Microphone - LG W3000 Service Manual

3. TECHNICAL BRIEF

3.13 Microphone

The microphone is placed to the front cover and contacted to main PCB. The audio signal is passed
to VINNORP (#J10) and VINNORN (#K10) pins of AD6522. The voltage supply 2V45_VAN is output
from ADP3408, and is a bias voltage for both the VINNORP (through R101) and VINAUX (through
R112) lines. The VINNOR or VINAUX signal is then A/D converted by the Voiceband ADC part of
AD6521. The digitized speech is then passed to the DSP section of AD6522 for processing (coding,
interleaving etc.).
Figure 3-37. Microphone.
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