Yamaha PORTATONE KB-280 Service Manual - Page 16

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Yamaha PORTATONE KB-280 Service Manual
KB-280
AK4385ET (X6040A00) DAC (Digital to Analog Converter)
PIN
NAME
I/O
NO.
1
MCLK
I
Master Clock
2
BICK
I
Audio Serial Data Clock
3
SDTI
I
Audio Serial Date Input
4
LRCK
I
L/R Clock
5
PDN
I
Power Down mode
6
CSN
I
Chip Select
7
CCLK
I
Control Data Input
8
CDTI
I
Control Data Input

IC BLOCK DIAGRAM

SN74LV32APWR (X5647A00)
DMLCD: IC207
Quad 2 Input OR
1A
1
1B
2
1Y
3
2A
4
2B
5
2Y
6
GND
7
16
FUNCTION
SN74LV138APWR (X7284A00)
DMLCD: IC401, 402
3 to 8 Demultiplexer
Vcc
14
4B
13
Select
4A
12
4Y
11
G2A
Enable
3B
10
G2B
3A
9
G1
Output
3Y
Y7
8
GND
PIN
NAME
I/O
NO.
9
AOUTR-
O
10
AOUTR+
O
11
AOUTL-
O
12
AOUTL+
O
13
Vss
-
14
VDD
-
15
DZFR
O
16
DZFL
O
1
A
16
Vcc
A
2
B
Y0
15
B
YO
3
C
14
C
Y1
Y1
4
13
G2A
Y2
Y2
Output
5
G2B
Y3
12
Y3
6
G1
11
Y4
Y4
7
Y7
Y5
10
Y5
Y6
8
9
Y6
FUNCTION
Rch Analog out(-)
Rch Analog out(+)
Lch Analog out(-)
Lch Analog out(+)
Ground
Power Supply
Rch Data Zero Input Detect
Lch Data Zero Input Detect
BA4510F-E2 (X7300A00)
DMLCD: IC502
Dual Operational Amplifier
Output 1
1
+V
-Input 1
2
-
+
+Input 1
3
+
-
VEE
4
-V
DMLCD: IC501
VCC
8
Output 2
7
-Input 2
6
+Input 2
5