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參數(shù)資料
| 型號： | 935263971112 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 通信及網(wǎng)絡(luò) |
| 英文描述： | SPECIALTY TELECOM CIRCUIT, PDSO28 |
| 封裝： | PLASTIC, SOT-136, SO-28 |
| 文件頁數(shù)： | 4/38頁 |
| 文件大小： | 287K |
| 代理商： | 935263971112 |
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1999 Feb 17
12
Philips Semiconductors
Product specication
Cordless telephone, answering machine
line interface
UBA1707
Fig.9 Receive amplifier.
handbook, full pagewidth
MGK711
VI
V
I
RXM
2Vd
from AGC
RXI
RXO
UBA1707
Bit names are given in italics.
SIDETONE SUPPRESSION
The UBA1707 anti-sidetone network comprising
ZSET//Zline, Rast1, Rast2, Rast3, RSLPE and Zbal (see Fig.10)
suppresses the transmitted signal in the received signal.
Maximum compensation is obtained when the following
conditions are fulfilled:
RSLPE × Rast1 =ZSET × (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.
k
R
ast2
R
ast3
R
SLPE
+
()
×
()
R
ast1
R
SLPE
×
()
--------------------------------------------------------------------
=
Therefore, the value chosen for Zbal should be 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 UBA1707 (see Fig.18)
attenuates the receiving signal from the line by 38 dB
before it enters the receiving amplifier. The attenuation is
almost constant over the whole audio frequency range.
A Wheatstone bridge configuration (see Fig.11) may also
be used.
More information on the balancing of an anti-sidetone
bridge can be obtained in our publication
“Applications
Handbook for Wired Telecom Systems, IC03b”.
handbook, full pagewidth
MGL216
Im
ZRXI
RXI
Rast1
Rast3
Rast2
SLPE
RSLPE
GND
Zline
ZSET
LN
Zbal
Fig.10 Equivalent circuit of UBA1707 anti-sidetone bridge.
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