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參數(shù)資料
| 型號(hào)： | TEA1068T |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | Versatile telephone transmission circuit with dialler interface |
| 中文描述： | TELEPHONE SPEECH CKT, PDSO20 |
| 封裝： | PLASTIC, SO-20 |
| 文件頁數(shù)： | 7/24頁 |
| 文件大?。?/td> | 168K |
| 代理商： | TEA1068T |
1996 Apr 23
7
Philips Semiconductors
Product specification
Versatile telephone transmission circuit
with dialler interface
TEA1068
If fixed values are chosen for R1, R2, R3 and R9, then
condition (1) will always be fulfilled, provided that
R8//Z
bal
<< R3. To obtain optimum side-tone
suppression, condition (2) has to be fulfilled, resulting in:
Z
bal
=
(R8/R1) Z
line
=
k
×
Z
line
, where k is a scale factor:
k
=
(R8/R1).
Scale factor k (dependent on the value of R8) must be
chosen to meet the following criteria:
1.
Compatibility with a standard capacitor from the E6 or
E12 range for Z
bal
2.
Z
bal
//R8
<< R3 to fulfil condition (1) and thus
ensuring correct anti-side-tone bridge operation
Z
bal
+ R8
>> R9 to avoid influencing the transmitter
gain.
3.
In practice, Z
line
varies greatly with the line length and
cable type; consequently, an average value has to be
chosen for Z
bal
, thus giving an optimum setting for short or
long lines.
Example:
the balanced line impedance (Z
bal
) at which the
optimum suppression is preset can be calculated by:
Assume 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-side-tone network for the TEA1060 family shown
in Fig.5 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 6 shows a conventional Wheatstone bridge
anti-side-tone circuit that can be used as an alternative.
Both bridge types can be used with either resistive or
complex set impedances.
Fig.5 Equivalent circuit of TEA1060 family anti-side-tone bridge.
handbook, full pagewidth
MSA500
R1
R2
R9
R3
IR
R8
VEE
SLPE
LN
Zline
Rt
im
Zbal
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TEA1069 | Versatile speech/dialler/ringer with music-on-hold |
| TEA1069A | Versatile speech/dialler/ringer with music-on-hold |
| TEA1069AH | Versatile speech/dialler/ringer with music-on-hold |
| TEA1069H | Versatile speech/dialler/ringer with music-on-hold |
| TEA1069N | Versatile speech/dialler/ringer with music-on-hold |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TEA1069 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Versatile speech/dialler/ringer with music-on-hold |
| TEA1069A | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Versatile speech/dialler/ringer with music-on-hold |
| TEA1069AH | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Versatile speech/dialler/ringer with music-on-hold |
| TEA1069H | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Versatile speech/dialler/ringer with music-on-hold |
| TEA1069N | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Versatile speech/dialler/ringer with music-on-hold |
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