An alternative to the obsolescent CS42448: the PCM3168

[h4yn0nnym0u5e]

Hi there. May I ask the benefit of using all 4 OUTs and like 3 INs for 8 Out/6 In instead of just using 1 OUT and 1 IN and then in TDM mode for 8Out/IN? (Except for that it can't run 96kHz then but for 44.1/48/24bit)

I can’t think of a good reason not to use TDM … but because the PCM3168 is capable of using I2S I catered for it on my proof-of-principle design. Which then came in handy when trying out 96kHz audio…

Of course you can’t actually have 4 OUTs and 3 INs, as SAI1 only has 5 pins, and only 4+1, 3+2, 2+3 and 1+4 are valid combinations. So, even less useful!

Oh, I just thought of a use case. It’s possible to derive the audio system clock from an incoming S/PDIF stream, but only for I2S; the TDM option needs a clock twice the speed of the recovered clock. Still not very convincing.

 

[derTom]

I can’t think of a good reason not to use TDM … but because the PCM3168 is capable of using I2S I catered for it on my proof-of-principle design. Which then came in handy when trying out 96kHz audio…

Of course you can’t actually have 4 OUTs and 3 INs, as SAI1 only has 5 pins, and only 4+1, 3+2, 2+3 and 1+4 are valid combinations. So, even less useful!

Oh, I just thought of a use case. It’s possible to derive the audio system clock from an incoming S/PDIF stream, but only for I2S; the TDM option needs a clock twice the speed of the recovered clock. Still not very convincing.

Nice thanks. So TDM via 1 In/Out it is for 8/6 and I save some pins. Perfect