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Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3. TECHNICAL BRIEF
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3.10 Microphone
The microphone is placed to the Rear cover and contacted to main PCB. The audio signal is passed to
VINNORP and VINNORN pins of AD6721. The voltage supply VMIC is output from AD6721, and is a
biased voltage for the VINNORP. The VINNORP and VINNORN signals are then A/D converted by the
voiceband ADC part of AD6721.The digitized speech (PCM 8KHz ,16KHz) is then passed to the DSP
section of AD6721 for processing (coding, interleaving etc).
3.11 Main Speaker
Figure 3-12. Connection between Microphone and AD6721
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