CASIO CTK601
Instrukcja Serwisowa

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 SINC L OUT DAC IC6 UPD6379GR R OUT SI Word clock LRCK WCKO Bit clock CLK
2.2K 0.01 µF

SCK1 Data SO CPU LSI1 UPD913GF-3BA

Data SO DSP LSI2 HG51B277FB SI

Word clock WCKI LRCK Bit clock BCKI BCK

FILTER BLOCK
Since the sound signals from the DAC are stepped waveforms, the filter block is added to smooth the waveforms.

AVDD Q107 2SC1740SQ.R

AVDD

22 �

Q110 2SC1740SQ.R 10K 150PF 270PF 10K

+

10 V22 µ 22K 1K 6.3V 1000 µ

10K 560PF

From DAC

AG

To main volume
AG AG

AG 18K 10K AG

AG

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