SBAS861B August   2017  – July 2019 AFE4900

PRODUCTION DATA.  

  1. 1Features
  2. 2Applications
  3. 3Description
    1.     Simplified Block Diagram
  4. 4Revision History
  5. 5Device and Documentation Support
    1. 5.1 Receiving Notification of Documentation Updates
    2. 5.2 Community Resources
    3. 5.3 Trademarks
    4. 5.4 Electrostatic Discharge Caution
    5. 5.5 Glossary
  6. 6Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • YZ|30
Thermal pad, mechanical data (Package|Pins)
Orderable Information

3 Description

The AFE4900 device is an analog front-end (AFE) for synchronized electrocardiogram (ECG), photoplethysmogram (PPG) signal acquisition. The device can also be used for optical bio-sensing applications, such as heart-rate monitoring (HRM) and saturation of peripheral capillary oxygen (SpO2). The PPG signal chain supports up to four switching light-emitting diodes (LEDs) and up to three photodiodes (PDs). The LEDs can be switched on using a fully integrated LED driver. The current from the photodiode is converted into voltage by the transimpedance amplifier (TIA) and digitized using an analog-to-digital converter (ADC). The ECG signal chain has an instrumentation amplifier (INA) with a programmable gain that interfaces to the same ADC. A right-leg drive (RLD) amplifier set can be used to the bias for the ECG input pins. AC and dc lead-off detect schemes are supported. The ADC codes from the PPG and ECG phases can be stored in a 128-sample first in, first out (FIFO) block and read out using either an I2C or a serial programming interface (SPI) interface.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
AFE4900 DSBGA (30) 2.60 mm × 2.10 mm
  1. For all available packages, see the package option addendum at the end of the datasheet.

SPACE

Simplified Block Diagram

AFE4900 fbd_sbas857.gif