AnsweredAssumed Answered

RF glitch in spectrum when initialize AD9789.

Question asked by lijun on Jul 30, 2012
Latest reply on Aug 21, 2012 by danf

anyone can help the resolve the problem. when i initialize AD9789 after power up, sometimes there will be glitch in the spectrum, sometimes there will not. i have done some test.  i changed the clock frequency of spi bus. but the problem also exist.  i set all the data bits to dac to zero, the problem also exist. i turn off all the channles, the problem also exist. only when set the reset register to 1 and not release, the output will be very clean.

any one can tell me why AD9789 will output gilitch when initialize?  because i design a device use AD9789 and will connect to high power amplifier, so the gilitch is harmful. i'm very urgent to know how to config to avoid this problem.   thanks.