Dear all, I want to use AD9914'DRG generate LFM waveform with different starting phase,but I can not find the information from the datasheet. Can Someone else tell me a hint. Thanks a lot!
When using the DRG for frequency sweeping it merely updates the DDS frequency tuning word at the appropriate rate to generate the desired frequency sweep. Hence, the DRG has no sense of phase.
Instantaneous phase depends on the value of the phase accumulator at any given instant plus the phase offset programmed in one of the Profiles.
You can achieve a specific starting phase by doing the following prior to initiating a frequency sweep:
The above sequence is necessary each time you want a new starting phase at the beginning of a frequency sweep.
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