ADS7890

SLAS409 − DECEMBER 2003

14BIT, 1.25MSPS

LOW POWER SAR ANALOGTODIGITAL CONVERTER

FEATURES

− 0 V to 2.5 V

APPLICATIONS

Switching)

DESCRIPTION

The ADS7890 is a 14-bit 1.25-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 14-bit serial SPI or DSP

compatible interface. 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. The device operates at lower power when used at lower conversion

rates because of the nap feature. The device is available in a 48-pin TQFP package.

_

+

SAR

Output

Latches

and

3-State

Drivers

SDO

Conversion

and

Control Logic

SCLK

BUSY

CS

FS

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, Texas Instruments Incorporated

SPI is a trademark of Motorola, Inc.