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SPT7835

10-BIT, 5 MSPS, 75 mW A/D CONVERTER

Signal Processing Technologies 

FEATURES

• Monolithic 5 MSPS converter

• 75 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

SPT7835

10-BIT, 5 MSPS, 75 mW A/D CONVERTER

TECHNICAL DATA

JUNE 27, 2001

APPLICATIONS

• All high-speed applications where low power

dissipation is required

• Video imaging

• Medical imaging

• IR imaging

• Scanners

• Digital communications

GENERAL DESCRIPTION

The SPT7835 is a 10-bit monolithic, low-cost, ultralow-

power analog-to-digital converter capable of minimum

word rates of 5 MSPS. The on-chip track-and-hold func-

tion assures very good dynamic performance without the

need for external components. The input drive require-

ments are minimized due to the SPT7835’s low input

capacitance of only 5 pF.

Power dissipation is extremely low at only 75 mW typical

at 5 MSPS with a power supply of +5.0 V. The digital out-

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

SPT7835 is pin-compatible with the entire family of SPT

10-bit, CMOS converters (SPT7835/40/50/55/60/61),

which simplifies upgrades. The SPT7835 has incorpo-

rated proprietary circuit design* and CMOS processing

technologies to achieve its advanced performance. Inputs

and outputs are TTL/CMOS-compatible to interface with

TTL/CMOS logic systems. Output data format is straight

binary.

TThe SPT7835 is available in a 28-lead SOIC package

over the industrial temperature range, and a 32-lead small

(7 mm square) TQFP package over the commercial

temperature range.

BLOCK DIAGRAM

*Patent pending

ADC Section 1

AIN

1:8

Mux

T/H

Auto-

Zero

CMP

CLK In

Enable

Data

Valid

P1

...P2

Timing

and P7

Control

P8

... ADC Section 2

ADC Section 7

ADC Section 8

T/H

Auto-

Zero

CMP

11-Bit

11

SAR

11

DAC

D10 Overrange

D9 (MSB)

D8

D7

...

... 11

11

11-Bit

8:1

D6

Mux/

D5

Error

Correction

11

D4

11-Bit

SAR

D3

11

DAC

D2

D1

Ref

In

Reference Ladder

VREF

D0 (LSB)

Signal Processing Technologies, Inc.

4755 Forge Road, Colorado Springs, Colorado 80907, USA

Phone: 719-528-2300 Fax: 719-528-2370 Web Site: http://www.spt.com e-mail: sales@spt.com

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