Rainbow-electronics MAX1425 Manual do Utilizador descarregar pdf (Página 1)

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.

For small orders, phone 1-800-835-8769.

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

♦ Differential Inputs for High Common-Mode

Noise Rejection

♦ Signal-to-Noise Ratio

61dB (at f

= 2MHz)

59.3dB (at f

= 10MHz)

♦ Internal +2.5V Reference

♦ 150MHz Input Bandwidth

♦ Wide ±2V Input Range

♦ Low Power Consumption: 172mW

♦ Separate Digital Supply Input for 3V Logic

Compatibility

♦ Single +5V Supply Operation Possible

MAX1425

10-Bit, 20Msps ADC

________________________________________________________________ Maxim Integrated Products 1

DGND

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 0; 1/00

Pin Configuration

Ordering Information

PART

MAX1425CAI

MAX1425EAI -40°C to +85°C

0°C to +70°C

TEMP. RANGE PIN-PACKAGE

28 SSOP

1 2 3 4 5 6 ... 15 16

10-Bit, 20Msps ADC 1

Resumo do Conteúdo

Página 1 - 10-Bit, 20Msps ADC

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.For small orders, phone 1-800-835-8769.General Descript

Página 2

MAX142510-Bit, 20Msps ADC10 ______________________________________________________________________________________Detailed DescriptionThe MAX1425 uses

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MAX142510-Bit, 20Msps ADC______________________________________________________________________________________ 11and REFN. In this mode, the voltages

Página 4

MAX142510-Bit, 20Msps ADC12 ______________________________________________________________________________________Figure 5. Typical Application Circui

Página 5

MAX142510-Bit, 20Msps ADC______________________________________________________________________________________ 13octal D-latched flip-flop (74ALS374)

Página 6

MAX142510-Bit, 20Msps ADC14 ______________________________________________________________________________________Bypassing and Board LayoutThe MAX142

Página 7

MAX142510-Bit, 20Msps ADC______________________________________________________________________________________ 15SSOP.EPS____________________________

Página 8

MAX142510-Bit, 20Msps ADCMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No cir

Página 9

MAX142510-Bit, 20Msps ADC2 _______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSELECTRICAL C

Página 10

MAX142510-Bit, 20Msps ADC_______________________________________________________________________________________ 3ELECTRICAL CHARACTERISTICS (continue

Página 11

MAX142510-Bit, 20Msps ADC4 _______________________________________________________________________________________ELECTRICAL CHARACTERISTICS (continue

Página 12

MAX142510-Bit, 20Msps ADC_______________________________________________________________________________________ 5ELECTRICAL CHARACTERISTICS (continue

Página 13

020406080SPURIOUS-FREE DYNAMIC RANGE vs. POWER (fIN = 9.984MHz) MAX1425-13INPUT (dB)SFDR (dB)-60 -30-45 -15 0-80-60-40-200TOTAL HARMONIC DISTORTION

Página 14

MAX142510-Bit, 20Msps ADC_______________________________________________________________________________________ 7-80-60-40-200TOTAL HARMONIC DISTORTI

Página 15

MAX142510-Bit, 20Msps ADC8 _______________________________________________________________________________________Typical Operating Characteristics (c

Página 16

MAX142510-Bit, 20Msps ADC_______________________________________________________________________________________ 9Pin DescriptionCommon-Mode Level Pos

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Rainbow-electronics MAX1425 Manual do Utilizador Página 1

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