_______________General Description

The MAX199 multi-range, 12-bit data-acquisition system

(DAS) requires only a single +5V supply for operation,

and converts analog signals up to ±4V at its inputs. This

system provides eight analog input channels that are

independently software programmable for a variety of

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 fault-protected to

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

the conversion result of the selected channel. Other fea-

tures include a 5MHz bandwidth track/hold, 100ksps

throughput rate, internal/external clock, internal/external

acquisition control, 8+4 parallel interface, and operation

with an internal 4.096V or external reference.

A hardware SHDN pin and two programmable power-

down modes (STBYPD, FULLPD) provide low-current

shutdown between conversions. In STBYPD mode, the

reference buffer remains active, eliminating start-up

delays.

The MAX199 employs a standard microprocessor (µP)

interface. Its three-state data I/O interface 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 MAX199 is available in 28-pin DIP, wide SO, SSOP,

and ceramic SB packages.

For a different combination of input ranges (±10V, ±5V,

0V to 10V, 0V to 5V), see the MAX197 data sheet. For 12-

bit bus interfaces, see the MAX196/MAX198 data sheet.

________________________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:

o Internal 4.096V or External Reference

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 Two Power-Down Modes

o Internal or External Clock

Multi-Range (±4V, ±2V, +4V, +2V),

+5V Supply, 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

MAX199

__________________Pin Configuration

Call toll free 1-800-722-8266 for free samples or literature.

19-0401; Rev 0; 6/95

PART

MAX199ACNI

MAX199BCNI

MAX199ACWI

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

MAX199BCWI

0°C to +70°C

28 Wide SO

MAX199ACAI

0°C to +70°C

28 SSOP

MAX199BCAI

0°C to +70°C

28 SSOP

MAX199BC/D

0°C to +70°C

Dice*

Functional Diagram appears at end of data sheet.

Ordering Information continued at end of data sheet.