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參數(shù)資料
| 型號： | TEA1069H |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | Versatile speech/dialler/ringer with music-on-hold |
| 中文描述： | TELEPHONE MULTIFUNCTION CKT, PQFP44 |
| 封裝： | PLASTIC, QFP-44 |
| 文件頁數(shù)： | 13/44頁 |
| 文件大?。?/td> | 301K |
| 代理商： | TEA1069H |
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1998 Jan 08
13
Philips Semiconductors
Product specification
Versatile speech/dialler/ringer with
music-on-hold
TEA1069; TEA1069A
S
IDETONE SUPPRESSION
Suppression of the transmitted signal in the earpiece is
obtained by the anti-sidetone network comprising R1//Z
line
,
R2, R3, R8, R9 and Z
bal
(see Fig.10). The maximum
compensation is obtained when the following conditions
are fulfilled:
R9
R2
×
R1
R3
R8
+
(
)
×
=
(1)
(2)
(3)
The scale factor k is chosen to meet the compatibility with
a standard capacitor from the E6 or E12 series for Z
line
.
In practice, Z
line
varies considerably with the line type and
length. Therefore, the value chosen for Z
bal
should be for
an average line length thus giving optimum setting for
short or long lines.
Example:
the balance impedance Z
bal
at which the
optimum suppression is present can be calculated as
k
R3
R2
R9
R9
+
×
(
)
)
--R8
×
=
Z
bal
k
Z
line
×
=
follows:
suppose Z
line
= 210
+ (1265
//140 nF) representing a
5 km line of 0.5 mm diameter, copper, twisted-pair cable
matched to 600
(176
/km; 38 nF/km).
When k = 0.64 then R8 = 390
;
Z
bal
= 130
+ (820
//220 nF).
The anti-sidetone network for the TEA1069 and
TEA1069A shown in Fig.10 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. Figure 11 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. More
information on the balancing of anti-sidetone bridges can
be found in our publication “Applications Handbook for
Wired telecom systems, IC03b” order number
9397 750 00811.
Fig.10 Equivalent circuit of TEA1069 and TEA1069A anti-sidetone bridge.
handbook, full pagewidth
MSA500 - 1
IR
R3
R8
SLPE
R9
Zline
VEE
Zbal
im
Rt
R1
R2
LN
相關PDF資料 |
PDF描述 |
|---|---|
| TEA1069N | Versatile speech/dialler/ringer with music-on-hold |
| TEA1081 | Supply circuit with power-down for telephone set peripherals |
| TEA1081T | Supply circuit with power-down for telephone set peripherals |
| TEA1083 | Call progress monitor for line powered telephone sets |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TEA1069N | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Versatile speech/dialler/ringer with music-on-hold |
| TEA1081 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Supply circuit with power-down for telephone set peripherals |
| TEA1081T | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Supply circuit with power-down for telephone set peripherals |
| TEA1083 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Call progress monitor for line powered telephone sets |
| TEA1083A | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Call progress monitor for line powered telephone sets |
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