I have some digital waveforms, during the idle interval, it's zero, while in active mode, some patterns are output. This waveform is send through DAC (TI DAC290x-EVM) and ADC (Analog AD9218). I am expecting a clean zeros during the idle interval, however the ADC output are not. How can I correct this problem?
Thanks in advance.
How does it compare with the analog signal? What is the magnitude of your error? IF there an AC component to your reading during idle? If the error is small, it is probably system noise.
-- Thad
while in
IThank you Thad. I have a 4 channel oscilloscope and can see three ADC pins only. My digital signal is 20MS/s, 10us idle and 30us active. I channel of DAC is fed into oscilloscope and Q channel to ADC. From what I saw, during idle interval, bits 4,5,6 (0~9) have level changes during the idle and active interval.
I am setting DFS/GAIN pin to low for ADC board, and the DAC's I channel waveform lies between -20mV~20mV (idle) ~ 0.8V(active) on oscilloscope.
while in
IThank you Thad. I have a 4 channel oscilloscope and can see three ADC pins only. My digital signal is 20MS/s, 10us idle and 30us active. I channel of DAC is fed into oscilloscope and Q channel to ADC. From what I saw, during idle interval, bits 4,5,6 (0~9) have level changes during the idle and active interval.
I am setting DFS/GAIN pin to low for ADC board, and the DAC's I channel waveform lies between -20mV~20mV (idle) ~ 0.8V(active) on oscilloscope.
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