ADS804_14 Datasheet, PDF (1/18 Pages) Texas Instruments – 12-Bit, 10MHz Sampling ANALOG-TO-DIGITAL CONVERTER

ADS804
ADS804E
SBAS068B – JANUARY 1997 – REVISED AUGUST 2002
12-Bit, 10MHz Sampling
ANALOG-TO-DIGITAL CONVERTER
FEATURES
q HIGH SFDR: 80dB at NYQUIST
q HIGH SNR: 69dB
q LOW POWER: 180mW
q LOW DLE: ±0.3LSB
q FLEXIBLE INPUT RANGE
q OVERRANGE INDICATOR
DESCRIPTION
The ADS804 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
harmonics and has low jitter, leading to excellent SNR
performance. The ADS804 is also pin-compatible with the
5MHz ADS803 and the 20MHz ADS805.
The ADS804 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
+V_S
ADS804
APPLICATIONS
q IF AND BASEBAND DIGITIZATION
q CCD IMAGING
q SCANNERS
q TEST INSTRUMENTATION
of 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 external reference. The
ADS804 also provides an over-range indicator flag to indi-
cate 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 ADS804 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 ADS804 is avail-
able in a SSOP-28 package.
CLK
VDRV
Timing Circuitry
V_IN
IN
T&H
IN
(Opt.)
CM
12-Bit
Pipelined
A/D Converter Core
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