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AD7656 busy signal after noise on CONV x

Question asked by on May 1, 2014
Latest reply on Jun 1, 2014 by KarenNE

Dear Karen,


We captured two waveform today. See attachment. There is noise at cursor a and I can see adcBusy0 is high

for 2.88us. That seems like the right conversion time. But it's definitely not the data I wanted. I don't know what pulse width of the CONV x  will trigger conversion? May we put small cap to help?

tek00459.pngthis high

From the second waveform, we can see the noise at cursor b. and busy signal goes low until we reset it(FPGA will check the low and reset ADC. There is nothing on RST because the probe fell off).


Thank you for your help and look forward to hearing from you!