unpowered input voltage

I need to withstand full input voltage with power off. i.e. input V still there when unpowered. I am using ad8422

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  • we are building a multi-channel battery tester. It is a large unit with many channels and test procedures running. It could be (and will be) powered down, by the customer, while still connected to a battery it is monitoring.We can ask them not to do that but they will.  It is required that the circuitry handle this.There will be a series stack of these test batteries totaling up to 1300v.(Hard to believe people want a 1300v battery, but I guess they do) The individual channel's voltage will be +20v at the board input but divided such that the AD8422 sees < 5v. Each of these channels must be isolated to allow the large common mode voltage (up to 1300v) to be removed. I was wanting to use the Adum6402 series but I dont think it will cover that high of a isolation working voltage. But I stray from the point. Anyway I must protect the front end.

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  • we are building a multi-channel battery tester. It is a large unit with many channels and test procedures running. It could be (and will be) powered down, by the customer, while still connected to a battery it is monitoring.We can ask them not to do that but they will.  It is required that the circuitry handle this.There will be a series stack of these test batteries totaling up to 1300v.(Hard to believe people want a 1300v battery, but I guess they do) The individual channel's voltage will be +20v at the board input but divided such that the AD8422 sees < 5v. Each of these channels must be isolated to allow the large common mode voltage (up to 1300v) to be removed. I was wanting to use the Adum6402 series but I dont think it will cover that high of a isolation working voltage. But I stray from the point. Anyway I must protect the front end.

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