PBL 385 41
+L
TO
1
2
3
4
5
6
7
8
9
18 RE 2
17 RE 1
16 DR
15 RI
20
RE 2
+L
TO
1
2
3
4
5
6
7
8
9
TI
19 RE 1
18 DR
17 RI
+C
TI
+C
Mute
GR
14 -L
Mute
GR
16 -L
13 MI 2
12 MI 1
11 MO
10 DI
15 MI 2
14 MI 1
13 MO
12 DI
DCS
DCO
DCO
1
2
1
DCS
DCO
DCO
1
2
1
NC 10
11 NC
20-pin SO
18-pin DIP
Figure 5. Pin configuration.
Pin Descriptions
Refer to figure 5.
DIP SO
Name
Function
1
2
1
2
+L
Output of the DC-regulator and transmitter amplifier, connected to the line through a polarity
guard diode bridge.
TO
Output of the transmitter amplifier, connected through a resistor of 47 to 100 ohm to -L,
sets the DC-resistance of the circuit. The output has a low AC output impedance and the
signal is used to drive a side tone balancing network.
3
4
3
4
TI
Input of the transmitter amplifier. Input impedance 17 kohm ± 20 %.
+C
Positive power supply terminal for most of the circuitry inside the PBL 385 41 (about 1 mA current
consumption). The +C pin must be connected to a decoupling capacitor of 47 µF to 150 µF.
5
5
Mute
When low, speech circuit is muted and the DTMF input is enabled. Maximum voltage (at mute) is
0.3 V, current sink requirement of external driver is 50 µA.
6
6
GR
Control input for the gain regulation function.
7
7
DCS 1
DCO 2
DCO 1
DI
Control input to the DC1-supply. A resistor to -line sets the maximum current load of the supply.
Output of the DC2-supply.
8
8
9
9
Output of the DC1-supply.
10
11
12
13
14
15
16
17
18
12
13
14
15
16
17
18
19
20
10
11
Input for the DTMF-signal. Input impedance 25 kohm ± 20 %.
Output of the microphone amplifier or DTMF-amplifier.
MO
MI 1
Inputs to the microphone amplifier. Input impedance 1.7 kohm ± 20 %.
}
MI 2
-L
The negative power terminal, connected to the line through a polarity guard diode bridge.
Input of receiver amplifier. Input impedance 38 kohm ± 20 %.
RI
DR
Control input for the receiver amplifier driving capability.
RE 1
RE 2
Receiver amplifier outputs. Output impedance is approximately 3 ohm.
}
Not connected
Not connected
4
ERICSSON [ ERICSSON ]
