Audio Interface - LG -T500 Service Manual

3. TECHNICAL BRIEF

3.12 Audio Interface

3.12.1 Functional Overview
The audio front-end of X-GOLD™215 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™215. 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™215. 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.
Figure 3.12.1 Audio Section Overview
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