1

HI-7159A

A/D Converter

The Intersil HI-7159A is a monolithic A/D converter that uses

a unique dual slope technique which allows it to resolve input

changes as small as 1 part in 200,000 (10

µV) without the use

of critical external components. Its digital autozeroing feature

virtually eliminates zero drift over temperature. The device is

fabricated in Intersil’ proprietary low noise BiMOS process,

resulting in exceptional linearity and noise performance. The

HI-7159A’s resolution can be switched between a high

of 60 conversions per second can be achieved. The HI-7159A

is designed to be easily interfaced with most microprocessors

through either of its three serial and one parallel interface

modes. In the serial modes, any one of four common baud

rates is available.

Features

•

±200,000 Count A/D Converter

• 2V Full Scale Reading With 10

µV Resolution

• Serial or Parallel Interface Modes

• Four Selectable Baud Rates

• Differential Analog Input

• Differential Reference Input

• Digital Autozero

Applications

• Weigh Scales

• Part Counting Scales

• Laboratory Instruments

• Process Control/Monitoring

• Energy Management

• Seismic Monitoring

Ordering Information

PART NUMBER

TEMP.

PACKAGE

PKG.

NO.

HI3-7159A-5

0 to 70

28 Ld PDIP

E28.6

Pinout

HI-7159A

(PDIP)

TOP VIEW

Functional Block Diagram

INT OUT

INT IN

BUF OUT

SEL

P7/BRS1

P6/BRS0

P5/SAD3

P3/SAD1

P1/SMS1

P0/SMS0

CS/SAD4

WR/TXD

RD/RXD

P4/SAD2

P2/SAD0

28

27

26

25

24

23

22

21

20

19

18

17

16

15

1

2

3

4

5

6

7

8

9

10

11

12

13

14

GUARD

GUARD

+

+

+

BUFFER

INTEGRATOR

COMPARATOR

ANALOG SWITCHES

CONTROL

SECTION

AND

LATCHES

ANALOG

STATE

MACHINE

UART

BUS

INTERFACE

UNIT

SEL

8 BIT

BUS

CS

WR

RD

-

-

-

Data Sheet

January 1999

File Number

2936.4

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 321-724-7143