General Description

The MAX127/MAX128 are multirange, 12-bit data

acquisition systems (DAS) that require only a single

+5V supply for operation, yet accept signals at their

analog inputs that may span above the power-supply

rail and below ground. These systems provide eight

analog input channels that are independently software

programmable for a variety of ranges: ±10V, ±5V, 0 to

switching increases the effective dynamic range to 14

bits and provides the flexibility to interface 4–20mA,

±12V, and ±15V-powered sensors directly to a single

+5V system. In addition, these converters are fault pro-

tected 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,

an 8ksps throughput rate, and the option of an internal

4.096V or external reference.

serial interface that allows communication among multi-

ple devices using SDA and SCL lines.

A hardware shutdown input (SHDN) and two software-

programmable power-down modes (standby and full

power-down) are provided for low-current shutdown

between conversions. In standby mode, the reference-

buffer remains active, eliminating start-up delays.

The MAX127/MAX128 are available in 24-pin DIP or

space-saving 28-pin SSOP packages.

Applications

Industrial Control Systems

Data-Acquisition Systems

Robotics

Automatic Testing

Battery-Powered Instruments

Medical Instruments

Features

o 12-Bit Resolution, 1/2 LSB Linearity

o +5V Single-Supply Operation

o Four Software-Selectable Input Ranges

MAX127: 0 to +10V, 0 to +5V, ±10V, ±5V

o 8 Analog Input Channels

o 8ksps Sampling Rate

o ±16.5V Overvoltage-Tolerant Input Multiplexer

o Internal 4.096V or External Reference

o Two Power-Down Modes

o 24-Pin Narrow DIP or 28-Pin SSOP Packages

EVALUATION

KIT

AVAILABLE

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

For small orders, phone 408-737-7600 ext. 3468.

Multirange, +5V, 12-Bit DAS with

2-Wire Serial Interface

________________________________________________________________

Maxim Integrated Products

1

CH0

CH1

CH2

CH3

CH4

CH5

CH6

CH7

DGND

0.01

µF

µC

4.7

µF

0.1

µF

1k

SHDN

MAX127

MAX128

+5V

ANALOG

INPUTS

SCL

SDA

A0

A1

A2

REF

REFADJ

AGND

SCL

SDA

Typical Operating Circuit

19-4773; Rev 0; 7/98

Ordering Information continued at end of data sheet.

PART

MAX127ACNG

MAX127ACNG

0°C to +70°C

0°C to +70°C

TEMP. RANGE

PIN-PACKAGE

24 Narrow Plastic DIP

24 Narrow Plastic DIP

±1

±1/2

INL

(LSB)

Pin Configurations appear at end of data sheet.

Ordering Information