pbl388121so ETC-unknow, pbl388121so Datasheet - Page 5

• Manufacturer Part Number: pbl388121so
• Description: Voice-switch Circuit Handsfree Speakerphone
• Manufacturer: ETC-unknow

Figure 4. Pin configuration.
Pin Descriptions:
Refer to figure 4. (16-pin SO and 18-pin DIP package)
SO
Pin
1
2
3
4
5
6
7
8
DIP Symbol
16
17
18
Pin
1
2
3
4
5
CTR
-Txin
+Txin
F2out
Txout
TxDetin
TxDetout
NDet
TxDetout
TxDetin
F2out
Txout
NDet
+Txin
-Txin
CTR
3
4
5
6
7
8
1
2
Description
16-pin SO
Control input for gain dynamics
(25 or 50dB), mute and disable.
Transmitter channel negative input.
Input impedance 3 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.
Output of the transmitter channel signal
detector. Goes nagative referred to the
internal ref. voltage of app. 2V when a
transmitter signal is present.
Background noise detector output.
Goes positive referred to the internal ref.
voltage of app. 2V when a backgrounud
noise signal is present
16
15
14
13
12
10
11
9
GND
+V
F5out
Rxout
RxDetin
RxDetout
CMP
-Rxin
Pin
SO
14
15
9
10
11
12
13
16
Pin
DIP Symbol
10
11
12
13
14
15
6
7
8
9
RxDetout
TxDetout
Rx Detin
CMP
RxDetout
RxDetin
Rxout
F5out
+Rxin
-Rxin
V+
GND
NC
TxDetin
Rxout
F2out
N Det
Txout
CMP
1
2
3
4
5
6
7
8
9
Description
Comparator input..
Summing point to the different
detector outputs.
Output of the receiver channel signal
detector. Goes positive referred to the
internal ref. voltage of app. 2V when a
receiver signal is present
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. A shunt regulator, voltage
apprx. 3.3V at 1.0mA.
System ground.
Not connected.
18-pin DIP
18
17
16
15
14
13
12
11
10
+Txin
-Txin
CTR
NC
GND
+V
-Rxin
+Rxin
F5out
PBL 388 12
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