we are unable to programme DDS in either modes (parallel, direct, serial modes). All the regulators are ok with enough current capability (tested with external drive). DAC reset resistor , DAC Bypass capacitor correctly assembled. we are feeding in 3 GHz, and sync clock is coming @ 125 MHz (1/24) BUT the level of swing in oscilloscope is 600 mv to 1.8 v. can anybody help us. help is urgently needed.