General Description

The MAX1290/MAX1292 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, byte-wide parallel interface. The devices

operate with a single +5V analog supply and feature a

+2.7V to +5.5V digital supply.

400ksps max sampling rate. Two software-selectable

power-down modes enable the MAX1290/MAX1292 to

be shut down between conversions; accessing the par-

allel interface returns them to normal operation.

Powering down between conversions can cut supply

current to under 10µA at reduced sampling rates.

Both devices offer software-configurable analog inputs

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

tial operation. In single-ended mode, the MAX1290 has

eight input channels and the MAX1292 has four input

channels (four and two input channels, 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 MAX1290/MAX1292 tri-states INT when CS goes

high. Refer to MAX1262/MAX1264 if tri-stating INT is not

desired.

The MAX1290 is available in a 28-pin QSOP package,

while the MAX1292 comes in a 24-pin QSOP. For pin-

compatible +3V, 12-bit versions, refer to the MAX1291/

MAX1293 data sheet.

Applications

Industrial Control Systems

Data Logging

Energy Management

Patient Monitoring

Data-Acquisition Systems

Touchscreens

Features

o 12-Bit Resolution, ±0.5 LSB Linearity

o +5V Single-Supply Operation

o User-Adjustable Logic Level (+2.7V to +5.5V)

o Internal +2.5V Reference

o Software-Configurable Analog Input Multiplexer

8-Channel Single-Ended/

4-Channel Pseudo-Differential (MAX1290)

4-Channel Single-Ended/

2-Channel Pseudo-Differential (MAX1292)

o Software-Configurable Unipolar/Bipolar Analog

Inputs

o Low Current: 2.5mA (400ksps)

1.0mA (100ksps)

400µA (10ksps)

2µA (Shutdown)

o Internal 6MHz Full-Power Bandwidth Track/Hold

o Byte-Wide Parallel (8 + 4) Interface

o Small Footprint: 28-Pin QSOP (MAX1290)

24-Pin QSOP (MAX1292)

400ksps, +5V, 8-/4-Channel, 12-Bit ADCs

with +2.5V Reference and Parallel Interface

________________________________________________________________ Maxim Integrated Products

1

19-1531; Rev 3; 12/02

PART

MAX1290ACEI

0°C to +70°C

TEMP RANGE

PIN-PACKAGE

28 QSOP

Ordering Information

Pin Configurations

±0.5

INL

(LSB)

MAX1290BCEI

0°C to +70°C

±1

28 QSOP

MAX1290BEEI

MAX1290AEEI

-40°C to +85°C

±1

-40°C to +85°C

±0.5

28 QSOP

28 QSOP

Ordering Information continued at end of data sheet.

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

REF

REFADJ

GND

COM

CH0

CH1

CH2

CH3

CS

CLK

WR

RD

INT

D0/D8

D1/D9

D2/D10

D3/D11

D4

D5

D6

D7

HBEN

QSOP

MAX1292

TOP VIEW

Pin Configurations continued at end of data sheet.

EVALUATION

KIT

AVAILABLE

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.