SPT1175

8-BIT, 20 MSPS CMOS A/D CONVERTER

FEATURES

• 20 MSPS Maximum Conversion Rate

• Internal Sample-and-Hold Function

• 90 mW Power Dissipation

• Internal Voltage Reference

• Single +5.0 V Power Supply

• Three-State TTL-Outputs

• CMOS Compatible Clock

APPLICATIONS

• Video Digitizing

• Image Scanners

• Personal Computer Video

• Medical Ultrasound

• Multimedia

• Digital Television

Data

Latches

and

3-State

Output

Buffer

Error

Correction

Circuit

Latch

Coarse

Sampling

Amplifier

Reference Matrix

Timing

Generator

Latch

Analog

Mux

Fine

Sampling

Amplifier

Fine

Sampling

Amplifier

Encoder

Encoder

DGND

VIN

AGND

AGND

DØ (LSB)

D1

D2

D3

D4

D5

D6

D7 (MSB)

CLK

OE

GENERAL DESCRIPTION

The SPT1175 is a CMOS two-step A/D converter capable of

digitizing full scale analog input signals into 8-bit digital words

at a sample rate of 20 MSPS.

For most applications, no external sample-and-hold or

video driving amplifiers are required due to the device's

narrow aperture time, wide bandwidth, and low input ca-

pacitance.

The SPT1175 operates from a single +5.0 V power supply

and has an internal voltage reference which eliminates the

need for external reference circuitry. All digital inputs are

CMOS compatible and the tri-state outputs are TTL-compat-

ible. The SPT1175 is ideal for most video and image pro-

cessing applications that require low power dissipation and

low cost. The SPT1175 is available in 24-lead plastic SOIC,

plastic DIP, and PLCC packages over the commercial tem-

perature range (0 to +70

°C). It is also available in die form.

BLOCK DIAGRAM