12-Bit, 65MSPS Sampling, +3.3V
ANALOG-TO-DIGITAL CONVERTER
FEATURES
a71 HIGH SNR: 70dB
a71 HIGH SFDR: 88dBFS
a71 LOW POWER: 285mW
a71 INTERNAL/EXTERNAL REFERENCE OPTION
a71 SINGLE-ENDED OR
FULLY DIFFERENTIAL ANALOG INPUT
a71 FLEXIBLE DUTY CYCLE ADJUST CIRCUITRY
a71 LOW DNL: 0.5LSB
a71 SINGLE +3.3V SUPPLY OPERATION
a71 TQFP-48
APPLICATIONS
a71 WIRELESS LOCAL LOOP
a71 COMMUNICATIONS
a71 MEDICAL IMAGING
a71 PORTABLE INSTRUMENTATION
DESCRIPTION
The ADS5221 is a pipeline, CMOS Analog-to-Digital Con-
verter (ADC) that operates from a single +3.3V power
supply. This converter provides excellent performance with a
single-ended input and can be operated with a differential
input for added spurious performance. This high-perfor-
mance converter includes a 12-bit quantizer, high bandwidth
track-and-hold, and a high accuracy internal reference; it
also allows for the user to disable the internal reference and
utilize external references, providing excellent gain and off-
set matching in multi-channel applications or in applications
where full-scale range adjustment is required.
The ADS5221 employs digital error correction techniques to
enable excellent differential linearity for demanding imaging
applications. Its low distortion and high SNR give the extra
margin needed for medical imaging, communications, video,
and test instrumentation. The ADS5221 offers power dissi-
pation of 285mW and also provides two power-down modes.
The ADS5221 is specified at a maximum sampling fre-
quency of 65MHz and a differential input range of 1V to 2V.
The ADS5221 is available in a TQFP-48.
ADS5221
SBAS262A – APRIL 2003 – REVISED DECEMBER 2003
www.ti.com
Copyright © 2003, 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.
12-Bit
Pipelined
ADC
Internal
Reference
Timing/Duty Cycle
Adjust
Circuitry
Error
Correction
Logic
3-State
Output
S/H
CLK VDRV
ADS5221
AV
DD
OERSELREFBREFT
OVR
QPDSTPD
D0
D11
•
•
•
IN
V
IN
IN
V
REF
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.
All trademarks are the property of their respective owners.
ADS5221