Hello,
My customer has a question about ADS54J54.
[Q]
Is the state of SYSREF fixed in the following condition?
<Conditions>
* AC Coupled SYSREF
* The SYSREF source outputs Low or High.
Best Regards,
Hiroshi Katsunaga
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Hello,
My customer has a question about ADS54J54.
[Q]
Is the state of SYSREF fixed in the following condition?
<Conditions>
* AC Coupled SYSREF
* The SYSREF source outputs Low or High.
Best Regards,
Hiroshi Katsunaga
Hiroshi,
If the customer wants to use AC coupling for SYSREF, if they plan on turning off SYSREF, they should provide weak pull up and pull down resistors on the side of the capacitors connected to the ADC to guarantee the output of the capacitors do not go to an unknown level, which could cause a false SYSREF pulse to occur inside the ADC. This is why we recommend customer use DC coupling if possible.
Regards,
Jim