PCM182x EVM/PCM182xQ1 EVM has two onboard differential microphones that can be routed to the inputs with jumpers. The microphones require a bias be applied to MPWR. MPWR can be tied to AVDD on J4, or to MICBIAS if using a device that supports this feature. Note that the PCM182x/PCM182x-Q1 do not have an integrated MICBIAS and this option is provided for future devices that might incorporate this feature. The following jumpers need to be installed to use the onboard mics: J4, J11,J12, J14, J15, J16, and J21.

If the onboard mics are used, leave the J1 and J2 headers unconnected to preserve the microphone performance.