ADS7882_14 Datasheet, PDF (1/30 Pages) Texas Instruments – 12-BIT, 3-MSPS LOW POWER SAR ANALOG-TO-DIGITAL CONVERTER

ADS7882
www.ti.com ........................................................................................................................................................................................... SLAS630 – DECEMBER 2008
12-BIT, 3-MSPS
LOW POWER SAR ANALOG-TO-DIGITAL CONVERTER
FEATURES
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• 3-MHz Sample Rate, 12-Bit Resolution
• Zero Latency
• Unipolar, Pseudo Differential Input, Range:
– 0 V to 2.5 V
• High-Speed Parallel Interface
• 69.5 dB SNR at 100 kHz I/P
• Power Dissipation 85 mW at 3 MSPS
• Nap Mode (10 mW Power Dissipation)
• Power Down (10 µW)
• Internal Reference
• Internal Reference Buffer
• 48-Pin TQFP Package
APPLICATIONS
• Optical Networking (DWDM, MEMS Based
Switching)
• Spectrum Analyzers
• High Speed Data Acquisition Systems
• High Speed Close-Loop Systems
• Telecommunication
• Ultra-Sound Detection
DESCRIPTION
The ADS7882 is a 12-bit 3-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 package.
+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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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.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2008, Texas Instruments Incorporated