ADS2806

Dual, 12-Bit, 32MHz Sampling

ANALOG-TO-DIGITAL CONVERTER

FEATURES

q SPURIOUS-FREE DYNAMIC RANGE:

q HIGH SNR: 67dB (2Vp-p), 69dB (3Vp-p)

q INTERNAL OR EXTERNAL REFERENCE

q LOW DLE:

q FLEXIBLE INPUT RANGE: 2Vp-p to 3Vp-p

q TQFP-64 POWER PACKAGE

DESCRIPTION

The ADS2806 is a dual, high-speed, high dynamic range,

12-bit pipelined Analog-to-Digital Converter (ADC). This con-

verter includes a high-bandwidth track-and-hold that gives

excellent spurious performance up to and beyond the Nyquist

rate. The differential nature of this track-and-hold and ADC

circuitry minimizes even-order harmonics and gives excel-

lent common-mode noise immunity. The track-and-hold can

also be operated single-ended.

The ADS2806 provides for setting the full-scale range of the

converter without any external reference circuitry. The internal

APPLICATIONS

q COMMUNICATIONS IF PROCESSING

q COMMUNICATIONS BASESTATIONS

q TEST EQUIPMENT

q MEDICAL IMAGING

q VIDEO DIGITIZING

q CCD DIGITIZING

Optional External

Reference

12-Bit

Pipelined

A/D

Error

Correction

Logic

Timing

Circuitry

Internal

Reference

3-State

Outputs

T&H

D12A

•

•

•

D1A

12-Bit

Pipelined

A/D

Error

Correction

Logic

3-State

Outputs

T&H

D12B

•

•

•

D1B

IN

A

+V

S

OE

A

OVR

A

OVR

B

IN

A

INT/EXT

CLK

FS

SEL

(Opt.)

IN

B

V

IN

CM

OE

B

IN

B

(Opt.)

ADS2806

V

IN

reference can be disabled allowing low drive, external refer-

ences to be used for improved tracking in multichannel systems.

The ADS2806 provides an over-range indicator flag to

indicate an input signal that exceeds the full-scale input

range of the converter. This flag can be used to reduce the

gain of front end gain control circuitry. There is also an

output enable pin to allow for multiplexing and testability on

a PC board.

The ADS2806 employs digital error correction techniques to

provide excellent differential linearity for demanding imag-

ing applications. The ADS2806 is available in a TQFP-64

power package.

ADS2806

SBAS178B – DECEMBER 2000 – REVISED MAY 2002

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 © 2000, 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.