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MAX197ACAIT

Multi-Range (±10V, ±5V, +10V, +5V), Single +5V, 12-Bit DAS with 8+4 Bus Interface

Maxim Integrated 

19-0381; Rev 2; 9/01

MEAVNAULAULAATVIOANILKAIBTLE

Multi-Range (±10V, ±5V, +10V, +5V),

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

_______________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 does 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), refer to the MAX199 data sheet. For 12-bit

bus interface, refer to the MAX196 and MAX198 data

sheets.

________________________Applications

Industrial-Control Systems

Robotics

Data-Acquisition Systems

Automatic Testing Systems

Medical Instruments

Telecommunications

Functional Diagram appears at end of data sheet.

____________________________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

______________Ordering Information

PART

MAX197ACNI

TEMP RANGE

0°C to +70°C

PIN-PACKAGE

28 Narrow Plastic DIP

MAX197BCNI 0°C to +70°C 28 Narrow Plastic DIP

MAX197ACWI 0°C to +70°C 28 Wide SO

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*

Ordering Information continued at end of data sheet.

*Dice are specified at TA = +25°C, DC parameters only.

__________________Pin Configuration

TOP VIEW

CLK 1

CS 2

WR 3

RD 4

HBEN 5

SHDN 6

D7 7

D6 8

D5 9

D4 10

D3/D11 11

D2/D10 12

D1/D9 13

D0/D8 14

MAX197

28 DGND

27 VDD

26 REF

25 REFADJ

24 INT

23 CH7

22 CH6

21 CH5

20 CH4

19 CH3

18 CH2

17 CH1

16 CH0

15 AGND

DIP/SO/SSOP/Ceramic SB

________________________________________________________________ Maxim Integrated Products 1

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

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