ADS803_14 Datasheet, PDF (1/18 Pages) Texas Instruments – 12-Bit, 5MHz Sampling ANALOG-TO-DIGITAL CONVERTER

ADS803E
ADS803
SBAS074B – JANUARY 1997 – REVISED SEPTEMBER 2002
12-Bit, 5MHz Sampling
ANALOG-TO-DIGITAL CONVERTER
FEATURES
q HIGH SFDR: 82dB at NYQUIST
q HIGH SNR: 69dB
q LOW POWER: 115mW
q LOW DLE: 0.25LSB
q FLEXIBLE INPUT RANGE
q OVER-RANGE INDICATOR
DESCRIPTION
The ADS803 is a high-speed, high dynamic range, 12-bit
pipelined Analog-to-Digital (A/D) converter. This converter
includes a high-bandwidth track-and-hold that gives excel-
lent spurious performance up to and beyond the Nyquist rate.
This high-bandwidth, linear track-and-hold minimizes har-
monics and has low jitter, leading to excellent SNR perfor-
mance. The ADS803 is also pin-compatible with the 10MHz
ADS804 and the 20MHz ADS805.
The ADS803 provides an internal reference and can be
programmed for a 2Vp-p input range for the best spurious
performance and ease of driving. Alternatively, the 5Vp-p input
range can be used for the lowest input referred noise of
+V_S
APPLICATIONS
q IF AND BASEBAND DIGITIZATION
q CCD IMAGING SCANNERS
q TEST INSTRUMENTATION
0.09LSBs rms giving superior imaging performance. There is
also a capability to set the input range in between the 2Vp-p
and 5Vp-p input ranges or to use an external reference. The
ADS803 also provides an over-range indicator flag to indicate
an input range that exceeds the full-scale input range of the
converter. This flag can be used to reduce the gain of the front-
end gain-ranging circuitry.
The ADS803 employs digital error-correction techniques to
provide excellent differential linearity for demanding imaging
applications. Its low distortion and high SNR give the extra
margin needed for communications, medical imaging, video,
and test instrumentation applications. The ADS803 is avail-
able in an SSOP-28 package.
CLK
VDRV
ADS803
Timing Circuitry
V_IN
IN
IN
T&H
CM
12-Bit
Pipelined
ADC
Error
Correction
Logic
D0
3-State
Outputs
•••
D11
Reference Ladder
and Driver
Reference and
Mode Select
OVR
REFT
V_REF
SEL REFB
OE
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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 © 1997, Texas Instruments Incorporated