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LTC1685 IBIS model

joakimosth
on Oct 4, 2018

Hi!

I like to implement a serie resistor on RO output signal (pin 1) when using 50R transmission lines for good signal integrity. Hence the following questions:

1. Is there any IBIS model available to the LTC1685 transceiver?

2. What is the approximate output impedance of the RO output signal?

Best regards

Joakim

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  • +1
    •  Analog Employees 
    on Oct 8, 2018 2:10 AM

    Hi Joakim:

    unfortunately we do not have IBIS model for this part. A way to roughly estimate the output impedance is via the output logic threshold.

    VOH is specified with VDD=5.0V, Io=4mA, then Ro could be calculated by (5.0 V - 4.8 V) / 4mA = 50 ohm.

    Regards

    Chris

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  • +1
    •  Analog Employees 
    on Oct 8, 2018 2:10 AM

    Hi Joakim:

    unfortunately we do not have IBIS model for this part. A way to roughly estimate the output impedance is via the output logic threshold.

    VOH is specified with VDD=5.0V, Io=4mA, then Ro could be calculated by (5.0 V - 4.8 V) / 4mA = 50 ohm.

    Regards

    Chris

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