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TEA1067 View Datasheet(PDF) - Philips Electronics

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TEA1067 Datasheet PDF : 28 Pages
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Philips Semiconductors
Low voltage versatile telephone
transmission circuit with dialler interface
Product specification
TEA1067
Example
The line balance impedance (Zbal) at which the optimum
suppression is present can be calculated by:
suppose Zline = 210 Ω + (1265 //140 nF), representing a
5 km line of 0.5 mm diameter, copper, twisted-pair cable
matched to 600 (176 /km; 38 nF/km).
When k = 0.64 then R8 = 390 ;
Zbal = 130 Ω + (820 //220 nF).
The anti-sidetone 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.
Fig.6 shows a conventional Wheatstone bridge
anti-sidetone circuit that can be used as an alternative.
Both bridge types can be used with either resistive or
complex set impedances.
handbook, full pagewidth
LN
Zline
R1
VEE
R9
R2
IR
im
R3
R8
SLPE
Zbal
Rt
MSA500
Fig.5 Equivalent circuit of TEA1060 anti-sidetone bridge.
handbook, full pagewidth
LN
Zline
R1
VEE
R9
Zbal
im
R8
IR
Rt
RA
SLPE
MSA501
Fig.6 Equivalent circuit of an anti-sidetone network in a Wheatstone bridge configuration.
More information can be found in the designer guide; 9398 341 10011
June 1990
8
 

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