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TEA1110A 数据表(PDF) 9 Page - Unisonic Technologies

部件名 TEA1110A
功能描述  LOW VOLTAGE VERSATILE TELEPHONE TRANSMISSION CIRCUIT WITH DIALLER INTERFACE
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制造商  UTC [Unisonic Technologies]
网页  http://www.utc-ic.com
标志 UTC - Unisonic Technologies

TEA1110A 数据表(HTML) 9 Page - Unisonic Technologies

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TEA1110A
LINEAR INTEGRATED CIRCUIT
UNISONICTECHNOLOGIESCO.,LTD
9 of 9
www.unisonic.com.tw
QW-R108-014.C
FUNCTIONAL DESCRIPTION(Cont.)
SIDETONE SUPPRESSION
The UTC TEA1110A anti-side tone network consisting of RCC//Zline, Rast1, Rast2, Rast3, RSLPE and Zbal (see
Fig.6) suppresses the transmitted signal in the earpiece. Maximum compensation is obtained under the following
conditions:
RSLPE×Rast1=RCC× (Rast2+Rast3)
)
R
×
1
Rast
(
))
R
+
3
Rast
(
×
2
Rast
(
=
K
SLPE
SLPE
Zbal= k×ZIine
The scale factor k is mainly for the compatibility with a standard capacitor from the E6 or E12 range for Zbal.
Zline varies considerably with the line type and the line length in practice. Therefore, the Zbal value should be
set to be an average line length which gives appropriate side tone suppression with short and long lines. The
suppression also depends on the accuracy of the match between Zbaland the impedance of the average line.
The receiving signal is to be attenuated 32dB by the anti-side tone network from the line before it enters the
receiving amplifier, and the attenuation is almost constant over the whole audio frequency range.
Im
Zbal
SLPE
IR
VEE
Zline
LN
Zir
Fig.6 Equivalent circuit of UTC TEA1110A anti-sidetone bridge
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.


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