2.11 Analog Microphone Inputs
The differential microphone input circuit and the placement rules are listed below:
- The DC blocking capacitors (C21 and C34) are placed as close as possible to IS2083BM.
- The MIC_BIAS filtering components (R6 and C22) are placed close to the microphone.
- The microphone and signal paths of microphone must be routed on same layer.
- Components on differential paths (MICP1, MICN1, MIC_P1 and MIC_N1) must be placed close to each other to reduce common mode noise.
Note:
- If single microphone is used, change R10 from 2 kΩ to 0Ω.
- Connect MICP1 with microphone positive side and MICN1 to microphone ground.