GL6962/GL6962A
GL6962/GL6962A
Low Voltage Universal Speech Network
Description
The GL6962 and GL6962A are bipolar integrated
circuits that perform all speech and line interface
functions required in fully electronic telephone sets.
They perform electronic switching between dialing
and speech. The ICs operate at line voltage down
to 1.6V DC (with reduced performance) to
facilitate the use of more telephone sets connected
in parallel.
PIN Configuration
(TOP View)
LN
TGA1
1
2
3
4
16
15
14
13
SLPE
AGC
REG
V
CC
MUTE
DTMF
IR
V
EE
Features
Low DC line voltage: operates down to 1.6V
(excluding polarity guard)
Voltage regulator with adjustable static
resistance
Provides a supply for external circuits
Symmetrical high-impedance inputs (64k¥
Ø
for
)
dynamic, magnetic or piezo-electric microphones
Asymmetrical high-impedance inputs(32k¥
Ø
)
for electric microphones
DTMF signal input with confidence tone
MUTE input for pulse or DTMF dialing
(GL6962)
MUTE
input for pulse or DTMF dialing
(GL6962A)
Receiving amplifier for dynamic, magnetic or
piezo-electric earpieces.
Large gain setting ranges on microphone and
earpiece amplifiers.
Line loss compensation (line current dependent)
for microphone and earpiece amplifiers
Gain control curve adaptable to exchange supply
DC line voltage adjustment facility
Packaged in 16 DIP/SOP.
TGA2
QR
RGA
MIC-
MIC+
I
ref
GL6962
5
6
7
8
12
11
10
9
* Pin 12 is active LOW(MUTE) for GL6962A
1
GL6962/GL6962A
Block Diagram
V
CC
LN
13
RGC
1
5
RGA
IR
10
-
4
QR
+
TGC
MIC
7
MIC-
6
dB
+
_
+
_
RM
2
TGA1
-
+
DTMF
11
3
TGA2
(1)
MUTE
12
SUPPLY
&
REFERENCE
MUTE
CONTROL
RM
RGC TGC
CURRENT
REFERENCE
LOW
VOLTAGE
CIRCUIT
CURRENT
CONTROL
Ó
9
V
EE
8
I
ref
15
AGC
14
REG
16
SLPE
*
Pin 12 is active LOW (
MUTE
) for GL6962A.
2
GL6962/GL6962A
Pin Description
PIN NUMBER
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
SYMBOL
LN
TGA1
TGA2
QR
RGA
MIC-
MIC+
I
ref
V
EE
IR
DTMF
MUTE
V
CC
REG
AGC
SLPE
DESCRIPTION
Positive line terminal
Gain adjustment: transmitting amplifier
Gain adjustment: transmitting amplifier
Non-inverting output: receiving amplifier
Gain adjustment: receiving amplifier
Inverting microphone input
Non-Inverting microphone input
Current stabilizer
Negative line terminal
Receiving amplifier input
Dual-tone multi-frequency input
Mute input
(1)
Positive decoupling
Voltage regulator decoupling
Automatic gain control input
Slope (DC resistance) adjustment.
(1) Pin 12 is active LOW (
MUTE
) for GL6962A.
3
GL6962/GL6962A
Absolute Maximum Ratings
SYMBOL
V
LN
I
line
PARAMETER
Positive continuous line voltage
Line Current
R9 = 20 ; Note1
GL6962 ; GL6962A
Input voltage on all other pins
Positive input voltage
Negative input voltage
Total power dissipation
R9 = 20 ; Note2
GL6962 ; GL6962A
Operating ambient temperature
Storage temperature
MIN
-
MAX
12
UNIT
V
-
-
-
140
V
CC
+0.7
-0.7
mA
V
V
V
i
P
tot
T
amb
T
stg
-
-25
-40
666
+75
+125
mW
¡ É
¡ É
Maximum Ratings are those values beyond which damage to the device may occur.
Functional Operation should be restricted to the limits in the Electrical Characteristics tables or
pin Descriptions section
Notes to the Absolute Maximum Ratings
1.
2.
Mostly dependent on the maximum required T
amb
and on the voltage between LN and SLPE.
Calculated for the maximum ambient temperature specified T
amb
= 75¡
É
and maximum
junction temperature of 125¡
É
.
4
GL6962/GL6962A
Electrical Characteristics
I
line
= 11 to 140 mA, V
EE
= 0V, f = 800Hz; T
amb
= 25¡
É
; unless otherwise specified
SYMBOL
PARAMETER
Supplies LN and VCC (Pin 1 and 13)
V
LN
Voltage drop over circuit
Between LN and V
EE
CONDITION
MIC inputs open circuit
I
line
= 1mA
I
line
= 4mA
I
line
= 15mA
I
line
= 100mA
I
line
= 140mA
I
line
= 15mA
R
VA
(LN to REG)=68
k§
Ù
R
VA
(REG to SLPE)=39
k§
Ù
V
CC
= 2.8V
I
line
= 15mA
MIN
TYP
MAX
UNIT
-
-
3.55
4.9
-
-
-
-
1.6
1.9
4.0
5.7
-
3.5
4.5
0.9
-
-
4.25
6.5
7.5
-
-
1.35
V
V
V
V
V
V
V
mA
V
LN
I
CC
V
CC
MUTE = HIGH
IP = 1.2mA
IP = 0mA
GL6962A
MUTE
= LOW
IP = 1.2mA
IP = 0mA
Microphone inputs MIC- and MIC+ (pin 6 and 7)
| Z
i
|
Input inpedance
Between MIC- and MIC+
Differential
MIC- or MIC+ to V
EE
Single-ended
CMRR
Common mode rejection
ratio
G
V
Voltage gain MIC+ or MIC- I
line
= 15mA
to LN
R7 = 68
k§
Ù
¥ Ä
vf
G
Gain
variation
with f = 300 and 3400 Hz
frequency
referred
to
800Hz
Voltage drop over circuit
between LN and V
EE
with
external resistor R
VA
Supply current
Supply voltage available for
peripheral circuitry
GL6962
2.2
-
2.2
-
2.7
3.4
2.7
3.4
-
-
-
-
V
V
V
V
-
-
-
50.5
-
64
34
82
52.0
¡ ¾
.2
0
-
-
-
53.5
-
k§
Ù
k§
Ù
dB
dB
dB
5
