DDC232 datasheet(7/35 Pages) TI2

7 / 35 page

Serial

Interface

DVALID

DCLK

DOUT

DIN

Configuration

and

Control

IN2

IN1

DGND

AGND

IN4

IN3

IN30

IN29

ADC

IN32

IN31

CLK

CONV

DIN_CFG

CLK_CFG

RESET

Dual

Switched

Integrator

Dual

Switched

Integrator

Dual

Switched

Integrator

Dual

Switched

Integrator

Dual

Switched

Integrator

Dual

Switched

Integrator

Dual

Switched

Integrator

Dual

Switched

Integrator

VREF

DVDD

AVDD

0.1 F

ADC

DDC232

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SBAS331D – AUGUST 2004 – REVISED APRIL 2010

THEORY OF OPERATION

GENERAL DESCRIPTION

converters via multiplexers. With the DDC232 in the

The block diagram of the DDC232 is shown in

continuous integration mode, the output of the

Figure 2. The device contains 32 identical input

integrators from one side of the inputs will be digitized

channels

that

perform

the

function

while the other 32 integrators are in the integration

current-to-voltage

integration

followed

mode. This integration and A/D conversion process is

multiplexed A/D conversion. Each input has two

controlled by the system clock, CLK. The results from

integrators so that the current-to-voltage integration

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

can be continuous in time. The output of the 64

serial output shift register. The DVALID output goes

integrators are switched to 16 delta-sigma (

∆Σ)

low when the shift register contains valid data.

Figure 2. DDC232 Block Diagram

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