Hi, The AD9850 has a 10bit DAC. If the AD9850 does not dither the 10bit ADC output the zero crossings for a 1MHz signal will have an aprox resolution of 2^-10*1us~1ns on average. If the lookup table feeding values to the dac has 10 address lines (just guessing, I do not see any anything on it on the datasheet), you will have an additional uncertainty of 1ns to the phase error. Adding these two we have the ~2ns Ulrich is measuring.
What do you think? Pablo > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
