Hi Viktor (or Scott),
Can the GPIO pins be used to synchronize multiple PGA970s to generate the SAME
waveforms (with exactly the same frequency)? With this method, do we make the program
watch the transitions on one GPIO pin to decide when to advance the pointer in the lookup
table? So as long as we set up all channels to have the same lookup table, they will generate
almost the same frequencies; the effect caused by the channels having independent crystals
will show up as some sort of high frequency noise, which could be easily filtered?
In this case, how many GPIO input pins can one GPIO output pin drive? And, what values
would you recommand for the R and C between the PI and PE pins?
If we use your second method -- feed one PI to all the PE pins, we will be guaranteed to have
exactly the same waveform for all channels. Again, how many PE pins can one PI pin drive?
Would you recommand one RC filter right at the output PI pin for all channels, what values?
Or a filter for each channel at the PE pin?
And, how will the overall gain change if we insert the filter?
Our goal is to use the same waveform for all the channels on the same board, to avoid beating.
Thank you expert in advance. Best regards,
