AFE4403 datasheet(24/97 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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24 / 97 page

Device

Digital Control for Ambient-Cancellation DAC

Digital

LED2 Data

ADC Output Rate

PRF Samples per Second

Ambient (LED2)

Data

LED1 Data

Ambient (LED1)

Data

SPI

Block

SPI

Interface

Host Processor

Ambient Estimation Block

Ambient information is available in the host

processor.

The processor can:

* Read ambient data

* Estimate ambient value to

be cancelled

* Set the value to be used by the ambient

cancellation DAC using the SPI of AFE

Front End

(LED2 ± Ambient)

Data

(LED1 ± Ambient)

Data

ADC

AFE4403

SBAS650B – MAY 2014 – REVISED JULY 2014

www.ti.com

Feature Description (continued)

8.3.1.2 Ambient Cancellation Scheme and Second Stage Gain Block

The receiver provides digital samples corresponding to ambient duration. The host processor (external to the

AFE) can use these ambient values to estimate the amount of ambient light leakage. The processor must then

set the value of the ambient cancellation DAC using the SPI, as shown in Figure 39.

Figure 39. Ambient Cancellation Loop (Closed by the Host Processor)

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AFE4403 Datasheet(PDF) 24 Page - Texas Instruments

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