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Sinc-Rolloff in AD9781

Question asked by veera on Mar 11, 2013
Latest reply on Mar 13, 2013 by Tguy

Hi,

 

We are currently using DAC in Normal Mode (Input BW = 50MHz and Sampling rate = 200MSPS). However we prefer not to have any attenuation over this band. However in the Transfer function figure shown in the datasheet, it seems the sinc roll-off will affect our signal. We would like to Pre-Equalise this Roll-off. Can you share us the sinc response of the DAC in tabular form so that it will be easier for us to implement pre-emphasis.

 

We are also interested in Return to Zero mode. It looks that in this mode, the roll-off will be minimum. Can you explain this mode? Will there be any effect on the DAC output while choosing this mode apart from output power reduction? Will there be any SNR degradation or any other issues to be considered in this mode?

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