Part Number: ADS8556
Hello support team,
Our customer is using ADS8556 now.
According to it's datasheet, the optimum capacitance value of the decoupling capacitor connected to pin 51 (REFIO) is 470 nF.But the customer would like to change to 1000 nF because it is difficult to obtain parts currently.
Looking at External load capacitance on page 9 of datasheet, the maximum value of it is not specified.Is it OK to use 1000 nF?And, are there any concerns regarding using 1000 nF?(For example, the time to stable operation at power on becomes longer, and so on)
Best regards,M. Tachibana
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In reply to Cynthia:
Thank you for your reply.We are waiting for feedback from your design team.
In reply to Masanori Tachibana:
Design team has responded and confirmed that the device can function with minimal degradation with a 1000nF capcitor on the REFIO pin.
With that said, we cannot say exactly how this will effect the REF turn-on settling time. The datasheet specs a typical turn on time of 10ms and we do not predict it will be slowed down too much, but we do suggest to check the settling time of the reference with the new capacitor size to be aware of the present changes.
Thank you very much for confirming with the design team.Even if 1000 nF of capacitor was connected to the REFIO pin, I understood that it was not so problem.I advised our customer to evaluate enough.
By the way, In Electrical Characteristics: General on the datasheet page 9, "At REFIO pins" of External load capacitance is stated as TYP : 470 μF and MIN : 100 μF. I think that this is a typo and these unit are not μF but nF.Can you revise it when the next updating of the datasheet?
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