Part Number: DS25CP102
Other Parts Discussed in Thread: LMH0344, , DS25CP104A
Hi TI team,
I have a follow-up question about DS25CP102TSQ input biasing when AC coupling is used.
I referred to these previous E2E threads:
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DS25CP102 receiving output from LMH0344
DS25CP102 / Receiving output from LMH0344 - Interface forum - Interface - TI E2E support forums
My understanding is that if no voltage is observed on IN+/- with only VCC applied, an external bias circuit is required, and for successful AC coupling, the external bias should be within the device common-mode range. -
DS25CP104A external bias circuit
DS25CP104A - External bias circuit - Interface forum - Interface - TI E2E support forums
My understanding is that when AC coupling is used, the input common-mode range at each pin should be satisfied by the applied bias.
Based on this, I understand that AC coupling without external bias is not a recommended operating condition.
My question is about the following case:
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AC coupling is used
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no external bias is added
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the input common-mode is therefore near 0 V
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each input pin voltage still remains within the Absolute Maximum Rating for LVDS Input Voltage (-0.3 V to +4 V)
In this condition, can this cause physical damage to the DS25CP102TSQ device itself?
Or should this be understood only as a functional/specification issue, meaning that correct operation is not guaranteed, but device damage is not expected as long as the Absolute Maximum Rating is not violated?
I would appreciate TI’s clarification on whether this condition should be treated as:
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operation not guaranteed only, or
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possible device damage risk.
Best regards,
Diego
