Hello,
I have a DAC with 3 digital inputs (coaxial,Toslink,USB) with WM8805 receiver, I would like to know please if I can split the output of the WM8805 I2S with another DAC so the 2 DACs will receive the same I2S signal at the same time?
Can I just connect the I2S output from the WM8805 to the 2nd DAC or do I need something more complicated than simple connection?
Thanks
I have a DAC with 3 digital inputs (coaxial,Toslink,USB) with WM8805 receiver, I would like to know please if I can split the output of the WM8805 I2S with another DAC so the 2 DACs will receive the same I2S signal at the same time?
Can I just connect the I2S output from the WM8805 to the 2nd DAC or do I need something more complicated than simple connection?
Thanks
It is also good practice to have some series resistors in the I2S lines. Something like 47Ohm will be a good start.
What is the purpose of the 47ohm resistors?
Is it a "must to do"?
Preventing/reducing signal reflections for high speed signals, and controlling rise/fall times and damping ringing. They usually go just before the chip inputs. No its not a must, as I2S is quite slow by logic standards - except MCLK if present. At 100MHz+ its highly important to have carefully controlled impedances on the logic traces which act as transmission lines at these speeds. At those speeds LVDS is commonly used too.
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