I want to measure 1700V DC in my one of application. Can I use ADUM3190. I will generate the external isolated supply for secondary requirement.
I asked the designer of the ADuM3190 and his response was:
I don’t think the error amplifier in ADuM3190 is ideal for this difference amplifier….
1. Firstly, they need a reference voltage (at the R2 of VB branch) to bias up the output voltage because the output of the error amplifier is poweredby a single supply.
2. The input resistor of R1 must be huge, i.e. >1MOhms, and the input impedance of the ADuM3190 is not big enough though. So the gain and offset errors could be big.
I moved your question to the isolation community. Someone here is more familiar with the device and could give you expert opinion on how you want to use ADuM3190.
Thank you iamPhil
Thanks for your support..
Can you suggest any circuit for the mesurement of the 800 to 900V DC with isolation amplifier?
I asked the designer again and his response:
It is not that straight forward to use ADuM3190 to measure a voltage because the part is lack of features like high input impedance.
I would suggest add another stage as a input stage and level shifter to interface with the ADuM3190. The input stage provide good input performance and gain factor so that the huge common mode voltage can be handled by ADuM3190.
Retrieving data ...