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 MAX1185 is a 3V, dual 10-bit analog-to-digital con-

verter (ADC) featuring fully-differential wideband track-

and-hold (T/H) inputs, driving two pipelined, nine-stage

ADCs. The MAX1185 is optimized for low-power, high

dynamic performance applications in imaging, instru-

mentation, and digital communication applications. This

ADC operates from a single 2.7V to 3.6V supply, con-

suming only 105mW while delivering a typical signal-to-

noise ratio (SNR) of 59.5dB at an input frequency of

7.5MHz and a sampling rate of 20Msps. Digital outputs

A and B are updated alternating on the rising (CHA)

and falling (CHB) edge of the clock. The T/H driven

input stages incorporate 400MHz (-3dB) input ampli-

fiers. The converters may also be operated with single-

ended inputs. In addition to low operating power, the

MAX1185 features a 2.8mA sleep mode as well as a

1µA power-down mode to conserve power during idle

periods.

An internal 2.048V precision bandgap reference sets

the full-scale range of the ADC. A flexible reference

structure allows the use of this internal or an externally

derived reference, if desired for applications requiring

increased accuracy or a different input voltage range.

The MAX1185 features parallel, multiplexed, CMOS-

compatible three-state outputs. The digital output for-

mat can be set to two’s complement or straight offset

binary through a single control pin. The device provides

for a separate output power supply of 1.7V to 3.6V for

flexible interfacing. The MAX1185 is available in a 7mm

x 7mm, 48-pin TQFP package, and is specified for the

extended industrial (-40°C to +85°C) temperature

range.

Pin-compatible, nonmultiplexed. high-speed versions of

the MAX1185 are also available. Please refer to the

MAX1180 data sheet for 105Msps, the MAX1181 data

sheet for 80Msps, the MAX1182 data sheet for 65Msps,

the MAX1183 data sheet for 40Msps, and the MAX1184

data sheet for 20Msps.

Applications

High Resolution Imaging

I/Q Channel Digitization

Multichannel IF Sampling

Instrumentation

Video Application

Ultrasound

Features

o Single 3V Operation

o Excellent Dynamic Performance:

o Low Power:

35mA (Normal Operation)

2.8mA (Sleep Mode)

1µA (Shutdown Mode)

o 0.02dB Gain and 0.25° Phase Matching

o Wide ±1Vp-p Differential Analog Input Voltage

Range

o 400MHz, -3dB Input Bandwidth

o On-Chip 2.048V Precision Bandgap Reference

o Single 10-Bit Bus for Multiplexed, Digital Outputs

o User-Selectable Output Format—Two’s

Complement or Offset Binary

o 48-Pin TQFP Package with Exposed Paddle For

Improved Thermal Dissipation

Dual 10-Bit, 20Msps, 3V, Low-Power ADC with

Internal Reference and Multiplexed Parallel Outputs

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Maxim Integrated Products

1

D1A/B

D0A/B

OGND

OGND

A/B

N.C.

N.C.

N.C.

N.C.

N.C.

COM

GND

INA+

INA-

GND

INB-

INB+

GND

CLK

1

2

3

4

5

6

7

8

9

10

11

12

36

35

34

33

32

31

30

29

28

27

26

25

48 TQFP-EP

MAX1185

NOTE: THE PIN 1 INDICATOR FOR LEAD-FREE

PACKAGES IS REPLACED BY A "+" SIGN.

EP

Pin Configuration

19-2175; Rev 2; 4/10

Ordering Information

PART

TEMP

RANGE

PIN-PACKAGE

MAX1185ECM

-40

°C to +85°C

48 TQFP-EP*

MAX1185ECM+

-40

°C to +85°C

48 TQFP-EP*

MAX1185ECM/V+

-40

°C to +85°C

48 TQFP-EP*

*

EP = Exposed paddle.

+

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

/V denotes an automotive qualified part.

Pin-Compatible Versions table at end of data sheet.