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2118 BNC-TTL / 2128 SMA-TTL Isolation spec #49

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opened 2022-07-08 17:10:52 +08:00 by topquark12 · 3 comments
topquark12 commented 2022-07-08 17:10:52 +08:00
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If we put "Galvanically isolated" in the front page features, we should probably provide isolation specs in the datasheet.

If we put "Galvanically isolated" in the front page features, we should probably provide isolation specs in the datasheet.
occheung commented 2022-08-10 17:40:36 +08:00
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There are some example spec from the MAX14434 datasheet.
image
But the isolator is after the I/O transcievers, we really shouldn't be seeing an extreme voltage around the isolator?

There are some example spec from the MAX14434 datasheet. ![image](/attachments/ebe268bc-78b2-4ac7-9fc1-12188200d0bc) But the isolator is after the I/O transcievers, we really shouldn't be seeing an extreme voltage around the isolator?
image.png
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sb10q commented 2022-08-11 10:18:32 +08:00
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There's also a resistor between the power planes which I doubt withstands anything near 5kV, and maybe other things. @topquark12 can you help here?

we really shouldn't be seeing an extreme voltage around the isolator?

The voltage is determined by what the user connects.

There's also a resistor between the power planes which I doubt withstands anything near 5kV, and maybe other things. @topquark12 can you help here? > we really shouldn't be seeing an extreme voltage around the isolator? The voltage is determined by what the user connects.
topquark12 commented 2022-08-15 19:44:24 +08:00
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I think this spec is best tested with a HV insulation tester rather than guesstimated by looking at the spec sheet. Layout features have a big impact on how much voltage the board can actually withstand.

I think this spec is best tested with a HV insulation tester rather than guesstimated by looking at the spec sheet. Layout features have a big impact on how much voltage the board can actually withstand.
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