FEATURES
HIGH SFDR: 74dB at 9.8MHz fIN
HIGH SNR: 68dB
LOW POWER: 300mW
LOW DLE: 0.25LSB
FLEXIBLE INPUT RANGE
OVER-RANGE INDICATOR

APPLICATIONS
STUDIO CAMERAS
IF AND BASEBAND DIGITIZATION
COPIERS
TEST INSTRUMENTATION

DESCRIPTION
The ADS805 is a 20MHz, high dynamic range, 12-bit, pipelined
Analog-to-Digital Converter ADC. This converter includes a
high-bandwidth track-and-hold that gives excellent spurious
performance up to and beyond the Nyquist rate. This highbandwidth,
linear track-and-hold minimizes harmonics and
has low jitter, leading to excellent Signal-to-Noise Ratio
(SNR) performance. The ADS805 is also pin-compatible with
the 10MHz ADS804 and the 5MHz ADS803.
The ADS805 provides an internal reference or an external
reference can be used. The ADS805 can be programmed for
a 2Vp-p input range which is the easiest to drive with a single
op amp and provides the best spurious performance. 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 the capability to set the input
range between 2Vp-p and 5Vp-p, either single-ended or
differential. The ADS805 also provides an over-range flag
that indicates when the input signal has exceeded the
converter’s full-scale range. This flag can also be used to
reduce the gain of the front end signal conditioning circuitry.
The ADS805 employs digital error 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 ADS805 is available in
an SSOP-28 package.