_______________General Description

The MAX197 multi-range, 12-bit data-acquisition sys-

tem (DAS) requires only a single +5V supply for opera-

tion, yet accepts signals at its analog inputs that may

span both above the power-supply rail and below

ground. This system provides 8 analog input channels

that are independently software programmable for a

variety of ranges: ±10V, ±5V, 0V to +10V, or 0V to +5V.

This increases effective dynamic range to 14 bits, and

provides the user flexibility to interface 4mA-to-20mA,

±12V, and ±15V powered sensors to a single +5V sys-

tem. In addition, the converter is overvoltage tolerant to

±16.5V; a fault condition on any channel will not affect

the conversion result of the selected channel. Other

features include a 5MHz bandwidth track/hold, a

100ksps throughput rate, software-selectable internal or

external clock and acquisition, 8+4 parallel interface,

and an internal 4.096V or an external reference.

A hardware SHDN pin and two programmable power-

down modes (STBYPD, FULLPD) are provided for low-

current shutdown between conversions. In STBYPD

mode, the reference buffer remains active, eliminating

start-up delays.

The MAX197 employs a standard microprocessor (µP)

interface. A three-state data I/O port is configured to

operate with 8-bit data buses, and data-access and

bus-release timing specifications are compatible with

most popular µPs. All logic inputs and outputs are

TTL/CMOS compatible.

The MAX197 is available in 28-pin DIP, wide SO, SSOP,

and ceramic SB packages.

For a different combination of ranges (±4V, ±2V, 0V to

4V, 0V to 2V), see the MAX199 data sheet. For 12-bit bus

interface, see the MAX196 and MAX198 data sheets.

________________________Applications

Industrial-Control Systems

Robotics

Data-Acquisition Systems

Automatic Testing Systems

Medical Instruments

Telecommunications

____________________________Features

o 12-Bit Resolution, 1/2LSB Linearity

o Single +5V Operation

o Software-Selectable Input Ranges:

±10V, ±5V, 0V to 10V, 0V to 5V

o Fault-Protected Input Multiplexer (±16.5V)

o 8 Analog Input Channels

o 6µs Conversion Time, 100ksps Sampling Rate

o Internal or External Acquisition Control

o Internal 4.096V or External Reference

o Two Power-Down Modes

o Internal or External Clock

Multi-Range (±10V, ±5V, +10V, +5V),

Single +5V, 12-Bit DAS with 8+4 Bus Interface

________________________________________________________________

Maxim Integrated Products

1

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

DGND

REF

REFADJ

INT

CH7

AGND

CH6

CH5

CH4

CH3

CH2

CH1

CH0

D0/D8

D1/D9

D2/D10

D3/D11

D4

D5

D6

D7

SHDN

HBEN

RD

WR

CS

CLK

DIP/SO/SSOP/Ceramic SB

TOP VIEW

MAX197

__________________Pin Configuration

19-0381; Rev 1; 6/96

PART

MAX197ACNI

MAX197BCNI

MAX197ACWI

0°C to +70°C

0°C to +70°C

0°C to +70°C

TEMP. RANGE

PIN-PACKAGE

28 Narrow Plastic DIP

28 Narrow Plastic DIP

28 Wide SO

______________Ordering Information

MAX197BCWI

0°C to +70°C

28 Wide SO

MAX197ACAI

0°C to +70°C

28 SSOP

MAX197BCAI

0°C to +70°C

28 SSOP

MAX197BC/D

0°C to +70°C

Dice*

Functional Diagram appears at end of data sheet.

Ordering Information continued at end of data sheet.

EVALUATION

KIT

MANUAL

AVAILABLE

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800