SBASAL9 August   2022 AFE4432

PRODUCTION DATA  

  1. 1Features
  2. 2Applications
  3. 3Description
  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
    1. 5.1 Package Option Addendum
    2. 5.2 Tape and Reel Information
    3. 5.3 Mechanical Data

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • YCH|25
Thermal pad, mechanical data (Package|Pins)

3 Description

The AFE4432 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 4 switching light-emitting diodes (LEDs) and up to three photodiodes (PDs). The AFE has two LED drivers each with 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. Up to 12 signal phase sets can be defined, each phase set comprising a combination of LED and Ambient phases. Low noise offset DACs at the receiver inputs can be automatically controlled to cancel DC from Ambient and LED light. The current from the PDs in each phase is converted into voltage by TIAs, filtered, and then digitized using a common ADC. The ADC code can be stored in a 160-sample FIFO block. The FIFO can be read out using a SPI or I2C interface.

Device Information
PART NUMBERPACKAGE(1)BODY SIZE (NOM)
AFE4432DSBGA (25)1.80 mm x 1.92 mm
(1) For all available packages, see the orderable addendum at the end of the data sheet.