Analog Devices Fanout Buffer: The application information in the LTC6955 datasheet states that the LVDS input connection method is AC coupled and terminated in 160Ω, but is it correct to use 160Ω instead of 100Ω?

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Analog Devices Fanout Buffer: The application information in the LTC6955 datasheet states that the LVDS input connection method is AC coupled with 160Ω termination.

clock & timing

Yes, 160Ω is correct.
For the AC model, the series capacitance is nearly 0Ω, and there are 250Ω differential inside the LTC6955. You can treat it as a parallel resistance of 160Ω and 250Ω, creating a differential 100Ω resistor (160*250/(160_250) = 97Ω (approximately 100Ω)).

(Published in January 2022)

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