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ISO7741DBQEVM: Simulation Model is not working. Signal Transfer Bandwidth Parameter Calculation.

Ashish NAWANI
Intellectual 255 points
Part Number: ISO7741DBQEVM
Other Parts Discussed in Thread: ISO7741, PSPICE-FOR-TI

Hello,

The following questions are:-

1. I want to calculate signal transfer bandwidth for the Digital isolator- ISO7741 but the parameters are missing from the datasheet.

2. The PSPICE simulation model available for ISO7741 is not working. It is giving as : Can't find the definition of model "DBREAK".

Simulation software: LT-SPICE.

Thanks and Regards

Ashish Nawani

  • 0
    TI__Guru 55665 points

    Hi Ashish,

    Thanks for reaching out. Please see my inputs below,

    Ashish NAWANI said:
    1. I want to calculate signal transfer bandwidth for the Digital isolator- ISO7741 but the parameters are missing from the datasheet.

    Could you please let me know what parameters are you looking at? The data channels of ISO7741 are designed and tested to guaranteed support for a datarate of 100Mbps. Since the datarate itself is a spec in datasheet, I do not believe there is any other parameter needed to calculate data transfer bandwidth. The device may be able to accept signals that are faster than 100Mbps but we only guarantee device performance for up to 100Mbps across temperature, voltage and devices.

    Ashish NAWANI said:

    2. The PSPICE simulation model available for ISO7741 is not working. It is giving as : Can't find the definition of model "DBREAK".

    Simulation software: LT-SPICE.

    Please note that the PSpice transient model developed for ISO7741 is designed to work with PSPICE-FOR-TI and it might not necessarily work with LT-SPICE. Hence, I recommend you to use PSPICE-FOR-TI for simulating ISO7741. TI does offer a free version of PSPICE-FOR-TI, you can place a request at the below. Most requests are approved immediately.

    https://www.ti.com/tool/PSPICE-FOR-TI

    Let me know if you have any further questions, thanks.


    Regards,
    Koteshwar Rao

  • 0 in reply to Koteshwar Rao
    Intellectual 255 points

    Hi Koteshwar,

    1. I am looking for the range of frequencies it will allow to pass or reject (min and maximum range).

    2. I will try that in pspice tool.

    Thanks and Regards

    Ashish Nawani

  • +1 in reply to Ashish NAWANI
    TI__Guru 55665 points

    Hi Ashish,

    Please see my inputs below.

    Ashish NAWANI said:
    1. I am looking for the range of frequencies it will allow to pass or reject (min and maximum range).

    Thanks for the quick clarification. The guaranteed datarate is up to 100Mbps (50MHz) and hence, all the signals with frequencies up to 50MHz are guaranteed to be passed through the data channel as per the Function Table defined in the datasheet. There is no minimum frequency requirement spec for device and hence the frequency can also be 0 Hz i.e., DC signal.


    Regards,
    Koteshwar Rao