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ADAU1977 slave mode and MCLKIN (pin 7)

Question asked by flatmax on Nov 21, 2013
Latest reply on Nov 25, 2013 by Rajeev

Hi there,


I am wondering about how to connect the MCLKIN line in a circuit for the ADAU1977.


I am planning to drive the chip in slave mode.

In the data sheet reference design for the ADAU1977 (page 65), it suggests the PLL_FILT to be setup using LRCLK values :

R17 4.87kΩ

C20 2200pF

C21 39nF


But my question is, where should I connect MCLKIN ?

Currently I assume that the PLL is not being used and I connect MCLKIN (pin 7) to GND.

Will that work ?

Is there a better place to connect it ?