How to connect unused ADAU1781 pins?


my ADAU1781 project use neither the mic inputs nor stereo line out nor the beep input.

Question: may I left LMIC, LMICP, RMIC, RMICP, BEEP, AOUTL, AOUTR unconnected?

I just saw, that LMICP and RMICP can be directly feed from CM, so the question remains for other pins.

Thank you!

Florin Petrov

  • 0
    •  Analog Employees 
    on Jun 28, 2016 11:39 PM

    Hello Florin,

    The AOUTL and AOUTR you can leave floating. If you must not leave pins floating because of your application then tie a 10K to ground.

    All the other pins are analog input pins and can be tied to CM. For the pins that are multiplexed as a digital mic input, you should not select the digital mic mode in the registers.


    Dave T