Rainbow-electronics MAX1421 User Manual download pdf

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

♦ Single +3.3V Power Supply

♦ 67dB SNR at f

= 5MHz

♦ 66dB SNR at f

= 15MHz

♦ Internal, +2.048V Precision Bandgap Reference

♦ Differential, Wideband Input T/H Amplifier

♦ Power-Down Modes

180mW (Reference Shutdown Mode)

10µW (Shutdown Mode)

♦ Space-Saving 48-Pin TQFP Package

MAX1421

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

with Internal Reference

________________________________________________________________ Maxim Integrated Products 1

DGND

AGND

INP

INN

AGND

48-TQFP

MAX1421

AGND

CLK

AGND

DGND

AGND

CML

REFN

REFP

REFIN

AGND

D11

D10

Pin Configuration

19-1900; Rev 0; 5/01

Ordering Information

48 TQFP

PIN-PACKAGETEMP. RANGE

0°C to +70°CMAX1421CCM

PART

Functional Diagram appears at end of data sheet.

48 TQFP-40°C to +85°CMAX1421ECM

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.

1 2 3 4 5 6 ... 16 17

Summary of Contents

Page 1 - Ordering Information

General DescriptionThe MAX1421 is a +3.3V, 12-bit analog-to-digital con-verter (ADC), featuring a fully-differential input,pipelined, 12-stage ADC arc

Page 2 - ELECTRICAL CHARACTERISTICS

MAX142112-Bit, 40Msps, +3.3V, Low-Power ADCwith Internal Reference10 _________________________________________________________________________________

Page 3

MAX142112-Bit, 40Msps, +3.3V, Low-Power ADCwith Internal Reference____________________________________________________________________________________

Page 4

MAX142112-Bit, 40Msps, +3.3V, Low-Power ADCwith Internal Reference12 _________________________________________________________________________________

Page 5 - MAX1421 toc03

MAX142112-Bit, 40Msps, +3.3V, Low-Power ADCwith Internal Reference____________________________________________________________________________________

Page 6

MAX1421error specification of less than 1LSB guarantees nomissing codes.Dynamic Parameter DefinitionsAperture JitterFigure 10 depicts the aperture jit

Page 7

Signal-to-Noise Plus Distortion (SINAD)SINAD is computed by taking the ratio of the RMS sig-nal to all spectral components minus the fundamentaland th

Page 8 - MAX1421 toc23

MAX1421Total Harmonic Distortion (THD)THD is typically the ratio of the RMS sum of the first fourharmonics of the input signal to the fundamental itse

Page 9 - Pin Description

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses arei

Page 10 - Detailed Description

MAX142112-Bit, 40Msps, +3.3V, Low-Power ADCwith Internal Reference2 __________________________________________________________________________________

Page 11 - ( )

MAX142112-Bit, 40Msps, +3.3V, Low-Power ADCwith Internal Reference____________________________________________________________________________________

Page 12 - Applications Information

MAX142112-Bit, 40Msps, +3.3V, Low-Power ADCwith Internal Reference4 __________________________________________________________________________________

Page 13 - Board Layout

MAX142112-Bit, 40Msps, +3.3V, Low-Power ADCwith Internal Reference____________________________________________________________________________________

Page 14 - Dynamic Parameter Definitions

MAX142112-Bit, 40Msps, +3.3V, Low-Power ADCwith Internal Reference6 __________________________________________________________________________________

Page 15

MAX142112-Bit, 40Msps, +3.3V, Low-Power ADCwith Internal ReferenceTypical Operating Characteristics (continued)(VAVDD= VDVDD= +3.3V, AGND = DGND = 0,

Page 16 - Functional Diagram

MAX142112-Bit, 40Msps, +3.3V, Low-Power ADCwith Internal Reference8 __________________________________________________________________________________

Page 17 - Package Information

MAX142112-Bit, 40Msps, +3.3V, Low-Power ADCwith Internal Reference____________________________________________________________________________________

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Rainbow-electronics MAX1421 User Manual

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Summary of Contents

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