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SN3257-Q1: Can I use 2x SN3257 to support 5 bit I2S signal? Will running with a 50MHz clock through a different IC cause latency gap issue?

Adam Torma
Mastermind 45575 points
Part Number: SN3257-Q1
Other Parts Discussed in Thread: TS3A27518E

e2e, 

I'm looking for a 5bit I2S selector(MCLK, LRCLK, BCLK, DIN and DOUT). Originally the request was 4bit, I used SN3257-Q1, but now need 5bits. 

Below is the requirements. Could you suggest the best solution?

  • Clock frequency is less than 50MHz
  • Need EN function.(floating output)
  • As small as possible.(2pcs of SN3257-Q1 is one of candidate because mixing two device makes latency gap)

Thank you, 

Adam

  • 0
    TI__Guru 52332 points

    Hi Adam,

    Using 2 SN3257-Q1's is an option that will work fine for the application. I would not mix two different devices as this can cause slight differences in signal performance depending on the IC due to different specifications. But using 2 SN3257-Q1 has no concerns for the application. 

    If only one chip is desired  the TS3A27518E-Q1  is another option - it was designed for QSPI applications but can support I2S applications. It has 6 channels so it can support all  lines. 

    This device has an enable pin as well. It is specified at 1.8V / 2.5V / and 3.3V supplies.

    As for sizing - 2 SN3257's (SOT-23-THN Package)  have the same layout size as 1 TS3A27518E (in the WQFN package) at 16mm^2 - but the 1 chip solution will be slightly smaller in practice due only 1 IC and only 1 decoupling capacitor.

    If you have any other questions please let me know!

    Best,

    Parker Dodson