GL6965 datasheet(5/23 Pages) HYNIX

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GL6965

Pin No.

Symbo

Function

Explanation

MUTE

MUTE terminal

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 (

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

(

pin). Receiving input signal is

output to terminals RO1 and RO2 (

pin,

pin)

This terminal is pulled up by constant-current circuit

GND

Ground terminal

Connected to negative output of diode bridge circuit.

DC impedance control

terminal

When this terminal is connected to GND terminal (

pin)

directly or through resistance. DC potential of VL terminal

(

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.

PADC

Pad control terminal

When this terminal is connected to GND terminal (

pin)

terminal (

pin) through resistance, operation cur-

rent of gain control (Auto-PAD) performed by line current

can be controlled.

REF

Internal reference voltage

Output terminal

Voltage of this terminal is used as a reference voltage of in-

ternal amplifiers.

Never used this terminal for an external power supply.

RPI2

Non-inversion input

terminal

of receiving Input Amp.

Apply DC bias to this terminal from REF terminal

(

pin) through resistance.

RPI1

Inversion Input terminal

of receiving input Amp.

Receives negative feedback from RPO terminal (

pin).

RPO

Output terminal of

Receiving input Amp.

Makes negative feedback to RPI1 terminal (

pin).

BTI

Dial confirmation sound

(Beep Tone, DTMF),

monitor

sound input terminal

Signal which is input to this terminal is output to terminals

RO1 and RO2 (

pin and

pin) only when MUTE ter-

minal (

pin) is in

“L” state. Since this terminal is biased

to about the same potentialas REF terminal (

pin), avoid

direct impressing external DC voltage through capacitor at

in-putting external signal

RO2

Receiving output terminal

Inversion output

Output terminal to receiver. Signal of which phase is

negative to RO1 terminal (

pin), is output.

RO1

Receiving output terminal

Non-inversion output

Output terminal to receiver, Signal of which phase is

negative to RO2 terminal (

pin), is output

Internal power supply

voltage terminal

Power supply of internal amplifiers

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