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.