Currently I use the AD629 in a cell voltage monitor (CVM) board for measuring the individual cell voltages in a fuel cell stack with 88 cells. Each one of the 88 cells can produce plus, minus 1v (the minus voltage is the output of the cell if something goes wrong with that particular cell) and all cells are serially connected or the total voltage normally is 88vdc. This op-amp is very good but I still have a question: does AD offer some fully isolated part in order to decouple even better the ADC on my CVM board from the stack voltages, at some reasonable price (up to $10 or so)?
I'll highly appreciate your suggestions!
I moved this question about the AD629 to the Operational Amplifiers community. I'm not sure if ADI offers such a part, but someone here should be able to provide assistance.
EngineerZone Community Manager
The AD629 has one of the highest common mode voltage ratings that we offer. Nothing else we have right now replaces that ... just yet. Your question on isolation is very interesting and you should post that in the Interface and Isolation forum. We have new exciting technologies in Isolation that might help you there. Good luck.
Thanks for the answer,
Basically I have 3 choices: the AD629, the TI component INA149 and the LT op-amp LT1990.
In the past I used exclusively the AD629 and probably will continue to use it.
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