Audio Front-End - LG A175 Service Manual

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3. TECHNICAL BRIEF

3.11 Audio Front-End

3.11.1 Functional Overview

The audio front-end of X-GOLD™ 110 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™ 110. 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™ 110. 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 3.11.1 Audio Section Overview

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