TEA1068 datasheet(7/24 Pages) PHILIPS

部件名	TEA1068

功能描述	Versatile telephone transmission circuit with dialler interface

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制造商	PHILIPS [NXP Semiconductors]

网页	http://www.nxp.com

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7 / 24 page

1996 Apr 23

7

Philips Semiconductors

Product speciﬁcation

Versatile telephone transmission circuit

with dialler interface

TEA1068

If fixed values are chosen for R1, R2, R3 and R9, then

condition (1) will always be fulfilled, provided that

R8//Zbal << R3. To obtain optimum side-tone

suppression, condition (2) has to be fulfilled, resulting in:

Zbal = (R8/R1) Zline = k × Zline, where k is a scale factor:

k

= (R8/R1).

Scale factor k (dependent on the value of R8) must be

chosen to meet the following criteria:

1. Compatibility with a standard capacitor from the E6 or

E12 range for Zbal

2.

Zbal//R8<< R3 to fulfil condition (1) and thus

ensuring correct anti-side-tone bridge operation

3.

Zbal +R8>> R9 to avoid influencing the transmitter

gain.

In practice, Zline varies greatly with the line length and

cable type; consequently, an average value has to be

chosen for Zbal, thus giving an optimum setting for short or

long lines.

Example: the balanced line impedance (Zbal) at which the

optimum suppression is preset can be calculated by:

Assume Zline = 210 Ω + (1265 Ω/140 nF), representing a

5 km line of 0.5 mm diameter, copper, twisted-pair cable

matched to 600

Ω (176 Ω/km; 38 nF/km). When k = 0.64,

then R8 = 390

Ω; Zbal = 130 Ω + (820 Ω//220 nF).

The anti-side-tone network for the TEA1060 family shown

in Fig.5 attenuates the signal received from the line by

32 dB before it enters the receiving amplifier.

The attenuation is almost constant over the whole audio

frequency range.

Figure 6 shows a conventional Wheatstone bridge

anti-side-tone circuit that can be used as an alternative.

Both bridge types can be used with either resistive or

complex set impedances.

Fig.5 Equivalent circuit of TEA1060 family anti-side-tone bridge.

handbook, full pagewidth

MSA500

R1

R2

R9

R3

IR

R8

VEE

SLPE

LN

Zline

Rt

im

Zbal

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