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SPT7852SCU

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

Signal Processing Technologies 

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

• Tri-State, TTL-Compatible Outputs

• Overrange Bit

• Selectable Two’s Complement or Straight Binary Output

APPLICATIONS

• SPT NTSC/PAL Video Chip Set

• 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—that’s 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 is the ADC for the

SPT NTSC/PAL video decoder chip set that includes the

SPT9210 analog video processor and the SPT2110 video

decoder. It also has excellent application in the area of

coherent I/Q demodulation in such applications as QAM

demodulation and TV set-top box converters.

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’s 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

VINA

T/H

ADCA

10

Output

Buffer

Overrange

DA0-9

Reference In

Reference

Ladder

VINB

T/H

ADCB

Clock

Reset

Output

Enable

Timing

Generation

10

Output

Buffer

Overrange

DB0-9

Signal Processing Technologies, Inc.

4755 Forge Road, Colorado Springs, Colorado 80907, USA

Phone: (719) 528-2300 FAX: (719) 528-2370 Website: http://www.spt.com E-Mail: sales@spt.com

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