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廬

RETRIEVING DATA FROM THE DDC112

by Jim Todsen

This application bulletin explains how to retrieve data from

the DDC112. It elaborates on the discussion given in the

DDC112 data sheet and provides additional information to

allow you more flexibility during retrieval. It is assumed

that you have a basic understanding of the DDC112鈥檚

operation. For a good introduction to the DDC112, see the

DDC112鈥檚 data sheet.

There are three main sections to this bulletin. First, the basic

operation of data retrieval is explained for a single DDC112

system. Next, a circuit and timing diagram are discussed that

use additional logic circuits to convert the serial bitstream

from the DDC112 into multi-bit words for parallel readback.

Finally, data retrieval considerations for multiple DDC112

systems are covered.

Sensor

Sensor

DDC112

IN1

ADC

IN2

DCLK

Data Retrieval

Inputs

DXMIT

DIN

IN1 Data

Holding Register

IN1 Data

20 Bits

IN2 Data

20 Bits

DVALID

DOUT

Data Retrieval

Outputs

40-Bit Shift Register

FIGURE 1. Serial Interface Block Diagram.

The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes

no responsibility for the use of this information, and all use of such information shall be entirely at the user鈥檚 own risk. Prices and specifications are subject to change

without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant

any BURR-BROWN product for use in life support devices and/or systems.

漏

1998 Burr-Brown Corporation

AB-136

1

Printed in U.S.A. August, 1998

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