Low-Power 12-Bit Sampling CMOS

ANALOG-to-DIGITAL CONVERTER

DESCRIPTION

The ADS7806 is a low-power, 12-bit, sampling Analog-to-

Digital (A/D) converter using state of the art CMOS structures.

It contains a complete 12-bit, capacitor-based, Successive

Approximation Register (SAR) A/D converter with sample-

and-hold, clock, reference, and a microprocessor interface with

parallel and serial output drivers.

The ADS7806 can acquire and convert to full 12-bit accuracy

in 25

µs max, while consuming only 35mW max. Laser

trimmed scaling resistors provide standard industrial input

ranges of

±10V and 0V to +5V. In addition, a 0V to +4V range

allows development of complete single-supply systems.

The ADS7806 is available in a 0.3" DIP-28 and SO-28, both

fully specified for operation over the industrial –40

°C to

+85

°C temperature range.

FEATURES

q POWER DISSIPATION: 35mW max

q POWER-DOWN MODE: 50

q ACQUISITION AND CONVERSION: 25

q

q 72dB MIN SINAD WITH 1kHz INPUT

q INPUT RANGES:

q SINGLE +5V SUPPLY OPERATION

q PARALLEL AND SERIAL DATA OUTPUT

q PIN-COMPATIBLE WITH THE 16-BIT ADS7807

q USES INTERNAL OR EXTERNAL REFERENCE

q 0.3" DIP-28 AND SO-28

ADS7806

SBAS021B – NOVEMBER 1992 – REVISED SEPTEMBER 2003

www.ti.com

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

Copyright © 1992-2003, Texas Instruments Incorporated

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

ADS7806

ADS7

806

CDAC

6k

Ω

40k

Ω

10k

Ω

BUSY

Parallel

and

Serial

Data

Out

Comparator

Buffer

20k

Ω

R1

IN

R2

IN

REF

Successive Approximation Register and Control Logic

Clock

Power

Down

BYTE

CS

R/C

40k

Ω

Internal

+2.5V Ref

Reference

Power-Down

Serial Data

Clock

Parallel Data

CAP

Serial Data

8

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