ADS5221 Datasheet, PDF (1/19 Pages) Texas Instruments – 12-Bit, 65MSPS Sampling, +3.3V ANALOG-TO-DIGITAL CONVERTER

ADS5221
ADS5221
SBAS262A – APRIL 2003 – REVISED DECEMBER 2003
12-Bit, 65MSPS Sampling, +3.3V
ANALOG-TO-DIGITAL CONVERTER
FEATURES
q HIGH SNR: 70dB
q HIGH SFDR: 88dBFS
q LOW POWER: 285mW
q INTERNAL/EXTERNAL REFERENCE OPTION
q SINGLE-ENDED OR
FULLY DIFFERENTIAL ANALOG INPUT
q FLEXIBLE DUTY CYCLE ADJUST CIRCUITRY
q LOW DNL: 0.5LSB
q SINGLE +3.3V SUPPLY OPERATION
q TQFP-48
APPLICATIONS
q WIRELESS LOCAL LOOP
q COMMUNICATIONS
q MEDICAL IMAGING
q PORTABLE INSTRUMENTATION
AV_DD
ADS5221
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.
CLK
VDRV
Timing/Duty Cycle
Adjust
Circuitry
IN
V_IN
IN
S/H
12-Bit
Pipelined
ADC
Error
Correction
Logic
D0
3-State
Output
•••
D11
Internal
Reference
OVR
STPD QPD
REFT REFB
RSEL V_REF
OE
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