Filter Block - Casio WK-1200 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
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
10 V22 µ
AG
To main volume
Data
SO
SI
Word clock
HG51B277FB-1
WCKO
LRCK
Bit clock
CLK
Q308
1 K 1 K
0.015 µF
AG AG
AG
— 10 —
Synch signal
SINC
Data
DSP
SI
LSI2
Word clock
WCKI
Bit clock
BCKI
Q310
1 K
AVDD
AG
AG
SCK1
CPU
SO
LSI1
GT-913F
LRCK
BCK
22 µF
From DAC
AG