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Part Number: SN75LVDT390
When I use LVDT390, the differential input P-impedance changes from 180KΩ to 453Ω, which leads to a high single-ended signal. I would like to ask under what circumstances this situation occurs, the use of chips will break down?
In addition, I have another question. Does the load input current of the output terminal, which is higher then 10 mA, affect the differential input?
The voltage supply is 3.3V, well grounded, and the differential input is connected to the printed circuit board by cable.
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In reply to Yaser Ibrahim:
In reply to user5993392:
Thank you very much for your reply. This is part of my schematic diagram and PCB. In the PCB layout, most of the LVDT390 used before was broken. The capacitor C300 was not placed near LVDT390. Is this the reason why the LVDT390 burned out?
Also, you think it might be ESD. How can I design to avoid ESD? Thank you and look forward to your reply.
Thank you for your reply. The last picture was not shown, so I am sending it again.
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