10-Bit, 40MHz Sampling
ANALOG-TO-DIGITAL CONVERTER
FEATURES
a71 NO MISSING CODES
a71 INTERNAL REFERENCE
a71 LOW POWER: 380mW
a71 HIGH SNR: 58dB
a71 INTERNAL TRACK-AND-HOLD
DESCRIPTION
The ADS821 is a low-power, monolithic 10-bit, 40MHz Ana-
log-to-Digital (A/D) converter utilizing a small geometry CMOS
process. This complete converter includes a 10-bit quantizer
with internal track-and-hold, reference, and a power-down
feature. It operates from a single +5V power supply and can
be configured to accept either differential or single-ended
input signals.
The ADS821 employs digital error correction to provide
excellent Nyquist differential linearity performance for de-
manding imaging applications. Its low distortion, high SNR,
and high oversampling capability give it the extra margin
needed for telecommunications and video applications.
This high-performance converter is specified for AC and DC-
performance at a 40MHz sampling rate. The ADS821 is
available in an SO-28 package.
APPLICATIONS
a71 VIDEO DIGITIZING
a71 ULTRASOUND IMAGING
a71 GAMMA CAMERAS
a71 SET-TOP BOXES
a71 CABLE MODEMS
a71 CCD IMAGING
Color Copiers
Scanners
Camcorders
Security Cameras
Fax Machines
a71 IF AND BASEBAND DIGITIZATION
a71 TEST INSTRUMENTATION
ADS821
SBAS040B – DECEMBER 1995 – REVISED FEBRUARY 2005
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Copyright © 1995-2005, Texas Instruments Incorporated
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.
Pipeline
A/D
Converter
Timing
Circuitry
Error
Correction
Logic
3-State
Outputs
T&H
10-Bit
Digital
Data
CLK
+1.25V
+3.25V
MSBI OE
IN
IN
REFT
CM
REFB
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.
A
D
S
82
1U
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