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參數(shù)資料
| 型號： | 935260607112 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | TELEPHONE MULTIFUNCTION CKT, PDSO28 |
| 封裝： | PLASTIC, SOT-136, SO-28 |
| 文件頁數(shù)： | 8/56頁 |
| 文件大小： | 360K |
| 代理商： | 935260607112 |
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2000 May 19
16
Philips Semiconductors
Product specication
One-chip telephone ICs with speech,
dialler and ringer functions
UBA2050(A); UBA2051(A;C)
SIDETONE SUPPRESSION
The anti-sidetone network for the UBA205xx, comprising
RCC in parallel with Zline,Rast1,Rast2,Rast3,RSLPE and Zbal
(see Fig.16), suppresses the transmitted signal in the
earpiece. Maximum compensation is obtained when the
following conditions are fulfilled:
RSLPE × Rast1 =RCC × (Rast2 +Rast3)
Zbal =k × Zline
The scale factor k is chosen to meet the compatibility with
a standard capacitor from the E6 or E12 range for Zbal.
In practice, Zline varies considerably with the line type and
the line length. Therefore, the value of Zbal should be
chosen for an average line length, which gives satisfactory
sidetone suppression with short and long lines.
The suppression also depends on the accuracy of the
match between Zbal and the impedance of the average
line.
The anti-sidetone network for the UBA205xx attenuates
the received signal from the line by 32 dB before it enters
the receive stage. The attenuation is almost constant over
the whole audio frequency range.
A Wheatstone bridge configuration (see Fig.17) may also
be used.
More information on the balancing of an anti-sidetone
bridge can be obtained in our publication
“Application
Handbook for Wired Telecom Systems, IC03b”.
k
R
ast2
R
ast3
R
SLPE
+
()
×
R
ast1
R
SLPE
×
-----------------------------------------------------------
=
handbook, full pagewidth
MGT046
Im
Zir
IR
Rast1
Rast3
Rast2
SLPE
RSLPE
GND
Zline
RCC
LN
Zbal
Fig.16 Equivalent circuit of UBA205xx anti-sidetone bridge.
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