KKA1062/1062A
Zbal
Zline
Automatic line loss compensation is achieved by connecting a
resistor (R6) between AGC and VEE
=
(2)
.
Zbal + R 8
Zline+ R 1
The automatic gain control varies the gain of the microphone
amplifier and the receiving amplifier in accordance with the DC line
current. The control range is 5.8 dB which corresponds to a line
length of 5 km for a
If fixed values are chosen for R1, R2, R3 and R9, then condition (1)
will always be fulfilled when
0.5mm diameter twisted-pair copper cable with a DC resistance of
176 ?/km and average attenuation of
To obtain optimum sidetone suppression, condition (2) has to be
fulfilled which results in:
R 8
1.2dB/km. Resistor R6 should be chosen in accordance with the
exchange supply voltage and its feeding bridge resistance. The ratio
of start and stop currents of the AGC curve is independent of the
value of R6. If no automatic
line-loss compensation is required the AGC pin may be left open-
circuit. The amplifiers, in this condition, will give their maximum
specified gain.
Zbal
=
x Zline = k x Zline
R 1
R 8
R 1
Where k is scale factor; k =
The scale factor k, dependent on the value of R8, is chosen to meet
the following criteria:
- compatibility with a standard capacitor from the E6 or
E12 range for Zbal
- |Zbal//R8|<<R8 fulfilling condition (a) and thus
ensuring correct
Sidetone suppression
The anti-sidetone network, R1//Zline, R2, R3, R8, R9 and Zbal
suppresses the transmitted signal in the earpiece. Maximum
compensation is obtained when the following conditions are fulfilled:
anti-sidetone bridge operation
- |Zbal + R8|>>R9 to avoid influencing the transmit gain.
R 8 x Zbal
⎛
⎞
In practise Zline varies considerably with the line type and length. The
value chosen for Zbal should therefore be for an average line thus
giving optimum setting for short or long lines.
R9 x R2 = R1 x R 3 +
(1)
⎜
⎝
⎟
⎠
R 8 + Zbal
ABSOLUTE MAXIMUM RATING
Characteristic
Symbol
Test Condition
Min
Typ
Max
Unit
Positive Continuous Line Voltage
Repetitive Line Voltage During Switch-on
or Line Interruption
VLN
VLN(R)
12
13.2
V
V
Repetitive Peak Line Voltage for a 1ms
Pulse per 5s
VLN(RM)
28
V
R9 = 20Ω; R10 = 13Ω;
see Fig.6
Line Current
Input Voltage on all other Pins
Total Power
Dissipation
Operating Ambient Temperature
Storage Temperature
Iline
VI
Ptot
140
VCC+0.7
0.58
0.67
+75
mA
V
W
R9 = 20Ω; note 1
R9 = 20Ω; note 2
-0.7
Standard DIP
DIP with heatsink
TA
Tstg
Tj
-25
-40
oC
oC
oC
+125
+125
Junction Temperature
Notes
1. Mostly dependent on the maximum required TA and on the voltage between LN and SLPE.
2. Calculated for the maximum ambient temperature specified and a maximum junction temperature of 125oC.
(Thermal Resistance RJA = 85oC/W for standard DIP and RJA = 75oC/W for special DIP with heatsink).
150
LN (mA)
130
150
I
I
LN (mA)
130
110
90
(1)
110
90
(1)
(2)
(3)
(4)
(2)
(3)
(4)
70
70
(1) TA = 45oC; Ptot = 0.94 W
(2) TA = 55oC; Ptot = 0.82 W
(3) TA = 65oC; Ptot = 0.71 W
(4) TA = 75oC; Ptot = 0.58 W
(1) TA = 45oC; Ptot = 1.07 W
(2) TA = 55oC; Ptot = 0.93 W
(3) TA = 65oC; Ptot = 0.80 W
(4) TA = 75oC; Ptot = 0.67 W
50
30
50
30
4
6
8
10
12
2
4
6
8
10
12
2
V
LN - VSLPE (V)
V
LN - VSLPE (V)
Fig.3a Safe operating area
(Standard DIP)
Fig.3b Safe operating area
(DIP with HS)
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