ADS7881_13 Datasheet, PDF (1/31 Pages) Burr-Brown (TI) – 12-BIT, 4-MSPS LOW POWER SAR ANALOG-TO-DIGITAL CONVERTER

ADS7881
SLAS400B − SEPTEMBER 2003 − REVISED NOVEMBER 2005
12ĆBIT, 4ĆMSPS
LOW POWER SAR ANALOGĆTOĆDIGITAL CONVERTER
FEATURES
D 4 MHz Sample Rate, 12-Bit Resolution
D Zero Latency
D Unipolar, Pseudo Differential Input, Range:
− 0 V to 2.5 V
D High Speed Parallel Interface
D 71 dB SNR and −88.5 dB THD at 1 MHz I/P
D Power Dissipation 95 mW at 4 MSPS
D Nap Mode (10 mW Power Dissipation)
D Power Down (10 mW)
D Internal Reference
D Internal Reference Buffer
D 48-Pin TQFP and QFN Packages
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.
APPLICATIONS
D Optical Networking (DWDM, MEMS Based
Switching)
D Spectrum Analyzers
D High Speed Data Acquisition Systems
D High Speed Close-Loop Systems
D Telecommunication
D Ultra-Sound Detection
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.
+IN
+
−IN
_
REFIN
REFOUT
SAR
CDAC
Comparator
Output
Latches
and
3-State
Drivers
BYTE
12/8-Bit Parallel
Data Output Bus
CLOCK
2.5 V
Internal
Reference
Conversion
and
Control Logic
PWD/RST
A_PWD
CONVST
BUSY
CS
RD
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semiconductor products and disclaimers thereto appears at the end of this data sheet.
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  2003 − 2005, Texas Instruments Incorporated