ADS822_15 Datasheet, PDF (1/18 Pages) Texas Instruments – ANALOG-TO-DIGITAL CONVERTERS

ADS822
ADS825
ADS822
ADS825
SBAS069B – MARCH 2001 – REVISED AUGUST 2002
10-Bit, 40MHz Sampling
ANALOG-TO-DIGITAL CONVERTERS
FEATURES
q HIGH SNR: 60dB
q HIGH SFDR: 72dBFS
q LOW POWER: 190mW
q INTERNAL/EXTERNAL REFERENCE OPTION
q SINGLE-ENDED OR
FULLY DIFFERENTIAL ANALOG INPUT
q PROGRAMMABLE INPUT RANGE
q LOW DNL: 0.5LSB
q SINGLE +5V SUPPLY OPERATION
DESCRIPTION
The ADS822 and ADS825 are pipeline, CMOS Analog-to-Digital
Converters (ADC) that operate from a single +5V power supply.
These converters provide excellent performance with a single-ended
input and can be operated with a differential input for added spurious
performance. These high-performance converters include a 10-bit
quantizer, high-bandwidth track-and-hold, and a high-accuracy inter-
nal reference. They also allow for the user to disable the internal
reference and utilize external references. This external reference
option provides excellent gain and offset matching when used in
multichannel applications, or in applications where full-scale range
adjustment is required.
+V_S
ADS822
ADS825
q +3V OR +5V LOGIC I/O COMPATIBLE (ADS825)
q POWER DOWN: 20mW
q SSOP-28 PACKAGE
APPLICATIONS
q MEDICAL IMAGING
q TEST EQUIPMENT
q COMPUTER SCANNERS
q COMMUNICATIONS
q VIDEO DIGITIZING
The ADS822 and ADS825 employ digital error correction techniques
to provide excellent differential linearity for demanding imaging appli-
cations. Its low distortion and high SNR give the extra margin needed
for medical imaging, communications, video, and test instrumentation.
The ADS822 and ADS825 offer power dissipation of 190mW and also
provide a power-down mode, thus reducing power dissipation to only
20mW. The ADS825 is +3V or +5V logic I/O compatible.
The ADS822 and ADS825 are specified at a maximum sampling
frequency of 40MSPS and a single-ended input range of 1.5V to 3.5V.
The ADS822 and ADS825 are available in an SSOP-28 package and
are pin-for-pin compatible with the 10-bit, 60MSPS ADS823 and
ADS826, and the 10-bit, 75MSPS ADS828, providing an upgrade
path to higher sampling frequencies.
CLK
VDRV
Timing
Circuitry
V_IN
IN
IN
T/H
10-Bit
Pipelined
A/D Core
Error
Correction
Logic
D0
3-State
Outputs
•••
D9
CM
Internal
Reference
Optional External
Reference
Int/Ext
PD OE
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 Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
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Copyright © 2001, Texas Instruments Incorporated