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廬

UNDERSTANDING THE DDC112鈥檚 CONTINUOUS

AND NON-CONTINUOUS MODES

By Jim Todsen

This application bulletin provides additional information on

how the DDC112鈥檚 continuous and non-continuous modes

work and how to effectively operate the part in either mode.

It is intended to supplement the information in the DDC112鈥檚

data sheet and therefore skips some of the basic explanations

of operation. For a good introduction to the DDC112, please

refer to the data sheet.

A brief overview of the continuous and non-continuous

modes is given first. Then, the state diagram of the state

machine controlling the modes is shown and discussed.

Timing diagrams follow that illustrate operation in both

modes. Finally, some special considerations are explained.

OVERVIEW

The DDC112 is a dual-channel, dual-integrator analog-to-

digital converter (ADC). Designed for use with current

output sensors such as photodiodes, it integrates the applied

current for a user-controlled integration period, T

INT

. Using

a dual-integrator for each channel allows the input signal to

be continuously integrated, as will be explained below.

When the integration is complete, the outputs of the appro-

priate integrators are multiplexed to a single, 20-bit voltage

ADC which generates the final digital readings. Figure 1

shows a simplified block diagram of the DDC112.

S

A

Side A

Channel 1

S

B

Side B

20-Bit

Digital Word

Voltage

ADC

S

A

Side A

Channel 2

S

B

Side B

FIGURE 1. DDC112 Block Diagram.

漏

1998 Burr-Brown Corporation

AB-131

Printed in U.S.A. May, 1998

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