LG GB220 - Audio Front-End

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LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3. TECHNICAL BRIEF
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
3.12 Audio Front-End
Figure 3.12.1 Audio Section Overview
3.12.1 Functional Overview
The audio front-end of X-GOLD™213 offers the digital and analog circuit blocks for both receive and transmit
audio operation, from a mobile phone perspective (called audio-in and audio-out subsequently). It features a
high-quality, stereo digital-to-analog path with amplifier stages for connecting acoustic transducers to
XGOLD™213. In audio-in path the supply voltage generation for electret microphones, a low-noise amplifier
andanalog to digital conversion are integrated in X-GOLD™213. A more detailed functional description will be
given in the following sections.
The audio front-end itself can be considered to be organized in three sub-blocks:
• Interface to processor cores (TEAKLite® and - indirectly - ARM)
•Digital filters
•Analog part
The following figure shows an architecture overview of the Audio section.