to 70     -20 to 70     -20 to 70     -20 to 70     -40 to 85     -40 to 85     -20 to 70    
  DSBGA | 36     DSBGA | 15         VQFN | 40      
  See datasheet (DSBGA)     See datasheet (DSBGA)         40VQFN: 36 mm2: 6 x 6 (VQFN | 40)      
2.65 | 1ku     3.25 | 1ku     2.28 | 1ku     2.50 | 1ku     4.10 | 1ku     7.95 | 1ku     2.75 | 1ku