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SPT7852

DUAL 10-BIT, 20 MSPS, 160 mW A/D CONVERTER

FEATURES

Dual 10-Bit/20 MSPS Analog-to-Digital Converter

Monolithic CMOS

Internal Track-and-Hold

Low Power Dissipation: 160 mW

4 Vp-p Analog Input Range for Each ADC

Single +5 Volt Power Supply

with Option for 3.3 V Digital Outputs

鈥?Tri-State, TTL-Compatible Outputs

鈥?Overrange Bit

鈥?Selectable Two鈥檚 Complement or Straight Binary Output

鈥?/div>

APPLICATIONS

鈥?/div>

Video Set-Top Boxes

Cellular Base Stations

QPSK/QAM RF Demodulation

S-Video Digitizers

Composite Video Digitizers

Portable and Handheld Instrumentation

GENERAL DESCRIPTION

The SPT7852 has two 10-Bit CMOS analog-to-digital con-

verters that can sample data at speeds up to 20 MSPS. It

has excellent low noise performance with a very low typical

power dissipation of only 160 mW鈥攖hat鈥檚 the total power

for

both

converters. The SPT7852 uses a dual configuration

of the proprietary circuit design found in our 10-bit CMOS

single converter family, to achieve its high performance in a

CMOS process.

The SPT7852 is specifically designed for video decoding

applications and is ideal for S-video decoding and decoding

of multiple composite video sources. It also has excellent

application in the area of coherent I/Q demodulation in such

applications as QAM demodulation and TV set-top box con-

verters.

Inputs and outputs are TTL/CMOS-compatible to interface

with TTL/CMOS-logic systems. Output data format is select-

able for either straight binary or two鈥檚 complement. The

SPT7852 is available in a 44L TQFP package in commercial

and industrial temperature ranges. It is also available in die

form. For availability of extended temperature ranges,

please contact the factory.

BLOCK DIAGRAM

MSB

Invert

10

VINA

T/H

ADCA

Output

Buffer

Overrange

DA0-9

Reference In

Reference

Ladder

VINB

T/H

ADCB

10

Output

Buffer

Overrange

DB0-9

Clock

Reset

Output

Enable

Timing

Generation

型號

版本

描述

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