DDC264CKZAW datasheet(10/26 Pages) TI1

Part #	DDC264CKZAW

Description	64-Channel, Current-Input Analog-to-Digital Converter

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Manufacturer	TI1 [Texas Instruments]

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To ADC

IN1

Input

Current

Side A Integrator

Photodiode

Side B Integrator

QGND

DDC264

SBAS368C

– MAY 2006 – REVISED JULY 2011

www.ti.com

THEORY OF OPERATION

General Description

For example, while side A integrates the input signal,

A dual switched integrator input channel for the

the side B outputs are digitized by the onboard ADC.

DDC264 is shown in Figure 19. The DDC264

This integration and A/D conversion process is

contains 64 identical input channels that perform the

controlled by the convert pin, CONV. The results from

function of current-to-voltage integration followed by a

side A and side B of each signal input are stored in a

multiplexed A/D conversion. Each input has two

serial output shift register. The DVALID output goes

integrators so that the current-to-voltage integration

low when the shift register data are ready to be

can be continuous in time. The DDC264 continuously

retrieved.

integrates the input signal by switching integrations

between side A and side B.

Figure 19. Dual Switched Integrator Architecture

10

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