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

__________________General Description

The MAX1242/MAX1243 are low-power, 10-bit analog-

to-digital converters (ADCs) available in 8-pin pack-

ages. They operate with a single +2.7V to +5.25V

supply and feature a 7.5µs successive-approximation

ADC, a fast track/hold (1.5µs), an on-chip clock, and a

high-speed, 3-wire serial interface.

73ksps maximum sampling speed. A 2µA shutdown

mode reduces power at slower throughput rates.

The MAX1242 has an internal 2.5V reference, while the

MAX1243 requires an external reference. The MAX1243

input range includes the positive supply rail. An exter-

nal clock accesses data from the 3-wire interface,

which connects directly to standard microcontroller I/O

ports. The interface is compatible with SPI™, QSPI™,

and Microwire™.

Excellent AC characteristics and very low power com-

bined with ease of use and small package size make

these converters ideal for remote-sensor and data-

acquisition applications, or for other circuits with

demanding power consumption and space require-

ments. The MAX1242/MAX1243 are available in 8-pin

DIP and SO packages.

Applications

Portable Data Logging

Process Control Monitoring

Test Equipment

Temperature Measurement

Isolated Data Acquisition

________________________________Features

o +2.7V to +5.25V Single-Supply Operation

o 10-Bit Resolution

o Internal 2.5V Reference (MAX1242)

o Small Footprint: 8-Pin DIP and SO Packages

o Low Power: 3.7mW (73ksps, MAX1242)

3mW (73ksps, MAX1243)

66µW (1ksps, MAX1243)

5µW (power-down mode)

o Internal Track/Hold

o SPI™/QSPI™/Microwire™ 3-Wire Serial Interface

o Pin-Compatible 12-Bit Upgrades:

MAX1240/MAX1241

+2.7V to +5.25V, Low-Power, 10-Bit

Serial ADCs in SO-8

________________________________________________________________

Maxim Integrated Products

1

19-1156; Rev 2; 6/98

SPI and QSPI are trademarks of Motorola, Inc. Microwire is a trademark of National Semiconductor Corp.

Ordering Information continued at end of data sheet.

Note:

Order the MAX1242A in place of the MAX1242C. Order the

MAX1242B in place of the MAX1242D.

________________Functional Diagram

7

AIN

T/H

DOUT

6

1

5

OUTPUT

SHIFT

REGISTER

CONTROL

LOGIC

2.5V

REFERENCE

MAX1242 ONLY

INT

CLOCK

10-BIT

SAR

8

2

3

REF

4

SHDN

SCLK

CS

MAX1242

MAX1243

GND

TOP VIEW

1

2

3

4

8

7

6

5

SCLK

CS

DOUT

GND

REF

SHDN

AIN

DIP/SO

MAX1242

MAX1243

Pin Configuration

_________________Ordering Information

±1

8 Plastic DIP

-40°C to +85°C

MAX1242BEPA

8 Plastic DIP

-40°C to +85°C

MAX1242AEPA

8 SO

0°C to +70°C

MAX1242ACSA

±1

±1

INL

(LSB)

8 SO

8 Plastic DIP

8 Plastic DIP

PIN-

PACKAGE

TEMP. RANGE

0°C to +70°C

0°C to +70°C

0°C to +70°C

MAX1242BCSA

MAX1242BCPA

MAX1242ACPA

PART