SPT7734

8-BIT, 40 MSPS,175 mW A/D CONVERTER

FEATURES

• Monolithic 40 MSPS Converter

• 175 mW Power Dissipation

• On-Chip Track-and-Hold

• Single +5 V Power Supply

• TTL/CMOS Outputs

• 5 pF Input Capacitance

• Low Cost

• Tri-State Output Buffers

• High ESD Protection: 3,500 V Minimum

• Selectable +3 V or +5 V Logic I/O

APPLICATIONS

• All High-Speed Applications Where

Low Power Dissipation is Required

• Video Imaging

• Medical Imaging

• Radar Receivers

• IR Imaging

• Digital Communications

GENERAL DESCRIPTION

The SPT7734 is a 8-bit monolithic, low cost, ultralow power

analog-to-digital converter capable of minimum word rates

of 40 MSPS. The on-chip track-and-hold function assures

very good dynamic performance without the need for exter-

nal components. The input drive requirements are mini-

mized due to the SPT7734's low input capacitance of only

5 pF.

Power dissipation is extremely low at only 175 mW typical at

40 MSPS with a power supply of +5.0 V. The digital outputs

are +3 V or +5 V, and are user selectable. The SPT7734 has

incorporated proprietary circuit design and CMOS process-

ing technologies to achieve its advanced performance. In-

puts and outputs are TTL/CMOS compatible to interface with

TTL/CMOS logic systems. Output data format is straight

binary.

The SPT7734 is available in 28-lead SOIC and 32-lead small

(7 mm square) TQFP packages over the commercial tem-

perature range.

..

.

9-Bit

SAR

DAC

ADC Section 1

T/H

9

9-Bit

SAR

DAC

ADC Section 16

Auto-

Zero

CMP

Auto-

Zero

CMP

T/H

9

VREF

1:16

Mux

.

.

.

9

9

9

9

9-Bit

16:1

Mux/

Error

Correction

Timing

and

Control

P1

P2

P15

P16

ADC Section 2

ADC Section 15

.

.

.

Reference Ladder

Ref

In

Enable

CLK In

Data

Vali

d

.

.

.

D8 Overrange

D7 (MSB)

D6

D5

D4

D3

D2

D1

DØ (LSB)

BLOCK DIAGRAM