_______________General Description

The MAX132 is a CMOS, 18-bit plus sign, serial-output,

analog-to-digital converter (ADC). Multi-slope integra-

tion provides high-resolution conversions in less time

than standard integrating ADCs, allowing operation up

to 100 conversions per second. Low conversion noise

provides guaranteed operation with ±512mV full-scale

input range (2µV/LSB). A simple 4-wire serial interface

connects easily to all common microprocessors, and

twos-complement output coding simplifies bipolar mea-

surements. Typical supply current is only 60µA and is

reduced to 1µA in sleep mode. Four serially pro-

grammed digital outputs can be used to control an

external multiplexer or programmable-gain amplifier.

The MAX132 comes in 24-pin narrow DIP and wide SO

packages, and is available in commercial and extend-

ed temperature grades.

High resolution, compact size, and low power make this

device ideal for data loggers, weigh scales, data-acqui-

sition systems, and panel meters.

________________________Applications

Remote Data Acquisition

Battery-Powered Instruments

Industrial Process Control

Transducer-Signal Measurement

Pressure, Flow, Temperature, Voltage

Current, Resistance, Weight

____________________________Features

o Low Supply Current:

60µA (Normal Operation)

1µA (Sleep-Mode Operation)

o ±0.006% FSR Accuracy at 16 Conv/sec

o Serial I/O Interface with Programmed Output for

Mux and PGA

o Performs up to 100 Conv/sec

o ±2pA Input Current

o 50Hz/60Hz Rejection

±18-Bit ADC with Serial Interface

________________________________________________________________

Maxim Integrated Products

1

24

23

22

21

20

19

18

17

1

2

3

4

5

6

7

8

V+

BUF OUT

INT OUT

INT IN

SCLK

DOUT

DIN

CS

TOP VIEW

CREF-

CREF+

REF+

REF-

P1

P0

OSC1

OSC2

16

15

14

13

9

10

11

12

AGND

IN LO

IN HI

V-

DGND

EOC

P3

P2

DIP/SO

MAX132

__________________Pin Configuration

MAX132

CREF-

CREF+

CS

602k

SCLK

DOUT

DIN

EOC

P0

P1

P2

P3

-5V

±512mV INPUT

BUF OUT

INT OUT

INT IN

4.7nF

REF+

REF-

AGND

IN LO

IN HI

V-

V+

DGND

OSC2

OSC1

+5V

________________Functional Diagram

Call toll free 1-800-998-8800 for free samples or literature.

19-0009; Rev 2; 8/95

PART

MAX132CNG

MAX132CWG

MAX132C/D

0°C to +70°C

0°C to +70°C

0°C to +70°C

TEMP. RANGE

PIN-PACKAGE

24 Narrow Plastic DIP

24 Wide SO

Dice*

EVALUATION

KIT MANUAL

FOLLOWS

DATA

SHEET

______________Ordering Information

* Contact factory for dice specifications.

** Contact factory for availability and processing to MIL-STD-883.

MAX132ENG

MAX132EWG

MAX132MRG

-55°C to +125°C

-40°C to +85°C

-40°C to +85°C

24 Narrow Plastic DIP

24 Wide SO

24 Narrow CERDIP**