FEATURES
HIGH SFDR: 80dB at NYQUIST
HIGH SNR: 69dB
LOW POWER: 180mW
LOW DLE: ±0.3LSB
FLEXIBLE INPUT RANGE
OVERRANGE INDICATOR

APPLICATIONS
IF AND BASEBAND DIGITIZATION
CCD IMAGING
SCANNERS
TEST INSTRUMENTATION

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 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 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
of 0.09LSBs rms giving superior imaging performance. There
is also a capability to set the input range in between the 2Vpp
and 5Vp-p input ranges or to use external reference. The
ADS804 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 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 available
in a SSOP-28 package.