Audio Front-End - LG GX300 Service Manual

3. TECHNICAL BRIEF

3.13 Audio Front-End

3.13.1 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 X-GOLD™213. In audio-in path the supply voltage generation for electret microphones, a
low-noise amplifier and analog 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.
LGE Internal Use Only
Figure 3.13.1 Audio Section Overview
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1. TECHNICAL BRIEF
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