General Description

The MAX1266/MAX1268 low-power, 12-bit analog-to-

digital converters (ADCs) feature a successive-approxi-

mation ADC, automatic power-down, fast wake-up

(2µs), an on-chip clock, +2.5V internal reference, and a

high-speed 12-bit parallel interface. They operate with

a single +5V analog supply.

Power consumption is only 10mW at the maximum sam-

pling rate of 420ksps. Two software-selectable power-

down modes enable the MAX1266/MAX1268 to be shut

down between conversions; accessing the parallel

interface returns them to normal operation. Powering

down between conversions can reduce supply below

10µA at lower sampling rates.

Both devices offer software-configurable analog inputs for

unipolar/bipolar and single-ended/pseudo-differential

operation. In single-ended mode, the MAX1266 has six

input channels and the MAX1268 has two (three input

channels and one input channel, respectively, when in

pseudo-differential mode).

Excellent dynamic performance and low power, com-

bined with ease of use and small package size, make

these converters ideal for battery-powered and data-

acquisition applications or for other circuits with demand-

ing power-consumption and space requirements. The

MAX1266 is offered in a 28-pin QSOP package, while the

MAX1268 is available in a 24-pin QSOP. For pin-compati-

ble +3V, 12-bit versions, see the MAX1265/MAX1267.

Applications

Industrial Control Systems

Data Logging

Energy Management

Patient Monitoring

Data-Acquisition Systems

Touch Screens

Features

o 12-Bit Resolution, ±0.5 LSB Linearity

o Single +5V Operation

o Internal +2.5V Reference

o Software-Configurable Analog Input Multiplexer

6-Channel Single Ended/

3-Channel Pseudo-Differential (MAX1266)

2-Channel Single Ended/

1-Channel Pseudo-Differential (MAX1268)

o Software-Configurable Unipolar/Bipolar

Analog Inputs

o Low Current

2.8mA (420ksps)

1.0mA (100ksps)

400µA (10ksps)

2µA (Shutdown)

o Internal 6MHz Full-Power Bandwidth Track/Hold

o Parallel 12-Bit Interface

o Small Footprint

28-Pin QSOP (MAX1266)

24-Pin QSOP (MAX1268)

420ksps, +5V, 6-/2-Channel, 12-Bit ADCs

with +2.5V Reference and Parallel Interface

________________________________________________________________ Maxim Integrated Products

1

19-2722; Rev 0; 04/03

PART

MAX1266ACEI

MAX1266BCEI

0°C to +70°C

0°C to +70°C

TEMP RANGE

PIN-PACKAGE

28 QSOP

28 QSOP

Ordering Information

Pin Configurations

INL

(LSB)

±0.5

±1

Typical Operating Circuits appear at end of data sheet.

24

23

22

21

20

19

18

17

16

15

14

13

1

2

3

4

5

6

7

8

9

10

11

12

D10

D11

REF

REFADJ

GND

COM

CH0

CH1

CS

CLK

WR

RD

INT

D0

D1

D2

D3

D4

D5

D6

D7

D8

D9

QSOP

TOP VIEW

MAX1268

Pin Configurations continued at end of data sheet.

MAX1266AEEI

-40°C to +85°C

28 QSOP

±0.5

MAX1266BEEI

-40°C to +85°C

28 QSOP

±1

MAX1268ACEG

MAX1268BCEG

MAX1268AEEG

-40°C to +85°C

0°C to +70°C

0°C to +70°C

24 QSOP

24 QSOP

24 QSOP

±0.5

MAX1268BEEG

-40°C to +85°C

24 QSOP

±1

±0.5

±1

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.