FEATURES
HIGH SFDR: 82dB at NYQUIST
HIGH SNR: 69dB
LOW POWER: 115mW
LOW DLE: 0.25LSB
FLEXIBLE INPUT RANGE
OVER-RANGE INDICATOR

APPLICATIONS
IF AND BASEBAND DIGITIZATION
CCD IMAGING SCANNERS
TEST INSTRUMENTATION

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 excellent
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 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
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 frontend
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 available
in an SSOP-28 package.