Harman Kardon AVR 520, Service Manual

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Triple 2-channel analog multiplexer /
demultiplexer
BU4053BC / BU4053BCF / BU4053BCFV
The BU4053BC, BU4053BCF, and BU4053BCFV are multiplexers / demultiplexers capable of selecting and combin-
ing analog signals and digital signals in a 2 ch
×
3 configuration. Inhibit signals and control signals are used to turn
on the switch corresponding to each of the channels. In addition, even if the logical amplitude (V
DD
-V
SS
) of the control
signal is low, signals with a large amplitude (V
DD
-V
EE
) can be switched.
Also, as each switch has a low ON resistance, it can be connected to a low impedance circuit.
•
Logic circuit diagram
•
Truth table
V
DD
(16)
INH (6)
B (10)
A (11)
C (9)
V
SS
(8)
V
EE
(7)
Z
0
(5)
Z
1
(3)
(4) Z
Y
0
(2)
Y
1
(1)
(15) Y
X
0
(12)
X
1
(13)
(14) X
LEVEL
CONVERTER
BINARY TO 1of 2
DECODER WITH INH
INH A B C ON SWITCH
L L L L
L H L L
L L H L
L H H L
L L L H
L H L H
L L H H
L H H H
H X X X NONE
X
0
Y
0
Z
0
X
1
Y
0
Z
0
X
0
Y
1
Z
0
X
1
Y
1
Z
0
X
0
Y
0
Z
1
X
1
Y
0
Z
1
X
0
Y
1
Z
1
X
1
Y
1
Z
1
X: Irrelevant
•
Block diagram
Y
1
1
Y
0
2
Z
1
3
Z 4
Z
0
5
INH
6
V
EE
7
V
SS
8
16
15
14
13
12
11
10
9
V
DD
Y
X
X
1
X
0
A
B
C
C
Z
INH
V
EE
Y
X
A
B
Y
0
Z
1
Z
0
Y
1
X
1
X
0
AVR520 harman/kardon
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