LG KG270 Service Manual - Page 32
Audio Interface
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3. TECHNICAL BRIEF 3.10 Audio Interface K14 LOUD2 L15 LOUD1 VMIC P12 MICP2 P11 R12 MICN2 MICP1 P15 R13 MICN1 M14 EPPA1 EPP1 M12 EPN1 N15 SPK_N SPK_P VMIC AUXIP AUXIN VINNORP VINNORN EPPA1 REC_P REC_N C124 1000p Figure 3-10-1 Audio interface The audio front-end of E-GOLDvoice offers the digital and analog circuit blocks for both receive and transmit audio operation and ringing. It features a high-quality, digital-to-analog path with amplifying stages for connecting acoustic transducers to the E-GOLDvoice. In the transmit direction the supply voltage generation for microphones, low-noise amplifier and analog to digital conversion are integrated on the E-GOLDvoice. For E-GOLDvoice the EPp1/EPn1 driver are used as differntial Earpiece-Driver, EPPa1 is used as single-ended Headset-Driver. The audio front-end itself can be considered to be organized in three sub-blocks: • Interface to processor cores (TEAKlite and - indirectly - C166S) • Digital filters • Analog part. - 33 -
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