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ISO7640FM: I2S isolation

Vincenzo Pizzolante
Mastermind 22746 points
Part Number: ISO7640FM

hi

I would like to implement isolated I2S communication with master clock from oscillator and I want to ask you for some advices about it.

I found ISO7640 which is 150Mbps, but I am not sure whether 98,304MHz master clock on input will be ok on output, because 2nd and 3rd harmonic will be missing but for 49,152MHz oscillator should be fine.

Any other idea how to implement isolated I2S (for professional audio apps)?

thansk a lot in advance

KR

Vincenzo

  • 0
    TI__Mastermind 49445 points
    Hi Vincenzo,

    A 98.304MHz clock is going to have a datarate of 196.608 Mbps which is higher than the max datarate that ISO7640 supports, hence the device will not be able to support 98.304MHz input.

    Since these are digital inputs, the data/clock produced at the output of ISO7640 will have rise/fall times as per device specifications in datasheet. Since the output signal is going to have much sharper rise/fall times, it will contain many harmonics including the 2nd and 3rd harmonics.

    Currently we do not have any device with datarate >150Mbps, hence our isolators will not be able to support 98.304MHz input. Thanks.


    Regards,
    Koteshwar Rao
  • 0 in reply to Koteshwar Rao
    TI__Mastermind 22746 points
    hi all,

    It will be a new Creek power amplifier with DAC and USB input.
    Level of isolation is not very important, as we just need to separate the noise from the digital parts, so the signals to the DAC will be clean.

    KR
    Vincenzo
  • 0 in reply to Vincenzo Pizzolante
    TI__Mastermind 49445 points
    Hi Vincenzo,

    I understand that isolation specifications are not critical. Unfortunately, we don't have any isolator that supports >150Mbps of datarate. Hence, the 98.304MHz clock can't be transmitted reliably to the output by any of our isolators. Let me know if you have any questions, thanks.


    Regards,
    Koteshwar Rao