Yamaha YMC-700 Service Manual page 60

YMC-700/YMC-500
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• Microprocessor ADC select port
IC381: ADC084S021 CIMM (DIGITAL P.C.B.)
4-channel, 200 kSPS, 8-bit A/D converter
IN1
IN2
IN3
IN4
AD converter
Pin No.
1
2
3
4
5
TE
L 13942296513
6
7
8
9
10
Destination detection for A/D port
Pull-up resistance 10 k-ohms
KEY1
Ohm
A/D value (3.3 V=255)
KEY1 (7 pin of IC381)
KEY2
Ohm
A/D value (3.3 V=255)
KEY2 (6 pin of IC381)
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8-Bit
SUCCESSIVE
MUX T/H
APPROXIMATION
ADC
GND
CONTROL
LOGIC
Port Name Function Name
CS
VA
GND
IN4
IN3 PWR_PRV1
IN2 KEY_INTPUT2
IN1 KEY_INTPUT1
DIN
DOUT
SCLK
0
V 0 – 0.05
0 – 4
〈 (LEFT)
0
V 0 – 0.05
0 – 4
CONTROL
x ao
y
i
8
V A
CS 1
V A 2
GND
ADC084S021
GND 3
IN4 4
IN3 5
SCLK
CS
DIN
DOUT
/ADC_CS CS for microprocessor
+3.3S Power supply +3.3V
DGND Ground of external
Selector1 Connected to selector 1
Power supply protection 1
Q Q
3 6 7 1 3
Front panel key
Front panel key
SPIMI Master output/slave input
SPIMO Master input/slave output
SPISCK SPI clock
+2.2k +4.7k
0.52 – 0.67 1.27 – 1.42
40 – 52 98 – 110
︿ (UP)
〉 (RIGHT)
+10.0k
1.57 – 1.72
121 – 133
BACK
u163
.
2 9 9 4 2 8
10 SCLK
DOUT
9
8 DIN
7 IN1
6 IN2
Detail of Function
1 5 0 5 8 2 9 9 4
+8.2k +27.0k
1.92 – 2.07 2.60 – 2.76
148 – 160 201 – 213
﹀ (DOWN) ENTER
m
co
9 9
2 8 9 9