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2.2K
270PF
560PF
0.01 µF
AG AG AG
AG
AG
22 Ω
Q110
2SC1740SQ.R
AG
AVDD
AVDD
10K
18K
6.3V 1000 µ
22K
1K
Q107
2SC1740SQ.R
10 V22 µ
From DAC
To main volume
+
10K10K10K
150PF
Synch signal
Data
Word clock
Bit clock
Data
Word clock
Bit clock
DSP
LSI2
HG51B277FB
DAC
IC6
UPD6379GR
CPU
LSI1
UPD913GF-3BA
L OUT
R OUT
SI
LRCK
CLK
SO
WCKO
SCK1
SO
LRCK
BCK
SINC
SI
WCKI
BCKI
FILTER BLOCK
Since the sound signals from the DAC are stepped waveforms, the filter block is added to smooth the
waveforms.
DAC (LSI6: UPD6379GR)
The DAC receives 16-bit serial data output from the DSP. The data contains digital sound data of the
melody, chord, bass, and percussion for the right and left channels. The DAC converts the data into
analog waveforms and output them to each channel separately.
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