— 10 —
DAC (IC11: UPD6376GS)
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 by each channel and output them separately.
The following table shows the pin functions of IC11.
CRDB
CWRB
CKI
CCSB
CD0
CD7
CA0 ~ CA2
First contact
Second contact
KC0
KC7
FI0
FI7
SI0
SI7
Key input signal
Key scan signal
~
~
Data bus
Address bus
Key Controller
LSI16
HG52E35P
Keyboard
FI
SI
KC
RDAB
WRAB
CLKA
HGB
RESET
RESB
LSI17
µ
PD65611GB
KEY CONTROLLER (LSI16: HG52E35P)
The key controller generates key scan signals and provides them to the keyboard. By counting the time
between first-key input signal FI and second-key SI from the keyboard, the key controller detects key
velocity. The note number and its velocity data are read at regular intervals by the CPU.
Pin No.
Terminal
I n / O u t
Function
1
SEL
In
Mode selection terminal. Connected to ground.
2
D.GND
In
Ground (0 V) source for the internal digit circuit
3
NC
—
Not used
4
DVDD
In
+5 V source for the internal digital circuit
5
A.GND
In
Ground (0 V) source for the right channel
6
R.OUT
Out
Right channel sound waveform output
7, 8
A.VDD
In
+5 V source for the internal analog circuit
9
R.REF
In
Right channel reference voltage terminal
10
L.REF
In
Left channel reference voltage terminal
11
L.OUT
Out
Left channel sound waveform output
12
A.GND
In
Ground (0 V) source for the left channel
13
LRCK
In
Word clock input
14
LRSEL
In
Not used. Connected to ground.
15
SI
In
Sound data input
16
CLK
In
Bit clock input
Содержание CTK-680
Страница 1: ...GM SOUND KEYBOARD CTK 680 CTK 680...
Страница 18: ...18 SUB PCB JCM716 MA2M...
Страница 19: ...19 CONSOLE PCB M716 CN1M...
Страница 20: ...20 KEYBOARD PCBs JCM617T KY1M KY2M...
Страница 21: ...21 EXPLODED VIEW 14 13 12 12 4 5 16 17 19 21 22 23 20 7 9 8 6 18 24 15 3 1 R 1 R 3 R 2 11 10 10 2...
Страница 25: ...MA0100271A...
