Casio CTK-630 Manuale Utente
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AVDD
470
AG
AG
1K
1K
1K
C333(H)
C332(H)
2SC1740SQ
1K
AG
AG
2SC1740SQ
AVDD
47K
22K
50V0.22
µ
10V22
µ
From the DAC
To main volume
Synch signal
Data
Word clock
Bit clock
Data
Word clock
Bit clock
DSP
LSI101
HG51B227FB
DAC
IC102
UPD6379GR
CPU
LSI105
UPD912GF-3BA
L OUT
R OUT
SI
LRCK
CLK
SO
WCKO
SCK1
SO
LRCK
BCK
SINC
SI
WCKI
BCKI
DAC (IC102: 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.
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.
Pin No.
Terminal
In/Out
Function
50
VSS3
In
Ground (0 V) source
58
EA13
Out
Not used
60
EWEB
Out
Write enable signal output for the effect RAM
61
EA14
Out
Not used
62, 66, 70, 74, 78
VSS2
In
Ground source
63, 67, 71, 75, 79
VDD2
In
+5 V source
64, 65, 68, 69,
72, 73, 76, 77
PA0 ~ PA7
Out
LED segment signal output
FILTER BLOCK
Since the sound signals from the DAC are stepped waveforms, the filter block is added to smooth the
waveforms.
waveforms.