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highlight limitations of isolated TTL cards #67

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opened 2024-11-16 10:52:02 +08:00 by sb10q · 4 comments
sb10q commented 2024-11-16 10:52:02 +08:00
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These tend to surprise and confuse users and give them an overly poor impression of ARTIQ systems:

Recommend the non-isolated cards instead.

These tend to surprise and confuse users and give them an overly poor impression of ARTIQ systems: * Jitter from the isolator * Radiated EMI via the cable shields from the isolated grounds, getting picked up elsewhere: https://github.com/sinara-hw/Fastino/issues/94 Recommend the non-isolated cards instead.
sb10q closed this issue 2024-12-30 11:42:49 +08:00
sb10q reopened this issue 2024-12-30 11:42:55 +08:00
sb10q commented 2024-12-30 11:43:15 +08:00
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Jitter issue remains.

Jitter issue remains.
architeuthis commented 2025-01-24 22:43:34 +08:00
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Jitter issue remains.

i.e. jitter is itself an issue or it's not clear enough in the datasheets? The line is "Note that isolated TTL cards are less suited to low-noise applications as the isolator itself injects noise between primary and secondary sides."

> Jitter issue remains. i.e. jitter is itself an issue or it's not clear enough in the datasheets? The line is "Note that isolated TTL cards are less suited to low-noise applications as the isolator itself injects noise between primary and secondary sides."
sb10q commented 2025-01-27 13:40:05 +08:00
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Jitter and EMI are separate issues.

There are two "isolators". One is the DC-DC converter that powers the user connector side, and which is primarily responsible for the radiated noise. The other one is the signal isolator, which transfers the logic levels between the two power domains, and introduces jitter on the signals while doing so.

Jitter and EMI are separate issues. There are two "isolators". One is the DC-DC converter that powers the user connector side, and which is primarily responsible for the radiated noise. The other one is the signal isolator, which transfers the logic levels between the two power domains, and introduces jitter on the signals while doing so.
architeuthis commented 2025-01-29 21:55:16 +08:00
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Ok. Note revised in #77, hopefully clearer/more accurate.

Ok. Note revised in #77, hopefully clearer/more accurate.
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Reference: sinara-hw/datasheets#67
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