FEATURES

SELF-CALIBRATING

HIGH SFDR: 85dB at NYQUIST

HIGH SNR: 76dB

LOW POWER: 250mW

DIFFERENTIAL OR SINGLE-ENDED INPUTS

+3V/+5V LOGIC I/O COMPATIBLE

FLEXIBLE INPUT RANGE

OVER-RANGE INDICATOR

INTERNAL OR EXTERNAL REFERENCE

APPLICATIONS

IF AND BASEBAND DIGITIZATION

CCD IMAGING SCANNERS

TEST INSTRUMENTATION

IR IMAGING

DESCRIPTION

The ADS850 is a high dynamic range, 14-bit Analog-to-Digital

Converter (ADC) that utilizes a fully differential input, allowing for

either single-ended or differential input interface over varying

input spans. This converter features digital error correction techniques

ensuring 14-bit linearity and a calibration procedure that

corrects for capacitor and gain mismatches. The ADS850 also

includes a high-bandwidth track-and-hold that provides excellent

spurious performance up to and beyond the Nyquist rate.

The ADS850 provides an internal reference that can be programmed

for a 2Vp-p input range for the best spurious performance

and ease of driving. Alternatively, the 4Vp-p input range

can be used for the lowest input referred noise, offering

superior signal-to-noise performance for imaging applications.

There is also the capability to set the range between 2Vp-p and

4Vp-p, or to use an external reference. The ADS850 also

provides an over-range indicator flag to indicate if the input has

exceeded the full-scale input range of the converter.

The low distortion and high signal-to-noise performance provide

the extra margin needed for communications, imaging,

and test instrumentation applications. The ADS850 is available

in a TQFP-48 package.