TEA1113 Philips Semiconductors, TEA1113 Datasheet - Page 8

• Manufacturer Part Number: TEA1113
• Description: Low voltage versatile telephone transmission circuit with dialler interface
• Manufacturer: Philips Semiconductors

Philips Semiconductors
In practice, Z
the line length. Therefore, the value chosen for Z
be for an average line length which gives satisfactory
sidetone suppression with short and long lines.
The suppression also depends on the accuracy of the
match between Z
line.
The anti-sidetone network for the TEA1113 (as shown in
Fig.14) attenuates the receiving signal from the line by
32 dB before it enters the receiving amplifier.
The attenuation is almost constant over the whole audio
frequency range.
A Wheatstone bridge configuration (see Fig.11) may also
be used.
More information on the balancing of an anti-sidetone
bridge can be obtained in our publication “Applications
Handbook for Wired Telecom Systems, IC03b” , order
number 9397 750 00811.
1997 Mar 27
handbook, halfpage
Low voltage versatile telephone
transmission circuit with dialler interface
(1) With R
(2) Without R
Fig.6
(mA)
I p
4
3
2
1
0
0
Typical current I
peripheral circuits at I
VA
line
resistor.
VA
varies considerably with the line type and
resistor.
bal
1
and the impedance of the average
P
2
available from V
(2)
line
= 15 mA.
3
(1)
V CC (V)
MBG016
CC
bal
4
for
should
8
handbook, halfpage
L
Fig.7 Equivalent impedance between LN and V
eq
= C
REG
R
V EE
SLPE
LN
SLPE
R
P
; R
L EQ
R SLPE
20
V ref
P
= internal resistance; R
REG
R P
4.7 F
C REG
Product specification
V CC
R CC
619
100 F
C VCC
MBE788
TEA1113
P
= 15.5 k .
EE
.