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DAC (IC1: 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.
L OUT
DAC
IC1
UPD6379GR
R OUT
FILTER BLOCK
Since the sound signals from the DAC are stepped waveforms, the filter block is added to smooth the
waveforms.
AVDD
AG
50V22
C340
To main volume
50V22
C341
Data
SO
SI
Word clock
HG51B277FB
WCKO
LRCK
Bit clock
CLK
Q308
3.3K
4.7K
1K
R336
R337
R338
C343
C123H
AG
AG
Q309
3.3K
4.7K
1K
R342
R343
R344
C346
C123H
— 9 —
Synch signal
SINC
Data
DSP
SI
LSI2
Word clock
WCKI
Bit clock
BCKI
Q310
AVDD
50V22
C349
AG
Q311
50V22
AG
AG
C350
SCK1
CPU
SO
LSI1
GT913F(T)
LRCK
BCK
From DAC
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