AFE4403 datasheet(13/85 Pages) TI2

13 / 85 page

LED2

LED2 Ambient, LED3

LED1 Ambient

SLED2

SLED1_amb

SLED1

SLED2_amb

CONVLED2

CONVLED1

CONVLED2_amb

CONVLED1_amb

Buffer

Filter

LED1

I-V Amplifier (TIA)

Offset

Cancellation DAC

2C Interface

INP

INM

6-Bit LED

Current Control

ILED

TX_SUP

TX3

TX2

TX1

Analog-to-Digital

Converter

LDO

RX_SUP

I2C_CLK

I2C_DAT

RESET

ADC_RDY

IO_SUP

4-MHz

Oscillator

CLK

4-MHz Clock

OSC_ENABLE

Timing

Engine

Buffer

GND

Filter

TX_SUP

AFE4404

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SBAS689D – JUNE 2015 – REVISED DECEMBER 2016

Product Folder Links: AFE4404

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8 Detailed Description

8.1 Overview

The AFE has an integrated transmitter and receiver for optical heart-rate monitoring and pulse oximetry

applications. The system is characterized by a parameter termed the pulse repetition frequency (PRF) that

determines the repetition periodicity of a sequence of operations. Every cycle of a PRF results in four 24-bit

digital samples at the output of the AFE, each of which is stored in a separate register.

8.2 Functional Block Diagram

AFE4403 Datasheet(PDF) 13 Page - Texas Instruments

AFE4403 Datasheet(HTML) 13 Page - Texas Instruments

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