MAX1421(2001) Просмотр технического описания (PDF) - Maxim Integrated

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MAX1421
(Rev.:2001)

12-Bit, 40Msps, +3.3V, Low-Power ADC with Internal Reference

Maxim Integrated 

19-1900; Rev 0; 5/01

12-Bit, 40Msps, +3.3V, Low-Power ADC

with Internal Reference

General Description

The MAX1421 is a +3.3V, 12-bit analog-to-digital con-

verter (ADC), featuring a fully-differential input,

pipelined, 12-stage ADC architecture with wideband

track-and-hold (T/H) and digital error correction incor-

porating a fully-differential signal path. The MAX1421 is

optimized for low-power, high-dynamic performance

applications in imaging and digital communications.

The converter operates from a single +3.3V supply,

consuming only 188mW while delivering a typical sig-

nal-to-noise ratio (SNR) of 66dB at an input frequency

of 15MHz and a sampling frequency of 40Msps. The

fully-differential input stage has a small signal -3dB

bandwidth of 400MHz and may be operated with sin-

gle-ended inputs.

An internal +2.048V precision bandgap reference sets

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

structure accommodates an internal or externally

applied buffered or unbuffered reference for applica-

tions requiring increased accuracy or a different input

voltage range.

In addition to low operating power, the MAX1421 fea-

tures two power-down modes, a reference power-down

and a shutdown mode. In reference power-down, the

internal bandgap reference is deactivated, resulting in

a typical 2mA supply current reduction. For idle peri-

ods, a full shutdown mode is available to maximize

power savings.

The MAX1421 provides parallel, offset binary, CMOS-

compatible three-state outputs.

The MAX1421 is available in a 7mm x 7mm, 48-pin

TQFP package, and is specified over the commercial

(0°C to +70°C) and the extended industrial (-40°C to

+85°C) temperature ranges.

Pin-compatible higher- and lower-speed versions of the

MAX1421 are also available. Please refer to the

MAX1420 data sheet for a frequency of 60Msps and

the MAX1422 data sheet for a frequency of 20Msps.

________________________Applications

Medical Ultrasound Imaging

CCD Pixel Processing

Data Acquisition

Radar

IF and Baseband Digitization

Features

o Single +3.3V Power Supply

o 67dB SNR at fIN = 5MHz

o 66dB SNR at fIN = 15MHz

o Internal, +2.048V Precision Bandgap Reference

o Differential, Wideband Input T/H Amplifier

o Power-Down Modes

180mW (Reference Shutdown Mode)

10µW (Shutdown Mode)

o Space-Saving 48-Pin TQFP Package

PART

MAX1421CCM

MAX1421ECM

Ordering Information

TEMP. RANGE

0°C to +70°C

-40°C to +85°C

PIN-PACKAGE

48 TQFP

48 TQFP

Pin Configuration

AGND 1

AVDD 2

AVDD 3

AGND 4

AGND 5

INP 6

INN 7

AGND 8

AGND 9

AVDD 10

AVDD 11

AGND 12

MAX1421

36 D9

35 D8

34 D7

33 D6

32 DVDD

31 DVDD

30 DGND

29 DGND

28 D5

27 D4

26 D3

25 D2

Functional Diagram appears at end of data sheet.

48-TQFP

________________________________________________________________ Maxim Integrated Products 1

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.

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