GL6965
1
GL6965
Telephone Speech Network with Dialer Interface
Description
The GL6965 is a bipolar integrated circuit for
use in electronic telephones.
The GL6965 has low operating voltage, it pro-
vides an excellent branch performance.
It has line voltage increasing circuit by the
exter-nal terminal. Transmitting and receiving
gains automatically vary according to the line
current.
Pin Configurations
Features
Externally adjustable transmitting,
receiving and Sidetone gains.
Switching between transmitting output
and DTMF output is possible.
Direct interface with light and compact
ceramic transmitter-receiver is possible.
Receiver follow impedance type can
also be used.
Gain is automatically controlled accor-
ding to the line current (Auto-PAD
function).
The line voltage can be increased by
the external terminal (Up function).
PKG is 20 pin DIP.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
L
V
TO1
TO0
AC BIAS
MFI
TPO
TPI 1
TPI 2
MUTE
GND
CC
V
RO 1
RO 2
BT 1
RPO
RPI 1
RPI 2
REF
PADC
UP
GL6965
2
Absolute Maximum Ratings (
C
25
Ta
=
)
Parameter
Symbol
Value
Unit
Line Voltage
Line Current
Power Dissipation
Operating Temperature
Storage Temperature
L
V
L
I
D
P
opr
T
stg
T
15
150
1300
70
~
30
-
150
~
55
-
V
mA
mW
C
C
Block Diagram
Electrical Characteristics (
C
25
Ta
=
)
Parameter
Symbol
Test
Cir-
cuit
Test Condition
Min.
Typ.
Max. Unit
IL=20mA
2.9
3.2
3.6
V
Line Voltage
L
V
1
IL=120mA
9
11
14
V
IL=20mA
1.75
1.90
2.20
V
Internal Power Supply
Voltage
CC
V
1
IL=120mA
5.8
6.1
6.6
V
1
INTERNAL
REFERENCE
CIRCUIT
9
10
2
3
17
16
15
14
13
12
20
11
4
5
6
7
8
18
19
LINE DRIVER
VCC
VCC
10K
5.5K
Iup
UP
AC Bias
AC Bias
AMP
Vref
TRANSMIT SW/BUFFER
27.4K
Vref
MFI
TPO
TPI1
TPI2
VCC
VCC
VL
TOl
TOO
BTI
RPO
RPI1
RPI2
REF
PADC
MUTE
GND
RO2
RO1
RECEIVING
INPUT
AMP
RECEIVING
GAIN
CONTROLLER
VCC
Vref
TRANSMIT
GAIN
CONTROLLER
TRANSMIT
INPUT
AMP
SW/BUFFER
RECEIVING
+
+
+
+
+
+
+
+
17.7K
17.7K
9.3K
4K
RECEIVING
DRIVE AMP
GL6965
3
Parameter
Sym
-bol
Test
Cir-
cuit
Test Conditon
Min,.
Typ. Max. Unit
Line Voltage Rise up
Amount
L
V
2
IL=20mA
1.1
1.5 2.1
V
IL=20mA
43
46
48
dB
Transmit Gain
T
G
4
IL=120mA
KHz
1
f
=
dBV
55
V
in
-
=
40
43.2 45
dB
IL=20mA
40
43.5 46
dB
Receiving Gain
R
G
5
IL=120mA
KHz
1
f
=
dBV
55
V
in
-
=
34.5
38 40.5 dB
IL=20mA
24
26.8 28
dB
MF Gain
MF
G
6
IL=120mA
KHz
1
f
=
dBV
30
V
in
-
=
21.5
24 25.5 dB
IL=20mA
21
24
27
dB
Beep Gain
BP
G
8
IL=120mA
KHz
1
f
=
dBV
30
V
in
-
=
21.5 24.5 27.5 dB
IL=20mA
2.0
--
--
p
.
p
V
Transmit Dynamic Range
RT
D
4
IL=120mA
Distortion
Ratio 4%
4.0
--
--
p
.
p
V
IL=20mA
3.0
--
--
p
.
p
V
Receiving Dynamic Range
RR
D
5
IL=120mA
Distortion
Ratio 10%
6.0
--
--
p
.
p
V
MFI Input Resistance
ZI(MF)
--
21
30
--
k
BTI Input Resistance
ZI(BP)
--
7
10
--
k
AC BIAS Input
Resistance
ZI(AB)
--
21
30
--
k
MUTE Terminal High
Level
Input Voltage
)
MU
(
V
IH
--
IL=20mA-120mA
CC
V
-
0.5
--
CC
V
V
MUTE Terminal Low
Level
Input Voltage
)
MU
(
V
IL
--
IL=20mA-120mA
0
--
0.2
V
Reference data
Parameter
Symbol
Test
Cir-
cuit
Test Condition
Typ Unit
IL=20mA
0.66 V
Internal Reference Voltage
REF
V
3
IL=120mA
2.8 V
RO1, RO2 Output Impedance
RO
Z
--
IL=30mA f=1KHz
200
IL=20mA
14.5 dB
Total Receiving Gain
R
G
(Total)
11
IL=120mA
(Balancing Network
circuit included.)
9.0 dB
MUTE Terminal Input Current
)
MU
(
I
IL
9
IL=20mA V
IL
=0.2V
-50 A
UP Terminal Input Current
)
MP
(
I
IL
10
IL=20mA at GND connection
-35 A
AC Impedance
|Z|TEL --
IL=50mA f=1KHZ
580
Phase
--
IL=50mA f=1KHZ
3
DEG
GL6965
4
Pin Descriptions
Pin No. Symbol
Function
Explanation
1
VL
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.
2
TOI
Current flow-in terminal
of transmit output
Connected to VL terminal ( pin) through 43
. Since
almost all the line currents flow in from this terminal, set
allowable power of resistance 43
to be connected to VL
terminal from this terminal considering the maximum line
cur-rent expected to be used.
3
TOO
Current output terminal
of transmit output
Connected to GND terminal ( pin) through 15
. Since
almost all the line currents flow out from this terminal, set
allowable power of resistance 15
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
, and makes it be output at VL
terminal ( pin)
4
AC
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
5
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.
6
TPO
Output terminal of
transmit input Amp.
Makes negative feedback to TPI1 terminal ( pin)
7
TPI1
Inversion input terminal
of transmit input Amp.
Receives negative feedback from TPO terminal ( pin)
8
TPI2
Non-inversion input
terminal of transmit input
Amp.
Applies DC bias to this terminal from REF terminal ( pin)
through resistance
1
1
1
10
9
13
7
6
13
GL6965
5
Pin No. Symbo
l
Function
Explanation
9
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
10
GND
Ground terminal
Connected to negative output of diode bridge circuit.
11
UP
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.
12
PADC
Pad control terminal
When this terminal is connected to GND terminal ( pin)
or
CC
V
terminal ( pin) through resistance, operation cur-
rent of gain control (Auto-PAD) performed by line current
can be controlled.
13
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.
14
RPI2
Non-inversion input
terminal
of receiving Input Amp.
Apply DC bias to this terminal from REF terminal
( pin) through resistance.
15
RPI1
Inversion Input terminal
of receiving input Amp.
Receives negative feedback from RPO terminal ( pin).
16
RPO
Output terminal of
Receiving input Amp.
Makes negative feedback to RPI1 terminal ( pin).
17
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
18
RO2
Receiving output terminal
Inversion output
Output terminal to receiver. Signal of which phase is
negative to RO1 terminal ( pin), is output.
19
RO1
Receiving output terminal
Non-inversion output
Output terminal to receiver, Signal of which phase is
negative to RO2 terminal ( pin), is output
20
CC
V
Internal power supply
voltage terminal
Power supply of internal amplifiers
1
1
1
19
18
10
10
20
13
16
15
19
18
19
18
9
3
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