SPT774CCS datasheet(1/12 Pages) ETC

Part #	SPT774CCS

Description	FAST, COMPLETE 12-BIT UP COMPATIBLE A/D CONVERTER WITH SAMPLE/HOLD

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SPT774

FAST, COMPLETE 12-BIT

µP COMPATIBLE

A/D CONVERTER WITH SAMPLE/HOLD

FEATURES

• Improved Higher Performance Version of the HADC574Z

• Complete 12-Bit A/D Converter with Sample/Hold,

Reference and Clock

• Low Power Dissipation (120 mW Max)

• 12-Bit Linearity (Over Temp)

•8

µs Max Conversion Time

• Single +5 V Supply

• Full Bipolar and Unipolar Input Range

APPLICATIONS

• Data Acquisition Systems

• 8 or 12-Bit

µP Input Functions

• Process Control Systems

• Test and Scientific Instruments

• Personal Computer Interface

GENERAL DESCRIPTION

The SPT774 is a complete, 12-bit successive approximation

A/D converter manufactured in CMOS technology. The de-

vice is an improved version of the HADC574Z. Included on

chip are an internal reference, clock, and a sample-and-hold.

The S/H is an additional feature not available on similar

devices.

The SPT774 features 8

µs (max) conversion time of 10 or

20 V input signals. Also, a three-state output buffer is added

for direct interface to an 8-, 12- or 16-bit

µP bus.

The SPT774 has standard bipolar and unipolar input ranges

of 10 V and 20 V that are controlled by a bipolar offset pin and

laser trimmed for specified linearity, gain and offset accuracy.

The power supply is +5 V. The device also has an optional

mode control voltage which may be used depending on the

application. With a maximum dissipation of 120 mW at the

specified voltages, power consumption is about five times

lower than that of currently available devices.

The SPT774 is available in 28-lead ceramic sidebrazed DIP,

PDIP and SOIC packages in the commercial temperature

range.

BLOCK DIAGRAM

Three-State Buffers And Control

Nibble A

Nibble B

Nibble C

12-Bit SAR

+

-

Comp

Clock

Offset/Gain

Trim

Control Logic

12-Bit

Capacitance

DAC

STS

AoCE

AGND

20 V In

12/8

CS

R/C

Ref

Ref Out

10 V In

BIP Off

Output

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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