GL6965
Pin No.
9
Symbo
l
MUTE
Function
MUTE terminal
Explanation
Switching terminal of transmit signal with MFI input signal
in transmitting system.
Switching terminal of receiving signal with BTI input signal
in receiving system.
“L” State—
Signal which is input from MFI is output to
VL terminal ( 1 pin)
Signal which is input from BTI is output to
terminals RO1 and RO2.
“H” or “ OPEN” state
Transmitting input signal is output to VL terminal
( 1 pin). Receiving input signal is
18 pin)
output to terminals RO1 and RO2 19 pin,
(
This terminal is pulled up by constant-current circuit
Connected to negative output of diode bridge circuit.
When this terminal is connected to GND terminal 10 pin)
(
directly or through resistance. DC potential of VL terminal
( 1 pin) can be in-creased up to max. 1.5V (TYP.) in the
same line current.
This function has no relation to the state of MUTE terminal.
When this terminal is connected to GND terminal 10 pin)
(
or
V
CC
terminal ( 20 pin) through resistance, operation cur-
rent of gain control (Auto-PAD) performed by line current
can be controlled.
Voltage of this terminal is used as a reference voltage of in-
ternal amplifiers.
Never used this terminal for an external power supply.
Apply DC bias to this terminal from REF terminal
( 13 pin) through resistance.
16
Receives negative feedback from RPO terminal ( pin).
Makes negative feedback to RPI1 terminal 15 pin).
(
Signal which is input to this terminal is output to terminals
RO1 and RO2 ( 19 pin and 18 pin) only when MUTE ter-
minal ( 9 pin) is in “L” state. Since this terminal is biased
to about the same potentialas REF terminal ( 3 pin), avoid
direct impressing external DC voltage through capacitor at
in-putting external signal
Output terminal to receiver. Signal of which phase is
negative to RO1 terminal (19 pin), is output.
Output terminal to receiver, Signal of which phase is
negative to RO2 terminal ( 18 pin), is output
Power supply of internal amplifiers
10
11
GND
UP
Ground terminal
DC impedance control
terminal
12
PADC
Pad control terminal
13
REF
Internal reference voltage
Output terminal
Non-inversion input
terminal
of receiving Input Amp.
Inversion Input terminal
of receiving input Amp.
Output terminal of
Receiving input Amp.
Dial confirmation sound
(Beep Tone, DTMF),
monitor
sound input terminal
14
RPI2
15
16
17
RPI1
RPO
BTI
18
19
20
RO2
RO1
V
CC
Receiving output terminal
Inversion output
Receiving output terminal
Non-inversion output
Internal power supply
voltage terminal
5
HYNIX [ HYNIX SEMICONDUCTOR ]
