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TEA1113/C1

Low voltage versatile telephone transmission circuit with dialler interface

Philips Electronics 

Philips Semiconductors

Low voltage versatile telephone

transmission circuit with dialler interface

Product specification

TEA1113

In practice, Zline varies considerably with the line type and

the line length. Therefore, the value chosen for Zbal should

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 Zbal and the impedance of the average

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.

LN

handbook, halfpage

LEQ

RP

RCC

619 Ω

Vref

SLPE

VEE

RSLPE

20 Ω

REG

CREG

4.7 µF

VCC

CVCC

100 µF

MBE788

Leq = CREG × RSLPE × RP; RP = internal resistance; RP = 15.5 kΩ.

Fig.7 Equivalent impedance between LN and VEE.

4

handbook, halfpage

Ip

(mA)

3

MBG016

2

(2)

(1)

1

0

0

1

2

(1) With RVA resistor.

(2) Without RVA resistor.

3

4

VCC (V)

Fig.6 Typical current IP available from VCC for

peripheral circuits at Iline = 15 mA.

1997 Mar 27

8

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