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.
Synch signal
SINCSCK1
L OUTDataData
DSPCPU
SISOLSI2SISO
LSI1
DAC
Word clockWord clockHG51B277FB
UPD913GF-3BA
IC6
UPD6379GRLRCKWCKOWCKILRCK
R OUTBit clockBit clock
CLKBCKIBCK
FILTER BLOCK
Since the sound signals from the DAC are stepped waveforms, the filter block is added to smooth the
waveforms.
AVDD
AVDD
22 1
FQ110
?+
2SC1740SQ.R
Q107
2SC1740SQ.R
0.01 10 V22 ?
10K10K10KFrom DAC
1K
AG150PF22K10K
AG
To main volume560PF?
2.2K
270PF
18K
AGAGAG
6.3V 1000
AG
N 9 N |