Dear Engineer,
I'm working on the upgrade of one of our product, the current product is based on multiplexer and AD7793, REF193, and we need to add new signal input +/-5, +/-10V based on current product.
I have a few question about CN0325 after reviewing the "EVAL-CN0325-SDPZ-Schematic-Rev0.pdf",
1) What's the function of R99 (10mega ohm) used in Schematic "UIM WITH 6TB" or R130 (10mega ohm) used in Schematic "UIM WITH 4TB".
2) Can I use ADG508F(with fault protect) as multiplexer for CN0325 instread of using the overvoltage protection diode D20,D22 in Schematic "UIM WITH 6TB" or D5,D7 in Schematic "UIM WITH 4TB".
3) For CN0325, when multiplexer selected to be thermocouple/millivoltage channel, can ADC be protected from an overvoltage e.g. 30V input ?
Thanks and Regards
Alex