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General Description

The MAX1084/MAX1085 10-bit analog-to-digital convert-

ers (ADCs) combine a high-bandwidth track/hold, a serial

interface with high conversion speed, an internal +2.5V

reference, and low power consumption. The MAX1084

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

MAX1085 operates from a single +2.7V to +3.6V supply.

The 3-wire serial interface connects directly to

SPI™/QSPI™/MICROWIRE™ devices without external

logic. The devices use an external serial-interface clock to

perform successive-approximation analog-to-digital con-

versions.

Low power combined with ease of use and small pack-

age size make these converters ideal for remote-sensor

and data-acquisition applications, or for other circuits with

demanding power consumption and space requirements.

The MAX1084/MAX1085 are available in 8-pin SO

packages.

These devices are pin-compatible, higher-speed versions

of the MAX1242/MAX1243; for more information, refer to

the respective data sheets.

Applications

Portable Data Logging

Data Acquisition

Medical Instruments

Battery-Powered Instruments

Pen Digitizers

Process Control

Features

o Single-Supply Operation

+4.5V to +5.5V (MAX1084)

+2.7V to +3.6V (MAX1085)

o 10-Bit Resolution

o 400ksps Sampling Rate (MAX1084)

o Internal Track/Hold

o Internal +2.5V Reference

o Low Power: 2.5mA (400ksps)

o SPI/QSPI/MICROWIRE 3-Wire Serial Interface

o Pin-Compatible, High-Speed Upgrade to

MAX1242/MAX1243

o 8-Pin SO Package

400ksps/300ksps, Single-Supply, Low-Power,

Serial 10-Bit ADCs with Internal Reference

________________________________________________________________ Maxim Integrated Products

1

19-1686; Rev 0; 5/00

PART

MAX1084ACSA

MAX1084BCSA

MAX1084AESA

-40°C to +85°C

0°C to +70°C

0°C to +70°C

TEMP.

RANGE

PIN-

PACKAGE

8 SO

8 SO

8 SO

Pin Configuration

Ordering Information

INL

(LSB)

±1/2

±1

±1/2

MAX1084BESA

MAX1085ACSA

MAX1085BCSA

0°C to +70°C

0°C to +70°C

-40°C to +85°C

8 SO

8 SO

8 SO

±1

±1/2

±1

MAX1085AESA

MAX1085BESA

-40°C to +85°C

-40°C to +85°C

8 SO

8 SO

±1/2

±1

7

AIN

T/H

DOUT

6

1

5

OUTPUT

SHIFT

REGISTER

CONTROL

LOGIC

2.5V

REFERENCE

INT

CLOCK

10-BIT

SAR

8

2

3

REF

4

SHDN

SCLK

CS

MAX1084

MAX1085

GND

Functional Diagram

SPI and QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor Corp.

TOP VIEW

1

2

3

4

8

7

6

5

SCLK

CS

DOUT

GND

REF

SHDN

AIN

SO

MAX1084

MAX1085