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300ksps/400ksps, Single-Supply, 4-Channel,

Serial 12-Bit ADCs with Internal Reference

________________________________________________________________ Maxim Integrated Products

1

16

15

14

13

12

11

10

9

1

2

3

4

5

6

7

8

SCLK

DIN

SSTRB

CS

DOUT

GND

REFADJ

TOP VIEW

MAX1282/

MAX1283

TSSOP

CH0

CH1

COM

CH2

CH3

SHDN

REF

19-1688; Rev 0; 5/00

Typical Operating Circuit appears at end of data sheet.

Pin Configuration

Ordering Information

SPI and QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor Corp.

General Description

The MAX1282/MAX1283 12-bit analog-to-digital convert-

ers (ADCs) combine a 4-channel analog-input multiplexer,

high-bandwidth track/hold (T/H), and serial interface with

high conversion speed and low power consumption. The

MAX1282 operates from a single +4.5V to +5.5V supply;

the MAX1283 operates from a single +2.7V to +3.6V sup-

ply. Both devices’ analog inputs are software configurable

for unipolar/bipolar and single-ended/pseudo-differential

operation.

The 4-wire serial interface connects directly to

SPI™/QSPI™/MICROWIRE™ devices without external

logic. A serial strobe output allows direct connection to

TMS320-family digital signal processors. The MAX1282/

MAX1283 use an external serial-interface clock to perform

successive-approximation analog-to-digital conversions.

The devices feature an internal +2.5V reference and a ref-

erence-buffer amplifier with a ±1.5% voltage-adjustment

also be used.

The MAX1282/MAX1283 provide a hardwired SHDN pin

and four software-selectable power modes (normal opera-

tion, reduced power (REDP), fast power-down (FASTPD),

and full power-down (FULLPD)). These devices can be

programmed to automatically shut down at the end of a

conversion or to operate with reduced power. When using

the power-down modes, accessing the serial interface

automatically powers up the devices, and the quick turn-

on time allows them to be shut down between all conver-

sions.

The MAX1282/MAX1283 are available in 16-pin TSSOP

packages.

Applications

Portable Data Logging

Data Acquisition

Medical Instruments

Battery-Powered Instruments

Pen Digitizers

Process Control

Features

o 4-Channel Single-Ended or 2-Channel

Pseudo-Differential Inputs

o Internal Multiplexer and Track/Hold

o Single-Supply Operation

+4.5V to +5.5V (MAX1282)

+2.7V to +3.6V (MAX1283)

o Internal +2.5V Reference

o 400kHz Sampling Rate (MAX1282)

o Low Power: 2.5mA (400ksps)

1.3mA (REDP)

0.9mA (FASTPD)

2µA (FULLPD)

o SPI/QSPI/MICROWIRE/TMS320-Compatible 4-Wire

Serial Interface

o Software-Configurable Unipolar or Bipolar Inputs

o 16-Pin TSSOP Package

±1

16 TSSOP

0°C to +70°C

MAX1283BCUE

±1

16 TSSOP

-40°C to +85°C

MAX1283BEUE

±1

16 TSSOP

-40°C to +85°C

MAX1282BEUE

INL

(LSB)

PIN-

PACKAGE

TEMP.

RANGE

PART

±1

16 TSSOP

0°C to +70°C

MAX1282BCUE