Please explain, why RClamp0504P was introduced into the ADV7612 ref. designs when there already existed RClamp0524P with the same functionality and at least twice less expensive? Maybe there is some hidden meaning?
They're basically the same parts except the 524 flows real well with TMDS signal off the HDMI connector. And the 524 has only 0.3pF load on the signal while the 0504 has <3pF
You can use the 524 in the 504 position but I'd stick with the 524 for the easy TMDS flow through and low capacitance.
I looked into RClamp0504P datasheet and it seems very much different from RClamp0524P.
RClamp0504P is designed to protect data lines by clamping them to a fixed reference and it has an input for this reference voltage.
RClamp0524P doesn't have that kind of input for reference voltage.
But it is strange, that in Dual ADV7612 Eval Board Schematic this RClamp0504P reference voltage input is left floating.
Is it an error?
To what voltage then signals ( SCL, SDA, CEC , HPA ) connected to RClamp0504P are to be clamped?
To +3.3V ?
If Yes, then why is that needed?
Because ADV7612 SCL, SDA, CEC , HPA inputs do not tolerate +5V?
If Yes, then can I use just ordinary diodes for that clamping?
Please also confirm, that RClamp0524P is useless for that purpose.
The RClamp0504P has an internal 5V zener and you have to route the trace to each pin. They had an extra pin so they brought it out so you could lower the clamp voltage if you wanted to.
The RClamp0524 has an internal 5V zener and is intended for pass through traces where the part lays right on top of the traces. No extra pin so they could not bring out the zener point
RClamp0524 is great for TMDS lines since they run in parallel, makes layout easier. They both protect with the 5V zener
Retrieving data ...