ADS7881

SLAS400B − SEPTEMBER 2003 − REVISED NOVEMBER 2005

12BIT, 4MSPS

LOW POWER SAR ANALOGTODIGITAL CONVERTER

FEATURES

− 0 V to 2.5 V

APPLICATIONS

Switching)

DESCRIPTION

The ADS7881 is a 12-bit 4-MSPS A-to-D converter with

2.5-V internal reference. The device includes a capacitor

based SAR A/D converter with inherent sample and hold.

The device offers a 12-bit parallel interface with an

additional byte mode that provides easy interface with 8-bit

processors. The device has a pseudo-differential input

stage.

The −IN swing of

±200 mV is useful to compensate for

ground voltage mismatch between the ADC and sensor

and also to cancel common-mode noise. With nap mode

enabled, the device operates at lower power when used at

lower conversion rates. The device is available in 48-pin

TQFP and QFN packages.

_

+

SAR

Output

Latches

and

3-State

Drivers

BYTE

12/8-Bit Parallel

Data Output Bus

Conversion

and

Control Logic

CONVST

BUSY

CS

RD

A_PWD

PWD/RST

CDAC

Comparator

CLOCK

2.5 V

Internal

Reference

+IN

−IN

REFIN

REFOUT

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.

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.

Copyright

 2003 − 2005, Texas Instruments Incorporated