TLH9287

December 1994

ADC0819 8-Bit Serial IO AD Converter

with 19-Channel Multiplexer

General Description

The ADC0819 is an 8-Bit successive approximation AD

converter with simultaneous serial IO The serial input con-

trols an analog multiplexer which selects from 19 input

channels or an internal half scale test voltage

An input sample-and-hold is implemented by a capacitive

reference ladder and sampled data comparator This allows

the input signal to vary during the conversion cycle

Separate serial IO and conversion clock inputs are provid-

ed to facilitate the interface to various microprocessors

Features

Y

Separate asynchronous converter clock and serial data

IO clock

Y

19-Channel multiplexer with 5-Bit serial address logic

Y

Built-in sample and hold function

Y

Ratiometric or absolute voltage referencing

Y

No zero or full-scale adjust required

Y

Internally addressable test voltage

Y

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

Y

TTLMOS inputoutput compatible

Y

28-pin molded chip carrier or 28-pin molded DIP

Key Specifications

Y

Resolution

8-Bits

Y

Total unadjusted error

g

Y

Single supply

Y

Low Power

15 mW

Y

Conversion Time

16 ms

Connection Diagrams

Molded Chip Carrier (PCC) Package

TLH9287 – 1

Top View

Order Number ADC0819BCV CCV

See NS Package Number V28A

Dual-In-Line Package

TLH9287 – 20

Top View

Order Number ADC0819BCN CIN

See NS Package Number N28B

Functional Diagram

TLH9287 – 2

C1995 National Semiconductor Corporation

RRD-B30M115Printed in U S A