pbl38573 ETC-unknow, pbl38573 Datasheet - Page 4

• Manufacturer Part Number: pbl38573
• Description: Speech Circuit Constant Current Feeding Systems
• Manufacturer: ETC-unknow

Pin Descriptions:
Refer to figure 5.
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
PBL 385 73
Figure 5. Pin configurations.
4
Name
+L
TO
TI
+C
Mute
GR
DCO
MO
MI 1
MI 2
-L
RI
RE 1
RE 2
}
}
DCO
Mute
GR
TO
+C
+L
TI
Function
Output of the DC-regulator and transmit amplifier. This pin is connected to the line through a polarity
guard diode bridge.
Output of the transmit amplifier. This pin is 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.
Input of transmit amplifier. Input impedance 17 kohm
Positive power supply terminal for most of the circuitry inside the PBL 385 73 ( current consumption
about 1 mA). The +C pin shall be connected to a decoupling capacitor of 47 F to 150 F.
Maximum voltage (to mute) is 0.3 V, current sink requirement of external driver is 100 A.
Input of the gain regulation with line length.
Output of the auxiliary DC-supply.
Output of the microphone amplifier or DTMF-amplifier.
Microphone amplifier Inputs. 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
Receiver amplifier outputs. Output impedance is approximately 3 ohm.
1
2
3
4
5
6
7
14-pin DIP
14
13
12
11
10
9
8
-L
MI 1
MO
RE 2
RE 1
RI
MI 2
Mute
DCO
GR
TO
+C
+L
TI
20 %.
20 %.
1
2
3
4
4
5
5
6
7
20 %.
14-pin SO
14
13
12
17
11
16
10
9
8
RE 2
RE 1
RI
-L
MI 2
MI 1
MO