__________________General Description

The MAX1240/MAX1241 low-power, 12-bit analog-to-

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

ages. The MAX1240 operates with a single +2.7V to

+3.6V supply, and the MAX1241 operates with a single

+2.7V to +5.25V supply. Both devices feature a 7.5µs

successive-approximation ADC, a fast track/hold

(1.5µs), an on-chip clock, and a high-speed, 3-wire ser-

ial interface.

73ksps maximum sampling speed. A 2µA shutdown

mode reduces power at slower throughput rates.

The MAX1240 has an internal 2.5V reference, while the

MAX1241 requires an external reference. The MAX1241

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 MAX1240/MAX1241 are available in 8-pin

PDIP and SO packages.

Applications

Battery-Powered Systems

Portable Data Logging

Isolated Data Acquisition

Process Control

Instrumentation

________________________________Features

♦ Single-Supply Operation:

+2.7V to +3.6V (MAX1240)

+2.7V to +5.25V (MAX1241)

♦ 12-Bit Resolution

♦ Internal 2.5V Reference (MAX1240)

♦ Small Footprint: 8-Pin DIP/SO Packages

♦ Low Power: 3.7µW (73ksps, MAX1240)

3mW (73ksps, MAX1241)

66µW (1ksps, MAX1241)

5µW (power-down mode)

♦ Internal Track/Hold

♦ SPI/QSPI/MICROWIRE 3-Wire Serial Interface

♦ Internal Clock

+2.7V, Low-Power,

12-Bit Serial ADCs in 8-Pin SO

________________________________________________________________ Maxim Integrated Products

1

19-1155; Rev 4; 6/10

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

Ordering Information continued at end of data sheet.

TOP VIEW

1

2

3

4

8

7

6

5

SCLK

CS

DOUT

GND

REF

SHDN

AIN

DIP/SO

MAX1240

MAX1241

Pin Configuration

Ordering Information

EVALUATION

KIT

AVAILABLE

Functional Diagram

7

AIN

T/H

DOUT

6

1

OUTPUT

SHIFT

REGISTER

CONTROL

LOGIC

INT

CLOCK

12-BIT

SAR

8

2

3

5

REF

4

SHDN

2.5V REFERENCE

(MAX1240 ONLY)

GND

SCLK

CS

MAX1240

MAX1241

**Future product—contact factory for availability.

/V denotes an automotive qualified part.

+Denotes a lead(Pb)-free/RoHS-compliant package.

PART*

TEMP RANGE

PIN-

PACKAGE

INL

(LSB)

MAX1240ACPA+

0

°C to +70°C

8 PDIP

±1/2

MAX1240BCPA+

0

°C to +70°C

8 PDIP

±1

MAX1240CCPA+

0

°C to +70°C

8 PDIP

±1

MAX1240ACSA+

0

°C to +70°C

8 SO

±1

MAX1240BCSA+

0

°C to +70°C

8 SO

±1/2

MAX1240CCSA+

0

°C to +70°C

8 SO

±1

MAX1240BC/DDD

0

°C to +70°C

Dice*

±1

MAX1240AESA/V+**

-40

°C to +85°C 8 SO

±1/2

MAX1240BESA/V+

-40

°C to +85°C 8 SO

±1

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.