General Description

The MAX12555 is a 3.3V, 14-bit, 95Msps analog-to-digital

converter (ADC) featuring a fully differential wideband

track-and-hold (T/H) input amplifier, driving a low-noise

internal quantizer. The analog input stage accepts single-

ended or differential signals. The MAX12555 is optimized

for high dynamic performance, low power, and small

size. Excellent dynamic performance is maintained from

baseband to input frequencies of 175MHz and beyond,

making the MAX12555 ideal for intermediate-

frequency (IF) sampling applications.

Powered from a single 3.3V supply, the MAX12555 con-

sumes only 497mW while delivering a typical 72.1dB

signal-to-noise ratio (SNR) performance at a 175MHz

input frequency. In addition to low operating power, the

MAX12555 features a 300µW power-down mode to

conserve power during idle periods.

A flexible reference structure allows the MAX12555 to use

the internal 2.048V bandgap reference or accept an

externally applied reference. The reference structure

allows the full-scale analog input range to be adjusted

from ±0.35V to ±1.10V. The MAX12555 provides a com-

mon-mode reference to simplify design and reduce exter-

nal component count in differential analog input circuits.

The MAX12555 supports either a single-ended or differ-

ential input clock. Wide variations in the clock duty

cycle are compensated with the ADC’s internal duty-

cycle equalizer (DCE).

ADC conversion results are available through a 14-bit,

parallel, CMOS-compatible output bus. The digital out-

put format is pin selectable to be either two’s comple-

ment or Gray code. A data-valid indicator eliminates

external components that are normally required for reli-

able digital interfacing. A separate digital power input

accepts a wide 1.7V to 3.6V supply, allowing the

MAX12555 to interface with various logic levels.

The MAX12555 is available in a 6mm x 6mm x 0.8mm,

40-pin thin QFN package with exposed paddle (EP),

and is specified for the extended industrial (-40°C to

+85°C) temperature range.

See the Pin-Compatible Versions table for a complete

family of 14-bit and 12-bit high-speed ADCs.

Applications

IF and Baseband Communication Receivers

Cellular, Point-to-Point Microwave, HFC, WLAN

Medical Imaging Including Positron Emission

Tomography (PET)

Video Imaging

Portable Instrumentation

Low-Power Data Acquisition

Features

♦ Direct IF Sampling Up to 400MHz

♦ Excellent Dynamic Performance

♦ Low Noise Floor: 74.7dBFS

♦ 3.3V Low-Power Operation

465mW (Single-Ended Clock Mode)

497mW (Differential Clock Mode)

300µW (Power-Down Mode)

♦ Fully Differential or Single-Ended Analog Input

♦ Adjustable Full-Scale Analog Input Range

±0.35V to ±1.10V

♦ Common-Mode Reference

♦ CMOS-Compatible Outputs in Two’s Complement

or Gray Code

♦ Data-Valid Indicator Simplifies Digital Interface

♦ Data Out-of-Range Indicator

♦ Miniature, 6mm x 6mm x 0.8mm 40-Pin Thin QFN

Package with Exposed Paddle

♦ Evaluation Kit Available (Order MAX12555EVKIT)

14-Bit, 95Msps, 3.3V ADC

________________________________________________________________ Maxim Integrated Products

1

Ordering Information

19-3447; Rev 0; 10/04

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.

EVALUATION

KIT

AVAILABLE

PART*

PIN-PACKAGE

PKG CODE

MAX12555ETL

40 Thin QFN

T4066-3

MAX12555ETL+

40 Thin QFN

T4066-3

Pin-Compatible Versions

PART

SAMPLING

RATE

(Msps)

RESOLUTION

(BITS)

TARGET

APPLICATION

MAX12555

95

14

IF/Baseband

MAX12554

80

14

IF/Baseband

MAX12553

65

14

IF/Baseband

MAX19538

95

12

IF/Baseband

MAX1209

80

12

IF

MAX1211

65

12

IF

MAX1208

80

12

Baseband

MAX1207

65

12

Baseband

MAX1206

40

12

Baseband

Pin Configuration appears at end of data sheet.

+Denotes lead-free package.

*All devices specified over the -40°C to +85°C operating range.