AFE4403 datasheet(27/97 Pages) TI

Part #	AFE4403

Description	AFE4403 Ultra-Small, Integrated Analog Front-End for Heart Rate Monitors and Low-Cost Pulse Oximeters

PDF	97 Pages

Scroll/Zoom	100%

Manufacturer	TI [Texas Instruments]

Direct Link	http://www.ti.com

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27 / 97 page

Photo-diode current

I-V output pulses

Ambient level

(dark level)

SR,

Sample Red

SR_amb,

Sample Ambient

(red phase)

SIR,

Sample IR

SIR_amb,

Sample Ambient

(IR phase)

Plethysmograph signal

N+2

N+1

xxx

Sample phase ± input current is converted to an analog voltage.

Sample phase width is variable from 0 to 25% duty cycle

Convert phase ± sampled analog voltage is converted to a digital code

xxx

IR LED

ON signal

xxx

Red LED

ON signal

Pulse repetition period T = 1/PRF

TCONV

TLED LED ON time

<= 0.25T

Rx sample time

= TLED ± settle time

CONVIR_amb,

Convert ambient sample

(IR phase)

CONVR,

Convert red sample

CONVR_amb,

Convert ambient sample

(red phase)

CONVIR,

Convert IR sample

ADC Conversion

AFE4403

www.ti.com

SBAS650B – MAY 2014 – REVISED JULY 2014

NOTE: Relationship to the AFE4403 EVM is: LED1 = IR and LED2 = RED.

Figure 41. Rx Timing Diagram

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AFE4403 Datasheet(PDF) 27 Page - Texas Instruments

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