TEA1067/C2 Philips Semiconductors (Acquired by NXP), TEA1067/C2 Datasheet - Page 8

• Manufacturer Part Number: TEA1067/C2
• Description: TEA1067; Low Voltage Versatile Telephone Transmission Circuit With Dialler Interface;; Package: SOT102-1 (DIP18), SOT163 (SO20)
• Manufacturer: Philips Semiconductors (Acquired by NXP)

Philips Semiconductors
Example
The line balance impedance (Z
suppression is present can be calculated by:
suppose Z
5 km line of 0.5 mm diameter, copper, twisted-pair cable
matched to 600
When k = 0.64 then R8 = 390 ;
Z
More information can be found in the designer guide; 9398 341 10011
June 1990
handbook, full pagewidth
handbook, full pagewidth
bal
Low voltage versatile telephone
transmission circuit with dialler interface
= 130
line
= 210
Fig.6 Equivalent circuit of an anti-sidetone network in a Wheatstone bridge configuration.
(820 //220 nF).
(176 /km; 38 nF/km).
(1265 //140 nF), representing a
Fig.5 Equivalent circuit of TEA1060 anti-sidetone bridge.
bal
Z line
Z line
) at which the optimum
V EE
V EE
R1
R1
R9
R9
SLPE
SLPE
LN
LN
i m
i m
R8
8
R2
R8
Z bal
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.
R3
Z bal
R A
IR
IR
R t
R t
MSA500
MSA501
Product specification
TEA1067