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ISO7420FCC: Carrier frequency and PWM block of LF side

masahiko shimizu
Guru 11235 points
Part Number: ISO7420FCC
Other Parts Discussed in Thread: ISO7720, ISO7420

Hi,

Customer has two questions below.
Could you answer me, please?

Q1:How fast is the carrier frequecy of LF side?
Q2:Can you tell me the operation of PWM block of LF side?
I think the same of ISO7720. is it correct?
If my idea correct, How does PWM block detect input logic of High/Low?

Customer has a issue at noise insertion test.
It is that voltage waveform is not same between input and output.
He wants to know to consider this issue.
Signal is about 100bps.

Best regards,
Shimizu

  • 0
    TI__Intellectual 2900 points

    Hi Shimizu,

    ISO7420 is an older generation device and ISO7720 is our latest digital isolator family. The architecture which has been used within the IC is also significantly different. Please refer to Digital Isolator Design Guide Section 1 for additional details on the architecture used within the ICs.

    Can you please suggest customer to try the same experiment on ISO7720 IC? The ISO77xx family is more robust to EMC/EMI noises such as the noise insertion test.

    Regards,
    Anand Reghunathan