GL6965 datasheet(4/23 Pages) HYNIX

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GL6965

Pin Descriptions

Pin No.

Symbol

Function

Explanation

Line Current flow-in and

Line Voltage terminal

Connected to positive output of diode bridge circuit. DC

potential of this terminal determines line voltage and if AC

signal is not input, the highest DC potential appears.

Transmit output signal and output signal of opposite transfer

side are intermingled and output at this terminal in actual use.

TOI

Current flow-in terminal

of transmit output

Connected to VL terminal (

pin) through 43

Ω . Since

almost all the line currents flow in from this terminal, set

allowable power of resistance 43

Ω to be connected to VL

terminal from this terminal considering the maximum line

cur-rent expected to be used.

TOO

Current output terminal

of transmit output

Connected to GND terminal (

pin) through 15

Ω . Since

almost all the line currents flow out from this terminal, set

allowable power of resistance 15

Ω to be connected to GND

terminal from this terminal considering the maximum line

cur-rent expected to be used.

Transmit signal is sent from this terminal. Signal of this ter-

minal varies current which is input from line through con-

nected resistance 15

Ω , and makes it be output at VL

terminal (

pin)

Bias

AC signal reference

Voltage terminal

When AC signal is input to this terminal through capacitor

(for blocking DC), signal is sent to line, Input from this ter-

minal is output to line without any relation to gain control

(PAD) or MUTE since this input does not pass through gain

control circuit or MUTE function

MFI

Input terminal of DTMF

or external input signal

Signal which is input to this terminal is output at VL terminal

(

pin) only when MUTE terminal (

pin) is in “L” state.

Since this terminal is biased to almost the same potential as

REF terminal (

pin), avoid direct impressing external

DC potential by using capacitor at inputting external terminal.

TPO

Output terminal of

transmit input Amp.

Makes negative feedback to TPI1 terminal (

pin)

TPI1

Inversion input terminal

of transmit input Amp.

Receives negative feedback from TPO terminal (

pin)

TPI2

Non-inversion

input

terminal of transmit input

Amp.

Applies DC bias to this terminal from REF terminal (

pin)

through resistance

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