Hello,
I have a possible technical problem with the VFC110 IC.
Basically the problem is the same as the one Mohamed Ozayou asked some time ago.
The link to the original question:
This issue was closed because Mohamed didn't clarify what is meant by "some batches don't work anymore".
So now he problem is somewhat escalated and the situation is:
- We tested that the VFC110 from the following batches can't be used in our circuit:
87Z36DW
87Z36FW
87Z36HW
- Other (maybe older?) batches of ICs works just fine and the circuit is originally used from 2004 and the actual problem started to happen just with the new batches of VFC110 (on the boards we now have sockets for the ICs so we can test which ICs can be used).
- Unfortunately I don't know what the exact problem is - I suppose that the IC don't generate output frequency (?). (I have no access to the physical boards.)
Out circuit for the VFC110:
The input signal for the VFC110 is from an AD548KN opamp output.
The VFC110 output is connected to a 74HC08 logic gate.
I checked the circuit with the VFC110 datasheet, but I see no evident problem.
Maybe you will have some idea what the problem can be...
Thanks,
Mikuláš Reichel