Filter Block - Casio CPS-85 Service Manual

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
LSI6
UPD6379GR
R OUT

FILTER BLOCK

Since the sound signals from the DAC are stepped waveforms, the filter block is added to smooth the
waveforms.
To main volume
15 V10
L
15 V10
To main volume
R
Data
SO
SI
Word clock
HG51B277FB
WCKO
LRCK
Bit clock
CLK
AVCC
C472(H)
6
–
8
7
2
10 K
5
+
4
AG AG
M5218APR
(1/2) 2
IC104
C472(H)
2
–
1
2
10 K
3
+
AG
— 8 —
Synch signal
SINC
Data
DSP
SI
LSI1
Word clock
WCKI
Bit clock
BCKI
10 K 10 K
AG
2.2 K
AVCC
AG
10 K 10 K
AG
SCK1
CPU
SO
LSI4
GT913F
LRCK
BCK
Left
10 F
From DAC
Right
10 F
From DAC