Data Sheet

©2009-2013 Exar Corporation

7/11

Rev 1D

Full-scale output current of each D/A converter is deter-

mined by the value of the resistor connected between

D/A full-scale (white) current may also be calculated from:

to full-scale voltage.

Voltage Reference

All three D/A converters are supplied with a common

voltage reference. Internal bandgap voltage reference

voltage is +1.235V with a 3kΩ source resistance. An

pin, overriding the internal voltage reference.

A 0.1µF capacitor must be connected between the COMP

low-noise operation.

An internal voltage source of +1.235V is output on the

here which overrides the internal reference. Decoupling

Power and Ground

Required power is a single +5.0V supply. To minimize power

supply induced noise, analog +5V should be connected

The high slew-rate of digital data makes capacitive cou-

pling to the outputs of any D/A converter a potential

problem. Since the digital signals contain high-frequency

components of the CLK signal, as well as the video out-

put signal, the resulting data feedthrough often looks

like harmonic distortion or reduced signal-to-noise perfor-

mance. All ground pins should be connected to a common

solid ground plane for best performance.