pbl388141sot ETC-unknow, pbl388141sot Datasheet - Page 5

• Manufacturer Part Number: pbl388141sot
• Description: Voice Switched 2-channel Circuit With Loudspeaker Amplifier
• Manufacturer: ETC-unknow

Figure 4. Pin configuration.
Pin Descriptions
Refer to figure 6. (24 pin DIP and 24 pin SO package)
Pin
10
1
2
3
4
5
6
7
8
9
Symbol
-Txin
+Txin
F2out
Txout
TxDetin
TxDetout Output of the transmitter channel signal
Ref.
NDet
CMP
RxDetout Output of the receiver channel signal
detector outputs.
Description
Transmitter channel negative input.
Input impedance 3.16 kohm.
Transmitter channel positive input.
Input impedance 100 kohm.
Output of the second amplifier in the
transmitter channel.
Transmitter channel output. Min. ac
load impedance 10 kohm.
Input of the transmitter channel signal
detector. Input impedance 13 kohm.
detector. Goes nagative referred to the
internal ref. voltage of appx. 2V when a
transmitter signal is present.
Internal reference app. 2V.
Background noise detector output.
Goes positive referred to the internal ref.
voltage of app. 2V when a background
noise signal is present
Comparator input. External resistance
to this point should not be less than
50 kohm. Summing point to the different
detector. Goes positive referred to the
internal ref. voltage of appx. 2V when a
receiver signal is present
RxDetout
TxDetout
RxDetin
TxDetin
N Det
Rxout
+Txin
F2out
Txout
-Txin
CMP
Ref.
10
11
12
1
2
3
4
5
6
7
8
9
24 pin DIP
18
24
23
22
21
20
19
17
16
15
14
13
LSPin
VOL
GND
-Rxin
+Rxin
F5out
CTR
V
LL
GND
LSP
V+
A
A
Pin
11
14
15
16
17
18
19
20
21
22
23
24
12
13
Symbol
RxDetin
Rxout
F5out
+Rxin
-Rxin
V+
GND
GND
LSP
LL
VOL
V
LSPin
CTR
A
RxDetout
TxDetout
RxDetin
TxDetin
A
N Det
Rxout
+Txin
F2out
Txout
-Txin
CMP
Ref.
10
11
12
1
2
3
4
5
6
7
8
9
24 pin SO
Input of the receiver channel signal
detector. Input impedance 13 kohm.
Receiver channel output. Min. ac load
impedance 10 kohm.
Output of the second amplifier in the
receiver channel.
Receiver channel positive input. Input
impedance 140 kohm.
Receiver channel negative input. Input
impedance 20 kohm.
Supply of the speech switching circuitry.
1.0mA.
System ground.
Power amplifier ground. Can lie positive
relative to GND, otherways connected
externally to GND.
Loudspeaker power amplifier output.
Feedback loop input
Volume control input. By sourcing a
current of appx. 0-40 A into this pin the
gain can be reduced.
Positive supply for the loudspeaker
amplifier.
Loudspeaker amplifier signal input. Input
impedance 30 kohm.
Control input for gain dynamics
(25 or 50dB), mute and disable.
Description
A shunt regulator, voltage apprx. 3.3V at
24
23
22
20
19
18
17
16
15
14
13
21
V
CTR
LSP in
VOL
+Rxin
F5out
LSP
GND
-Rxin
LL
GND
V+
A
A
PBL 388 14
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