Audio Processing Circuit - Cambridge Audio Azur 752BD Service Manual

Section Three Audio processing circuit
3.3.1 Block diagram of audio signal is shown in figure 3.3.1.1:
Decoding
COAXIAL_IN
chip
USBDAC_CIAXIAL_IN
OPTICAL_IN_ARC_
MVL_OPTICAL_IN
DATA_LF_RF_MTK
DATA_LS_RS_MTK
BCLK_MTK
LRCK_MTK
DATA_C_SW_MTK
DATA_LSB_RSB_MTK
DATA_LDOWNMIX_RD
OWNMIX_MTK
12
U4
SN74CBT3257
ARC_MVL_OPTICAL_IN
AO2SI2S_BCK
AO2SI2S_LRCK
AO2SI2SD0(MLR)
AO2SI2SD1(SURLR)
AO2SI2SD2(CSW)
AO2SI2SD3(SURBLR)
SPDIF2
OPTICAL_IN_ARC_MVL
SPDIF_OUT
TX2+/TX2-/TX1+/TX1-/TX0+/TX0-/TXC+/TXC-
MCLK_MTK
SLRCK_DSP
SBCLK_DSP
DSP
SDATA,_L_RDOWNMIX_ DSP
ADSP
SDATA_LSB_RSB_DSP
-21261
SDATA_C_SW_DSP
SDATA_LS_RS_DSP
SDATA_LF_RF_DSP
Audio
processing
board
Figure 3.3.1.1 Block diagram of audio signal
-10-
COAXIAL_IN
COAXIAL/OPTICAL
INPUT BOARD
OPTICAL_IN
U33
88DE2755
SBCLK_DAC
SLRCK_DAC
SDATA_LF_RF_DAC
SDATA_LS_RS_DAC
SDATA_C_SW_DAC
SDATA_LSB_RSB_DAC
SDATA_LDOWNMIX_RDOWNMIX_DAC
DAC1~DAC5_MCLK
LEFT_DOWNMIX
RIGHT_DOWNMIX
LEFT_FRONT
RIGHT_FRONT
CENTER
SW
LS
RS
SBL
SBR
Output
COXIAL
INPUT
OPTICAL
INPUT
HDMI2_TX2+
HDMI2_TX2-
HDMI2_TX1+
HDMI2_TX1-
HDMI2_TX0+
HDMI2_TX0-
HDMI2_TXC+
HDMI2_TXC-
COXIAL
OPTICAL
HDMI2
U17/U20/
U23/U23/
U26
D/A
converter
Wm8740
U18
U19
U21
U22
U24
U25
U27
U28
U30
U31
Amplifier