pbl38571 ETC-unknow, pbl38571 Datasheet - Page 4

• Manufacturer Part Number: pbl38571
• Description: High Current Speech Line Interface Circuit
• Manufacturer: ETC-unknow

PBL 385 71
Figure 5. Pin configurations.
Pin Descriptions
Refer to figure 5.
Pin
1
2
3
4,12
5,13
6
7
8
9
10
11
14
15
16
4
}
Name
+L
TO
TI
+C
Mute
GR
MO
MI 1
MI 2
RI
RE 1
RE 2
- L
}
}
Mute
+C
GR
TO
sets the DC-resistance of the circuit. The output has a low ac. impedance and the signal is used
Negative power terminal, connected to the line through a polarity guard diode bridge.
+L
Function
Output of the transmitter amplifier. Connected to the line through a polarity guard diode bridge.
Output of the transmitter amplifier. Connected through a resistor of 47 to 100 ohm to -L,
to drive a side tone balancing network.
Input of transmitter amplifier. Input impedance 17 kohm
Positive power supply terminal for most of the circuitry inside the PBL 385 71 (about 1 mA current
consumption). The +C pin should be connected to a decoupling capacitor of 47 F to 150 F.
Mute input. Maximum voltage (to mute) is 0.3 V, current sink requirement of external driver is 100 A.
Input for the gain regulation control circuitry.
Output of the microphone amplifier.
Inputs of the microphone amplifier. Input impedance 1.7 kohm
Input of receiver amplifier. Input impedance is 38 kohm
Receiver amplifier outputs. Output impedance approximately 3 ohms.
TI
-L
-L
1
2
3
4
5
6
7
8
16-pin BW DIP
16
15
14
13
12
11
10
9
RE 2
RE 1
MO
RI
-L
-L
M2
M1
Mute
GR
TO
+L
+C
TI
-L
-L
4
6
1
2
3
5
7
8
16-pin BW SO
20 %.
20 %.
20%.
12
16
15
14
13
10
11
9
-L
RE2
RE1
-L
RI
MI
MI
MO