Toshiba TLP-510U Manuale di formazione tecnica - Pagina 38
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7-3-7. Audio Circuit
Fig. 7-3-12 shows the audio circuit block diagram.
Signal path from the QV001 to the LINE OUT terminal
is: QV001 ® transistor buffer ® LINE OUT terminal.
Signal path from the QV001 to the speaker is as follows.
The audio signal developed from the QV001 becomes
one signal with its L and R signal components mixed.
The mixed audio signal enters the electrical volume IC
QA01 (M5222FP) and the output level is controlled
within a range of about 0 dB to –80 dB by an external
DC voltage (DAC). The audio signal thus controlled by
the IC QA01 is fed to the speaker amplifier IC QA02
(TDA7056A) and amplified by about 36 dB to drive the
speaker.
VIDEO
L
R
QV001
INPUT SELECTOR
RGB
L
CXA1855Q
R
LINEOUT
R
BUFFER
L
BUFFER
VOLUME
DAC
MUTE
CXA1315M
Fig. 7-3-12 Audio circuit block diagram
QA01
M5222FP
VOL / MUTE
QA02
TDA7056A
SPEAKER
SOUND OUT
1.5W
7-11