4

PBL 385 82

Pin Descriptions

Refer to figure 5.

DIP

SO 20 SO 16

Name

Function

1

1

1

+L

Output of the transmitter amplifier. Connected to the line through a

polarity guard diode bridge.

2

2

2

TO

Output of the transmitter amplifier. Connected through a resistor of 47 to 100 ohm to -L.

Sets the DC-charateristic of the circuit.The output has a low AC output impedance and

the signal is used to drive a side tone balancing network.

3

3

3

TI

Input of transmit amplifier. Input impedance 17 k

Ω ± 20 %.

4

4

4

+C

The positive power supply terminal for most of the circuitry inside the PBL 385 82

(about 1 mA current consumption). The +C-pin is to be connected to a decoupling

capacitor of 47

µF to 150 µF.

6

6

6

GR

The control input for the gain regulation in the receiver.

55

5

14

16

12

-L

The negative power terminal, connected to the line through a polarity guard diode

16

18

14

bridge.

15

17

13

RI

Input of the receive signal amplifier. Input impedance is 38 kohm

± 20 %.

17

19

15

RE2

The receive signal amplifier outputs. Output impedance is approximately 3 ohm.

18

20

16

RE1

77

7

NA

88

8

NA

99

9

NA

10

10

10

NA

11

11

11

NA

12

12

NA

13

13

NA

14

NA

15

NA

20-pin SO

16-pin SO

18-pin DIP

Figure 5. Pin configuration.

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}

+L

TO

TI

+C

GR

RI

-L

1

2

3

4

5

6

7

8

16

15

14

13

12

11

9

10

RE 2

RE 1

18

17

-L

NA

NA

NA

NA

NA

NA

NA

-L

1

2

3

4

5

6

7

8

20

19

18

17

16

15

14

13

TO

+L

GR

-L

RE1

NA

NA

TI

+C

RI

-L

NA

NA

NA

9

12

10

11

NA

NA

NA

NA

-L

RE2

1

2

3

4

5

6

7

8

16

14

13

TO

+L

GR

-L

NA

NA

TI

+C

RI

-L

NA

NA

NA

9

12

10

11

-L

RE2

15

RE1