GL6965

14

3. Gain control circuit (PADC)

1) PADC terminal open state. Transmiting and receiving gains vary automatically according to the

line current amount (Auto-PAD). With the increase of line current amount; the gain attenuates by

about - 3dB at transmiting and about - 5.5dB at receiving.

2) In case PADC terminal is connected to GND by resistance. The gain begins to attenuate with the

line current amount less than that when PADC terminal is open. Set the value of resistance to be

connected at 25k§ Ù

or over.

3) In case PADC terminal is connected to VCC by resistance. The gain begins to attenuate with the

line current amount more than that when PADC terminal is open.

Set the value of resistance to be connected at 10k§ Ùor over.

4. MUTE circuit (MUTE)

The internal equivalent circuit in the MUTE terminal is a shown in the figure below. Since the

or below GND.

This is most suitable for input from the output of open drain or open collector type.

*

Internal equivalent circuit.

20 k§ Ù

5 k§ Ù

PIN12 (PADC)

+

-

PIN9 (MUTE)

Dialing Mode (High)