GL6962/GL6962A
1
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.
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
) for
dynamic, magnetic or piezo-electric microphones
Asymmetrical high-impedance inputs(32k
)
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.
PIN Configuration
(TOP View)
1
2
3
4
5
6
7
8
SLPE
16
15
14
13
12
11
10
9
AGC
REG
V
CC
MUTE
DTMF
IR
V
EE
LN
TGA1
TGA2
QR
RGA
MIC-
MIC+
I
ref
GL6962
* Pin 12 is active LOW(MUTE) for GL6962A
GL6962/GL6962A
2
Block Diagram
* Pin 12 is active LOW (
MUTE
) for GL6962A.
V
CC
8
14
15
9
16
1
4
2
3
10
7
6
11
12
5
13
SUPPLY
&
REFERENCE
CURRENT
REFERENCE
CURRENT
CONTROL
LOW
VOLTAGE
CIRCUIT
-
+
-
+
MUTE
CONTROL
+
_
+
_
dB
RGA
QR
TGA1
LN
TGA2
SLPE
REG
AGC
V
EE
I
ref
DTMF
MIC
IR
MIC-
(1)
MUTE
RM
RM
RGC
TGC
RGC TGC
GL6962/GL6962A
3
Pin Description
PIN NUMBER
SYMBOL
DESCRIPTION
1
LN
Positive line terminal
2
TGA1
Gain adjustment: transmitting amplifier
3
TGA2
Gain adjustment: transmitting amplifier
4
QR
Non-inverting output: receiving amplifier
5
RGA
Gain adjustment: receiving amplifier
6
MIC-
Inverting microphone input
7
MIC+
Non-Inverting microphone input
8
I
ref
Current stabilizer
9
V
EE
Negative line terminal
10
IR
Receiving amplifier input
11
DTMF
Dual-tone multi-frequency input
12
MUTE
Mute input
(1)
13
V
CC
Positive decoupling
14
REG
Voltage regulator decoupling
15
AGC
Automatic gain control input
16
SLPE
Slope (DC resistance) adjustment.
(1) Pin 12 is active LOW (
MUTE
) for GL6962A.
GL6962/GL6962A
4
Absolute Maximum Ratings
SYMBOL
PARAMETER
MIN
MAX
UNIT
V
LN
Positive continuous line voltage
-
12
V
I
line
Line Current
R9 = 20 ; Note1
GL6962 ; GL6962A
-
140
mA
V
i
Input voltage on all other pins
Positive input voltage
Negative input voltage
-
-
V
CC
+0.7
-0.7
V
V
P
tot
Total power dissipation
R9 = 20 ; Note2
GL6962 ; GL6962A
-
666
mW
T
amb
Operating ambient temperature
-25
+75
T
stg
Storage temperature
-40
+125
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. Mostly dependent on the maximum required T
amb
and on the voltage between LN and SLPE.
2. Calculated for the maximum ambient temperature specified T
amb
= 75
and maximum
junction temperature of 125
.
GL6962/GL6962A
5
Electrical Characteristics
I
line
= 11 to 140 mA, V
EE
= 0V, f = 800Hz; T
amb
= 25
; unless otherwise specified
SYMBOL
PARAMETER
CONDITION
MIN
TYP MAX UNIT
Supplies LN and VCC (Pin 1 and 13)
V
LN
Voltage drop over circuit
Between LN and V
EE
MIC inputs open circuit
I
line
= 1mA
I
line
= 4mA
I
line
= 15mA
I
line
= 100mA
I
line
= 140mA
-
-
3.55
4.9
-
1.6
1.9
4.0
5.7
-
-
-
4.25
6.5
7.5
V
V
V
V
V
V
LN
Voltage drop over circuit
between LN and V
EE
with
external resistor R
VA
I
line
= 15mA
R
VA
(LN to REG)=68
k
R
VA
(REG to SLPE)=39
k
-
-
3.5
4.5
-
-
V
V
I
CC
Supply current
V
CC
= 2.8V
-
0.9
1.35
mA
V
CC
Supply voltage available for
peripheral circuitry
GL6962
GL6962A
I
line
= 15mA
MUTE = HIGH
IP = 1.2mA
IP = 0mA
MUTE
= LOW
IP = 1.2mA
IP = 0mA
2.2
-
2.2
-
2.7
3.4
2.7
3.4
-
-
-
-
V
V
V
V
Microphone inputs MIC- and MIC+ (pin 6 and 7)
| Z
i
|
Input inpedance
Differential
Single-ended
Between MIC- and MIC+
MIC- or MIC+ to V
EE
-
-
64
34
-
-
k
k
CMRR Common mode rejection
ratio
-
82
-
dB
G
V
Voltage gain MIC+ or MIC-
to LN
I
line
= 15mA
R7 = 68
k
50.5
52.0
53.5
dB
G
vf
Gain variation with
frequency referred to
800Hz
f = 300 and 3400 Hz
-
0.2
-
dB
PDF 
ZIP