HEI GL6965 Datasheet

Telephone Speech Network with Dialer Interface

1

2 3

4

5

6 7

8

9

11

16

19

V

TO1

TO0

MFI

TPO

TPI 1

TPI 2

MUTE

GND

RO 1

RO 2

BT 1

RPO

RPI 1

RPI 2

REF

PADC

UP

Description

The GL6965 is a bipolar integrated circuit for use in electronic telephones.

The GL6965 has low operating voltage, it provides 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.

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.

GL6965

Pin Configurations

AC BIAS

10

• Gain is automatically controlled according to the line current (Auto-PAD function).

• The line voltage can be increased by the external terminal (Up function).

• PKG is 20 pin DIP.

V

20

CC

18 17

15 14 13 12

1

C

25Ta°=

70

~30

−

150

~55

−

C

°

C

°

C

25Ta°=

1

9

10

2

3

17

16

15

14

13

12

20

11

4

5

6 7 8

18

19

+ +

+

GL6965

Absolute Maximum Ratings (

Parameter Symbol Value Unit

Line Voltage Line Current Power Dissipation Operating Temperature Storage Temperature

Block Diagram

+

RECEIVING

INPUT

AMP

VCC

10K

9.3K

Vref

REF

5.5K

SW/BUFFERRECEIVING

17.7K

RECEIVING

CONTROLLER

RPI1

RPI2

VL

TOl

TOO

BTI

RPO

LINE DRIVER

INTERNAL REFERENCE

CIRCUIT

GAIN

Iup

+

AC Bias

+

17.7K

UP

VCC

)

V

L

I

L

P

D

T

opr

T

stg

AMP

4K

TRANSMIT

GAIN

CONTROLLER

AC Bias

Vref

PADC

15

150

1300

TRANSMIT SW/BUFFER

+

VCC

MUTE

27.4K

Vref

VCC

RECEIVING DRIVE AMP

mA

mW

TRANSMIT

INPUT

AMP

GND

V

MFI

TPO

TPI1

TPI2

RO2

RO1

Electrical Characteristics (

Parameter Symbol

)

Test Cir-

Test Condition Min. Typ. Max. Unit

cuit

IL=20mA 2.9 3.2 3.6 V

Line Voltage

Internal Power Supply Voltage

V 1

L

V 1

CC

IL=120mA 9 11 14 V IL=20mA 1.75 1.90 2.20 V IL=120mA 5.8 6.1 6.6 V

2

KHz1f

−

=

KHz1f

−

=

KHz1f

−

=

KHz1f

−

=

Test Cir-

Test Conditon Min,. Typ. Max. Unit

cuit

Parameter

Line Voltage Rise up

Sym

-bol

V∆ 2 IL=20mA 1.1 1.5

L

Amount Transmit Gain

Receiving Gain

MF Gain

Beep Gain

Transmit Dynamic Range

Receiving Dynamic Range

G 4

T

G 5

R

G 6

MF

G 8

BP

D 4

RT

D 5

RR

IL=20mA 43 46 48 dB IL=120mA IL=20mA 40 43.5 46 dB IL=120mA IL=20mA 24 26.8 28 dB IL=120mA IL=20mA 21 24 27 dB IL=120mA IL=20mA

IL=120mA IL=20mA 3.0 — —

IL=120mA

=

dBV55V

in

=

dBV55V

in

=

dBV30V

in

=

dBV30V

in

Distortion

Ratio 4%

Distortion

Ratio 10% MFI Input Resistance ZI(MF) — 21 30 BTI Input Resistance ZI(BP) — 7 10 AC BIAS Input Resistance MUTE Terminal High Level

ZI(AB) —

)MU(V

IH

—

21 30

IL=20mA-120mA Input Voltage MUTE Terminal Low Level

)MU(V

IL

—

IL=20mA-120mA 0 — 0.2 V Input Voltage

GL6965

2.1

40 43.2 45 dB

34.5 38 40.5 dB

21.5 24 25.5 dB

21.5 24.5 27.5 dB

2.0 — —

4.0 — —

6.0 — —

V -

CC

0.5

—

V

— Ωk — Ωk

— Ωk

CC

V V V

V

p.p p.p p.p

p.p

V

Reference data

Test Cir-

Test Condition Typ Unit

cuit

IL=20mA 0.66 V Internal Reference Voltage

3

IL=120mA 2.8 V

RO

R

11

IL=20mA 14.5 dB Total Receiving Gain IL=120mA

(Balancing Network

circuit included.) 9 IL=20mA VIL=0.2V -50 µA 10 IL=20mA at GND connection -35 µA

9.0 dB

Parameter Symbol

V

REF

RO1, RO2 Output Impedance

Z — IL=30mA f=1KHz 200 

G

(Total) MUTE Terminal Input Current )MU(I UP Terminal Input Current )MP(I

IL IL

AC Impedance |Z|TEL — IL=50mA f=1KHZ 580  Phase θ — IL=50mA f=1KHZ 3 DEG

3

Pin Descriptions

1

913

7

6

Pin No. Symbol Function Explanation

1 VL Line Current flow-in and

2 TOI Current flow-in terminal

3 TOO Current output terminal

4 AC

5 MFI Input terminal of DTMF

6 TPO Output terminal of

7 TPI1 Inversion input terminal

8 TPI2 Non-inversion input

Bias

Line Voltage terminal

of transmit output

AC signal reference Voltage terminal

or external input signal

transmit input Amp.

of transmit input Amp.

terminal of transmit input Amp.

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. 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. 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 terminal varies current which is input from line through connected resistance 15 Ω , and makes it be output at VL terminal ( pin) When AC signal is input to this terminal through capacitor (for blocking DC), signal is sent to line, Input from this terminal 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 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. Makes negative feedback to TPI1 terminal ( pin)

Receives negative feedback from TPO terminal ( pin)

Applies DC bias to this terminal from REF terminal ( pin) through resistance

GL6965

10

13

4

11119 18 10

15 19 18 19 18 93

Pin No. Symbol 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

V terminal ( pin) through resistance, operation cur-

CC

20

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

Apply DC bias to this terminal from REF terminal

13

( pin) through resistance.

of receiving Input Amp.

15 RPI1 Inversion Input terminal

Receives negative feedback from RPO terminal ( pin).

of receiving input Amp.

16 RPO Output terminal of

Makes negative feedback to RPI1 terminal ( pin).

Receiving input Amp.

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

19 RO1 Receiving output terminal

20

Inversion output

Non-inversion output

V Internal power supply

CC

Output terminal to receiver. Signal of which phase is

negative to RO1 terminal ( pin), is output.

Output terminal to receiver, Signal of which phase is

negative to RO2 terminal ( pin), is output

Power supply of internal amplifiers

voltage terminal

GL6965

10

16

5

Test Circuit

20

18

15 14 13 12 11

1

3

7 8 9 10

2.2K

+ + + + +

+

–

~

C8

C6

R4

R6

1µF 100

µF µ

2.2KΩ 22KΩ 15Ω 1µ

~

+

–

GL6965

R1 R2 Beep

R2 260

µF

+

19

V

L

L1

L2

2

R1

43

GND

Telephone line Simulation Equivalent circuit

T1

Trunk

2T

2µF

Fì2

Power

C5 330pF

17 16

4 5

DTMF

Line 1

Line 2

R9 22K

R

6

C2

330pF

22K

R5

F

T(+)

R8

2.2K

F

µF

R7

6

Test Circuit (continued)

V

LLV

CC

V

CC

R

LLV

CC

V

CC

R

LLVVV R

R

I

UP

1. LV , CCV

2. LV , CCV (UP)

3.

REF

GL6965

A

V

A

V

A

V

GND

T(+)

V

GND

T(+)

SW

55nF

R

55nF

R

55nF

R

7