PBL38541 Ericsson, PBL38541 Datasheet - Page 4

• Manufacturer Part Number: PBL38541
• Description: Universal Speech Circuit
• Manufacturer: Ericsson

PBL 385 41
Pin Descriptions
Refer to figure 5.
DIP
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
4
Figure 5. Pin configuration.
SO
1
2
3
4
5
6
7
8
9
12
13
14
15
16
17
18
19
20
10
11
Name
+L
TO
TI
+C
Mute
GR
DCS 1
DCO 2
DCO 1
DI
MO
MI 1
MI 2
-L
RI
DR
RE 1
RE 2
}
}
Function
Output of the DC-regulator and transmitter amplifier, connected to the line through a polarity
Output of the transmitter amplifier, connected through a resistor of 47 to 100 ohm to -L,
signal is used to drive a side tone balancing network.
Input of the transmitter amplifier. Input impedance 17 kohm
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 F to 150 F.
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 A.
Control input for the gain regulation function.
Control input to the DC1-supply. A resistor to -line sets the maximum current load of the supply.
Output of the microphone amplifier or DTMF-amplifier.
Inputs to the microphone amplifier. Input impedance 1.7 kohm
The negative power terminal, connected to the line through a polarity guard diode bridge.
Input of receiver amplifier. Input impedance 38 kohm
Control input for the receiver amplifier driving capability.
Receiver amplifier outputs. Output impedance is approximately 3 ohm.
Not connected
Not connected
guard diode bridge.
sets the DC-resistance of the circuit. The output has a low AC output impedance and the
Output of the DC2-supply.
Output of the DC1-supply.
Input for the DTMF-signal. Input impedance 25 kohm
DCO
DCO
DCS
Mute
GR
TO
+C
+L
TI
1
2
1
1
2
3
4
5
6
7
8
9
18-pin DIP
18
17
16
15
14
13
12
11
10
RE 2
RE 1
DR
RI
-L
MI 2
MI 1
MO
DI
DCO
DCO
DCS
Mute
GR
NC
TO
+C
+L
TI
1
2
1
10
1
2
3
4
4
5
5
6
7
8
9
20-pin SO
20 %.
20 %.
20 %.
20
19
18
17
17
16
16
15
14
13
12
11
20 %.
DI
NC
RE 2
RE 1
DR
RI
-L
MI 2
MI 1
MO