Texas Instruments ADS7890 Handleiding

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SLAS409 − DECEMBER 2003

 

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FEATURES

D1.25 MHz Sample Rate, 14-Bit Resolution

DZero Latency

DUnipolar, Pseudo Differential Input, Range:

− 0 V to 2.5 V

DSPIE Compatible Serial Interface

D77.5 dB SNR and −95 dB THD at 0.5 MHz I/P

DPower Dissipation 45 mW at 1.25 MSPS

DNap Mode (10 mW Power Dissipation)

DPower Down (10 mW)

DInternal Reference

DInternal Reference Buffer

D48-Pin TQFP Package

APPLICATIONS

DOptical Networking (DWDM, MEMS Based

Switching)

DSpectrum Analyzers

DHigh Speed Data Acquisition Systems

DHigh Speed Close-Loop Systems

DTelecommunication

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

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

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.

Product specificaties