Read Panasonic KX-TCA175RU Service Manual online
9
KX-TCA175RU
4.2.5.
TX Audio Path
Microphone
An audio signal from microphone is input to pin 118 (MIC+) of IC3 via headset jack (CN1).
In IC3, the audio signal is converted from the analog signal to ADPCM, then to burst data, and sent from pin 28 (TXDA) to RF
Module. The stabilized supply voltage is fed to the microphone from pin 119 (VREF+) of IC3.
To reduce consumption current, this voltage is supplied only while calling or receiving.
In IC3, the audio signal is converted from the analog signal to ADPCM, then to burst data, and sent from pin 28 (TXDA) to RF
Module. The stabilized supply voltage is fed to the microphone from pin 119 (VREF+) of IC3.
To reduce consumption current, this voltage is supplied only while calling or receiving.
Headset
When a headset is inserted, a signal from microphone is cut off and an audio signal from a headset is input to pin 118 (MIC+).
Headset detection
When a headset is inserted, pin 41 (ADC2) of IC3 goes from Low to High (around 1V) and BBIC (IC3) detects the insertion of
the headset.
the headset.
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