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.

General Description

The MAX1425 10-bit, monolithic analog-to-digital con-

verter (ADC) is capable of a 20Msps sampling rate. This

device features an internal track-and-hold (T/H) amplifier

for excellent dynamic performance; at the same time, it

minimizes the number of external components. Low

input capacitance of only 8pF minimizes input drive

requirements. A wide input bandwidth (up to 150MHz)

makes this device suitable for digital RF/IF downconvert-

er applications employing undersampling techniques.

The MAX1425 employs a differential pipelined architec-

ture with a wideband T/H amplifier to maximize through-

put while limiting power consumption to only 172mW.

The MAX1425 generates an internal +2.5V reference

that supplies three additional reference voltages

(+3.25V, +2.25V, and +1.25V). These reference volt-

ages provide a differential input range of +2V to -2V.

The analog inputs are biased internally to correct the

DC level, eliminating the need for external biasing on

AC-coupled applications.

A separate +3V digital logic supply input allows for

separation of digital and analog circuitry. The output

data is in two’s complement format. The MAX1425 is

available in the space-saving 28-pin SSOP package.

For a pin-compatible version at a lower data rate, refer

to the MAX1426 data sheet. For a higher data rate, refer

to the MAX1424 data sheet.

Applications

Medical Ultrasound Imaging

CCD Pixel Processing

IR Focal Plane Array

Radar

IF and Baseband Digitization

Set-Top Boxes

Features

o Differential Inputs for High Common-Mode

Noise Rejection

o Signal-to-Noise Ratio

o Internal +2.5V Reference

o 150MHz Input Bandwidth

o Wide ±2V Input Range

o Low Power Consumption: 172mW

o Separate Digital Supply Input for 3V Logic

Compatibility

o Single +5V Supply Operation Possible

10-Bit, 20Msps ADC

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Maxim Integrated Products

1

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

D0

+

D1

D2

D3

D4

DGND

D9

DGND

D5

D6

D7

D8

OE/PD

CLK

CMLN

CMLP

INN

INP

AGND

CML

REFN

REFIN

REFP

AGND

SSOP

TOP VIEW

MAX1425

CLK

INP

INTERFACE

PIPELINE ADC

REF SYSTEM +

BIAS

OUTPUT

DRIVERS

REF

REFIN REFP

CML REFN

OE/PD

AGND

DGND

D9–D0

INN

T/H

MAX1425

Functional Diagram

19-1597; Rev 1; 7/11

Pin Configuration

Ordering Information

PART

MAX1425CAI+

MAX1425EAI+

-40°C to +85°C

0°C to +70°C

TEMP. RANGE

PIN-PACKAGE

28 SSOP

28 SSOP

+

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

Devices are also available in a tape-and-reel packaging.

Specify tape and reel by adding “T” to the number when order-

ing.