We have used ADG5462F part in our design as ADC Channel protector. We are facing issue with its functionality as we are not getting expected output for the applied input.
Eg: When we are giving 6V as input, we are getting some random voltages at its output. Some channels are giving 9.9V, 11.25V . 1.2V, 0,3V for the same 6V input.
Schematic is attached for your reference. Could please suggest what could be the root cause for this issue. Same ADC is working for differential Channels where we have not used this protector
Awaiting of your response
Thank you for contacting Engineerzone.
Initially I do not see anything obviously wrong with your schematic.
Are you using the TSSOP device or the LFCSP? your pin out is consistent with the TSSOP but I notice you have an EP pin in your schematic. The TSSOP does not have an EP pin.
Do you have any scope plots you could share with me? This would help me to debug the issue.
Can I ask about your application? your inputs are +/-10 V correct? What type of sensor input is this?
These are sensor inputs used in military applications. Yes. inputs are +/- 10V only
Can you please suggest , is there any drop-in replacement solution.
I don't option to change PCB design.
Could you please suggest drop-in replacement? This is 15Lakhs board. All other interfaces are up and only this ADC is not ok.
I don't have time and money to redesign the board. Could you please help us to get drop-in replacement part.
Are you looking for a drop in replacement for the ADG5462F LFCSP that fits the TSSOP pinout?
Unfortunately all of our similar devices such as the ADG5412F ADG5412 or ADG1412 follow the same pinout structure.
Yes, We are looking for drop in replacement for the ADG5462F LFCSP.
Can we get custom part which can be configured to resolve this issue.
Awaiting for your reply.
This has been answered offline.