Hi, I would like to ask some qustions on the AD73360 REFCAP.
Earliest replies from the responsible staff member for this product would be appreciated.
I'm reffing to the AD73360 Rev. B datasheet.
Q1. In PIN FUNCTION DECRIPTION, there is a description that the REFCAP pin can be overdriven by an external reference.
Can it really driven by an external reference? The reason why I ask such a question is as follows.
The REFCAP should be a low impedance output. Driving this pin with another low output impedance refence
would make a short-cicuit of the two refenrences, and this would not be acceptable.
Q2: Assuming an external reference can be used to overdrive the REFCAP, what would be the requirements for it in terms of electrical specification?
Sorry for the delay. This question got misrouted.
Although the AD73360 datasheet mentions using an external reference, there are some things to note:
To overdrive REFCAP “high”, the external reference would need to have (approx) > 0.5mA current source capability.
To overdrive REFCAP “low”, the external reference would need to have (approx) > 2mA current sink capability.