Audio ICs
!Input / output circuits
Pin No. Pin name Pin voltage
41
INLA
42
INRA
43
INLB
44
INRB
45
INLC
46
INRC
VCC/2
54
GND
−
53
VFC1
VCC/2
Equivalent circuit
VCC
50k
GND
VCC
GND
−
17.5k
35k
35k
VCC
55
VFC2
VCC/2
GND
17.5k 35k
35k
47
INLD
48
INRD
VCC/2
51
RECL
52
RECR
VCC/2
VCC
GND
12.9k
7.1k
VCC
GND
BH3874AKS2
Pin description
A pin for inputting a sound signal.
It is suitable for input of CD, MD,
tuner and tape.
The input impedance is 50kΩ
(upon typical setting).
A ground pin
A pin for setting vocal fade
frequency characteristic.
A pin for setting vocal fade
frequency characteristic.
A pin for inputting a sound signal.
The input impedance is 20kΩ
(upon typical setting).
It is possible to set 0dB or −9dB.
A pin for outputting a sound
signal for recording.