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.