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MITSUBISHI SOUND PROCESSOR ICs
M65845AFP
DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT
Input impedance to 35 pin is so high (1MΩ) that ALC base voltage can be determined
by division resistance.
Vcc
R17(51k)
35
R16
C33(0.01µ )
at Vcc=5V
ALC operation voltage (dBV)
35 pin control voltage VALC (V)
resistance R16 (Ω)
+3
0
-2
-4
-6
-8
-10
0.50
1.09
1.38
1.61
1.79
1.94
2.05
5.6k
15k
20k
24k
27k
33k
36k
(4) MIC SW
Input low level to 31 pin (MIC SW) ,then microphone and echo signal can be cut.
31 pin (MIC SW)
H or OPEN
L
MIC SW
ON
OFF
ECHO SIGNAL
OUTPUT
ON
MUTE
MITSUBISHI
ELECTRIC
( 9 / 15 )