MX-K50
1-42
LOGIC
SW2
SW1
L+R
L-R
L
R
+
+
+
+
+
-
-
-
-
-
+
+
+
-
-
C
16
B
15
A
14
ROUT
13
LP
12
LP
11
LP
10
RIN
9
1
VCC
2
MIC
3
LOUT
4
FK
5
TK
6
LIN
7
BIAS
8
GND
BA3837 (IC301
(on the voice board)
) : MIC mixer
1.Block diagram
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
VCC
MIC IN
LOUT
FK
TK
LIN
BIAS
GND
RIN
LPF1
LPF2
LPF3
ROUT
CONTA
CONTB
CONTC
Power supply
Microphone mixing input
Channel L output
Non connect
Non connect
Channel L input
Signal bias
Connect to GND
Channel R input
Connects to LPF time constant element
Connects to LPF time constant element
LPF outpout
Channel R output
Mode select input A
Mode select input B
Mode select input C
-
I
O
-
-
I
I
-
I
O
O
O
O
I
I
I
Pin No.
Symbol
I/O
Function
2.Pin function
