ADC08231 datasheet(2/26 Pages) TI1

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TLH11015

December 1994

ADC08231ADC08234ADC08238 8-Bit 2 ms Serial IO

AD Converters with MUX Reference and TrackHold

General Description

The ADC08231ADC08234ADC08238 are 8-bit succes-

sive approximation AD converters with serial IO and con-

figurable input multiplexers with up to 8 channels The serial

IO is configured to comply with the NSC MICROWIRETM

serial data exchange standard for easy interface to the

COPSTM family of controllers and can easily interface with

standard shift registers or microprocessors

Designed for high-speedlow-power applications the devic-

es are capable of a fast 2 ms conversion when used with a

4 MHz clock

All three devices provide a 25V band-gap derived reference

with guaranteed performance over temperature

A trackhold function allows the analog voltage at the posi-

tive input to vary during the actual AD conversion

The analog inputs can be configured to operate in various

combinations of single-ended differential or pseudo-differ-

ential modes In addition input voltage spans as small as 1V

can be accommodated

Applications

High-speed data acquisition

Digitizing automotive sensors

Process controlmonitoring

Remote sensing in noisy environments

Disk drives

Portable instrumentation

Test systems

Features

Serial digital data link requires few IO pins

Analog input trackhold function

4- or 8-channel input multiplexer options with address

logic

On-chip 25V band-gap reference (g2% over tempera-

ture guaranteed)

No zero or full scale adjustment required

TTLCMOS inputoutput compatible

0V to 5V analog input range with single 5V power

supply

Pin compatible with Industry-Standards ADC083148

Key Specifications

Resolution

8 Bits

Conversion time (fC e 4 MHz)

2 ms (Max)

Power dissipation

20 mW (Max)

Single supply

5 VDC (g5%)

Total unadjusted error

LSB and g1 LSB

Linearity Error (VREF e 25V)

LSB

No missing codes (over temperature)

On-board Reference

25V g15% (Max)

ADC08238 Simplified Block Diagram

TLH11015 – 4

TRI-STATE

is a registered trademark of National Semiconductor Corporation

COPSTM microcontrollers and MICROWIRETM are trademarks of National Semiconductor Corporation

C1995 National Semiconductor Corporation

RRD-B30M75Printed in U S A

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