SBASA24 December   2019 AFE44S30

PRODUCTION DATA.  

  1. 1Features
  2. 2Applications
  3. 3Description
    1.     Device Images
      1.      Simplified Schematic
  4. 4Device and Documentation Support
    1. 4.1 Receiving Notification of Documentation Updates
    2. 4.2 Support Resources
    3. 4.3 Trademarks
    4. 4.4 Electrostatic Discharge Caution
    5. 4.5 Glossary
  5. 5Mechanical, Packaging, and Orderable Information

Features

  • Supports signal acquisition of up to 24 phases
  • Flexible allocation of 8 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 8 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
  • SPI 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