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UTCTEA1062A View Datasheet(PDF) - Unisonic Technologies

Part NameDescriptionManufacturer
UTCTEA1062A LOW VOLTAGE TELEPHONE TRANSMISSION CIRCUIT WITH DIALLER INTERFACE UTC
Unisonic Technologies UTC
UTCTEA1062A Datasheet PDF : 13 Pages
1 2 3 4 5 6 7 8 9 10 Next Last
UTCTEA1062/1062A LINEARINTEGRATEDCIRCUIT
LN
Leq
Rp
R1
Vref
REG
VCC
C3
C1
R9
4.7 µF 100 µF Rp=16.2k
20
VEE
Leq=C3*R9*Rp
Fig.3 Equivalent impedance circuit
The anti-sidetone network for the UTCTEA1062/1062A family shown in Fig.4 attenuates the signl 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.5 shows a convertional 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.
R1
R2
Zline
VEE
im
R3
IR
Rt
R9
R8
Zbal
SLPE
R1
R2
Zline
VEE
im
IR
Rt
R9
SLPE
R8
RA
Fig 4 Equivalent circuit of UTC TEA1062/1062A
anti-sidetone bridge
Fig 5 Equivalent circuit of an anti-sidetone
network in a wheatstone bridge configuration
UTC UNISONIC TECHNOLOGIES CO., LTD. 8
QW-R108-001,A
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