SPT7853

TRIPLE 10-BIT, 30 MSPS A/D CONVERTER

BLOCK DIAGRAM

GENERAL DESCRIPTION

The SPT7853 has three 10-bit analog-to-digital converters

on one CMOS chip, each with a sample rate of 30 MSPS.

This device is ideal for professional-level video decoding to

4:2:2/4:4:4 CCIR-601 standard specifications for compo-

nent digital video, including YCrCb and RGB decoding, pro-

fessional video equipment, video frame grabbers, medical

imaging, flat panel display and projection applications.

The SPT7853 offers significant advantages over discrete

single-channel A/D implementations. Board area, package

count, system cost and power dissipation can greatly be

reduced by using a single SPT7853 device. In addition,

several performance advantages exist, including low chan-

nel-to-channel cross-talk noise and well matched channel-

to-channel gain specifications. The three analog-to-digital

converters are driven from a common 2X sample rate

CMOS clock.

The SPT7853 typically consumes only 580 mW of total

power from a single +5 V supply. Digital outputs can operate

with +3 V or +5 V logic and are tri-state capable. The

SPT7853 is offered in a small 52-pin thin quad flat pack

(TQFP) package and operates over the 0 to +70

°C com-

mercial temperature range.

APPLICATIONS

• CCIR-601 (4:2:2/4:4:4) digital component video

• RGB video decoding

• Medical imaging

• Flat panel displays

• PC projectors

FEATURES

• Three 10-bit, 30 MSPS ADCs on one chip

• Channel-to-channel cross talk: –66 dB typical

• Channel-to-channel gain matching of <0.1 dB

• Single 2X sample rate clock

• Total power dissipation: 580 mW (typical)

• Tri-state +3 V to +5 V digital outputs CMOS-compatible

• Single +5 V power supply

Timing

Generation

Reference

Ladder

T/H

T/H

T/H

10

10

10

DA0–9

Clock

DB0–9

DC0–9

2

2

Output Enable

Output

Buffer

Output

Buffer

Output

Buffer

DAV