Texas Instruments ADS7881 Handleiding

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SLAS400B − SEPTEMBER 2003 − REVISED NOVEMBER 2005

 

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FEATURES

D4 MHz Sample Rate, 12-Bit Resolution

DZero Latency

DUnipolar, Pseudo Differential Input, Range:

− 0 V to 2.5 V

DHigh Speed Parallel Interface

D71 dB SNR and −88.5 dB THD at 1 MHz I/P

DPower Dissipation 95 mW at 4 MSPS

DNap Mode (10 mW Power Dissipation)

DPower Down (10 mW)

DInternal Reference

DInternal Reference Buffer

D48-Pin TQFP and QFN Packages

APPLICATIONS

DOptical Networking (DWDM, MEMS Based

Switching)

DSpectrum Analyzers

DHigh Speed Data Acquisition Systems

DHigh Speed Close-Loop Systems

DTelecommunication

DUltra-Sound Detection

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_PWDPWD/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 − 2005, Texas Instruments Incorporated

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