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General Description

The MAX1295/MAX1297 low-power, 12-bit analog-to-

digital converters (ADCs) feature a successive-approxi-

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

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

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

a single +2.7V to +3.6V analog supply.

Power consumption is only 5.4mW at the maximum

sampling rate of 265ksps. Two software-selectable

power-down modes enable the MAX1295/MAX1297 to

be shut down between conversions; accessing the par-

allel interface returns them to normal operation.

Powering down between conversions can reduce sup-

ply current below 10µA at lower sampling rates.

Both devices offer software-configurable analog inputs

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

tial operation. In single-ended mode, the MAX1295 has

six input channels and the MAX1297 has two (three

input channels and one input channel, respectively,

when in pseudo-differential mode).

Excellent dynamic performance and low power combined

with ease of use and small package size make these con-

verters ideal for battery-powered and data-acquisition

applications or for other circuits with demanding power-

consumption and space requirements. The MAX1295 is

offered in a 28-pin QSOP package, while the MAX1297

comes in a 24-pin QSOP. For pin-compatible +5V, 12-bit

versions, refer to the MAX1294/MAX1296 data sheet.

Applications

Industrial Control Systems

Data Logging

Energy Management

Patient Monitoring

Data-Acquisition Systems

Touchscreens

Features

o 12-Bit Resolution, ±0.5LSB Linearity

o +3V Single-Supply Operation

o Internal +2.5V Reference

o Software-Configurable Analog Input Multiplexer

6-Channel Single-Ended/

3-Channel Pseudo-Differential (MAX1295)

2-Channel Single-Ended/

1-Channel Pseudo-Differential (MAX1297)

o Software-Configurable Unipolar/Bipolar

Analog Inputs

o Low Current

1.8mA (265ksps)

1.0mA (100ksps)

400µA (10ksps)

2µA (shutdown)

o Internal 3MHz Full-Power Bandwidth Track/Hold

o Parallel 12-Bit Interface

o Small Footprint

28-Pin QSOP (MAX1295)

24-Pin QSOP (MAX1297)

265ksps, +3V, 6-/2-Channel, 12-Bit ADCs

with +2.5V Reference and Parallel Interface

________________________________________________________________

Maxim Integrated Products

1

19-1530; Rev 0; 9/99

EVALUATION

KIT

AVAILABLE

28 QSOP

±1

0°C to +70°C

MAX1295BCEI

INL

(LSB)

±0.5

28 QSOP

PIN-PACKAGE

TEMP. RANGE

0°C to +70°C

MAX1295ACEI

PART

Ordering Information

Pin Configurations

Typical Operating Circuits appear at end of data sheet.

28

27

26

25

24

23

22

21

20

19

18

17

16

15

1

2

3

4

5

6

7

8

9

10

11

12

13

14

D10

D11

REF

REFADJ

GND

CS

COM

CH0

CH1

CH2

CH3

CH4

CH5

CLK

WR

RD

INT

D0

D1

D2

D3

D4

D5

D6

D7

D8

D9

QSOP

TOP VIEW

MAX1295

Pin Configurations continued at end of data sheet.

28 QSOP

±0.5

-40°C to +85°C

MAX1295AEEI

28 QSOP

±1

-40°C to +85°C

MAX1295BEEI

24 QSOP

±0.5

-40°C to +85°C

MAX1297AEEG

24 QSOP

±1

-40°C to +85°C

MAX1297BEEG

24 QSOP

±1

0°C to +70°C

MAX1297BCEG

±0.5

24 QSOP

0°C to +70°C

MAX1297ACEG