PBL 388 12
F2out
Txout
1
2
3
4
5
6
7
8
9
18 +Txin
17 -Txin
16 CTR
15 NC
1
2
16
15
CTR
-Txin
GND
+V
TxDetin
TxDetout
N Det
14
13
3
+Txin
F2out
-Rxin
F5out
4
5
6
14 GND
13 +V
12
11
Txout
Rxout
CMP
TxDetin
RxDetin
RxDetout
CMP
RxDetout
Rx Detin
Rxout
12 -Rxin
11 +Rxin
10 F5out
7
8
10
9
TxDetout
NDet
16-pin SO
18-pin DIP
Figure 4. Pin configuration.
Pin Descriptions:
Refer to figure 4. (16-pin SO and 18-pin DIP package)
Pin Pin
SO DIP Symbol
Pin Pin
SO DIP Symbol
Description
Description
1
2
3
4
5
6
7
16 CTR
17 -Txin
18 +Txin
Control input for gain dynamics
(25 or 50dB), mute and disable.
9
6
7
CMP
Comparator input..
Summing point to the different
detector outputs.
Transmitter channel negative input.
Input impedance 3 kohm.
10
RxDetout
Output of the receiver channel signal
detector. Goes positive referred to the
internal ref. voltage of app. 2V when a
receiver signal is present
Transmitter channel positive input.
Input impedance 100 kohm.
1
2
3
4
F2out
Output of the second amplifier in the
transmitter channel.
11
12
8
9
RxDetin
Rxout
Input of the receiver channel signal
detector. Input impedance 13 kohm.
Txout
Transmitter channel output. Min. ac
load impedance 10 kohm.
Receiver channel output. Min. ac load
impedance 10 kohm.
TxDetin
TxDetout
Input of the transmitter channel signal
detector. Input impedance 13 kohm.
13 10 F5out
11 +Rxin
Output of the second amplifier in the
receiver channel.
Output of the transmitter channel signal
detector. Goes nagative referred to the
internal ref. voltage of app. 2V when a
transmitter signal is present.
Receiver channel positive input. Input
impedance 140 kohm.
14 12 -Rxin
15 13 V+
Receiver channel negative input. Input
impedance 20 kohm.
8
5
NDet
Background noise detector output.
Goes positive referred to the internal ref.
voltage of app. 2V when a backgrounud
noise signal is present
Supply of the speech switching
circuitry. A shunt regulator, voltage
apprx. 3.3V at 1.0mA.
16 14 GND
15 NC
System ground.
Not connected.
5
ERICSSON [ ERICSSON ]
