LG KE600 Service Manual - Page 49
Audio amplifier sub system IC with 3D effect
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3. TECHNICAL BRIEF 3.13.1. Audio amplifier sub system IC with 3D effect Audio amplifier sub system IC is an audio power amplifier capable of delivering 540mW of continuous average power into a mono 8ߟ bridged-tied load(BTL) with 1% THD+N, 35mW per channel of continuous average power into stereo 32ߟ single-ended (SE) loads with 1% THD+N from a 3.3V Power supply. The LM4946 features a 32-step digital volume control and eight distinct output modes. The digital volume control, 3D enhancement, and output modes (mono/SE/OCL) are programmed through a two-wire I2C interface that allows flexibility in routing and mixing audio channels. VBAT 2V85_IO2 C306 C357 4.7u 0.1u 1u C304 FB309 FB310 C310 C311 22p 22p OUT301 OUT302 D309 PG05DBTFC D310 PG05DBTFC GND1 4 GND2 12 20 GND3 3 VDD1 16 VDD2 PGND 25 SCL SDA TP304 TP303 R309 100K 11 SCL 10 SDA 13 ID_ENB 2 VOC 7 I2CSPI_VDD 14 I2CSPI_SEL C369 0.1u U301 LM4946SQX 21 CBYPASS 18 LHP3D1 1 LHP3D2 C323 0.068u C320 0.01u C358 2.2u 9 LIN C313 6 LOUT 23 C361 220n MONO_IN+ 22 C362 220n MONO_IN- 15 MONO+ MONO- 17 RHP3D1 19 24 RHP3D2 0.068u C324 8 C312 220n RIN 5 ROUT SNDOUT_L SNDOUT_R C317 47p C316 47p AMP_IN_R AMP_OUT_R AMP_OUT_L 220n AMP_IN_L Figure 23 Audio amplifier Sub-system IC AMP_IN_L FM_MAIN AMP_IN_R 2V85_IO2 U302 9 8 1A 1S 7 6 2S 2A R331 100K 5 GND VCC 10 C329 0.01u 1 1B0 2 1B1 3 2B0 2B1 4 R327 0 R330 0 FSA2267L10X SNDOUT_L FM_L SNDOUT_R FM_R Figure 24 Audio signal distribute analog switch - 50 -
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