34
TK-790/
(
B
)
/H
(
B
)
Audio Power Amplifier
: TDA8561Q (Control Unit IC522)
• Terminal description
Pin No.
Symbol
Description
1
–INV1
Non-inverting input 1
2
GND (S)
Signal ground
3
INV 2
Inverting input 2
4
RR
Supply voltage ripple rejection
5
VP1
Supply voltage
6
OUT 1
Output 1
7
GND1
Power ground 1
8
OUT 2
Output 2
9
NC
Not connected
10
OUT 3
Output 3
11
GND2
Power ground 2
12
OUT 4
Output 4
13
VP2
Supply voltage
14
MODE
Mode select switch input
15
INV 3
Inverting input 3
16
VDIAG
Diagnostic output
17
–INV 4
Non-inverting input 4
power stage
mute switch
VA
Cm
18k
Ω
60
k
Ω
2
k
Ω
+
_
power stage
mute switch
VA
Cm
18k
Ω
60
k
Ω
2
k
Ω
+
_
+
_
+
+
_
V
P
stand-by
switch
VA
15k
Ω
15k
Ω
PROTECTIONS
thermal
short-circuit
stand-by
reference
voltage
+
+
mute
reference
voltage
mute
switch
16
14
6
OUT1
8
OUT2
power stage
mute switch
VA
Cm
18k
Ω
60
k
Ω
2
k
Ω
+
_
power stage
mute switch
VA
Cm
18k
Ω
60
k
Ω
2
k
Ω
+
_
×
1
GND (S)
9
2
input
reference
voltage
NC
7
15
+
11
GND1
GND2
V
P1
V
P2
5
13
OUT 4
OUT 3
10
12
17
4
–INV 1
1
INV 2
3
RR
–INV 4
INV 3
MODE
V
DIAG
SEMICONDUCTOR DATA
• Shift register 2 on control unit (IC517)
Pin No.
Port
Name
Action
4
Q1
MM
MIC mute
H : Mute, L : Unmute
5
Q2
AS
Audio line SW
RX BPF
←→
DE-EMP
6
Q3
DS
DET line SW
DET
←→
RX BPF
7
Q4
AM1
Audio mute 1
14
Q5
RG1
Modem RG1
13
Q6
RG2
Modem RG2
12
Q7
MS
MOD line SW
MIC AMP
←→
RX BPF
11
Q8
AM2
Audio mute 2
• Shift register on TX-RX (IC201)
Pin No.
Port
Name
Action
4
Q1
STR
TX/RX VCO SW
5
Q2
Not used
6
Q3
Not used
7
Q4
Not used
14
Q5
8R
8R SW
13
Q6
W/N
Wide/Narrow SW H : Narrow, L : Wide
12
Q7
Not used
11
Q8
Not used
• Block diagram
