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SN65MLVD047: I2S extension function for 800mm cable applicaiton

Gary Teng
Genius 5840 points
Part Number: SN65MLVD047

Tool/software:

Hi Sir,

 My customer need to extend its I2S length to 800mm for linking their two PCB boards. Are SN65MLVD047/48 good for 1.8V I2S application? Or any other suggestion for I2S buffer? Thanks for your kindly help.

Regards,

Gary Teng

  • 0
    TI__Guru 52282 points

    Hi Gary,

    These devices have LVTTL single ended inputs - so 1.8V signaling would not be read by the M-LVDS devices correctly. 

    You would need level translators before and after in the following flow:

    I2S -> 1.8V to 3.3V -> M-LVDS quad Driver -> M-LVDS bus -> M-LVDS quad Receiver -> 3.3V to 1.8V -> I2S

    It would be able to do the length extension - but we don't have any 1.8V devices that will work (our 1.8V devices are serializers and a couple receivers - but no transmitters) 

    I am going to loop in our level translator team to see if we can pair the M-LVDS devices with a translator to meet the goals of the application. 

    If you could also let us know what speed you are aiming for - the M-LVDS devices chosen are rated to 200Mbps - but if your I2S signal is slower than that please let us know so it can potentially increase the potential matches for what you need. 

    Best,

    Parker Dodson

  • 0
    TI__Mastermind 22930 points

    Hello Gary,

    Correct me if I'm wrong here but I2S is a 3-wire interface. If that's correct, then I would recommend the SN74AXC4T245 which supports 200Mbps and 1.8V <-> 3.3V translation.

    Regards,

    Josh