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參數(shù)資料
| 型號(hào)： | TEA1065T |
| 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, PDSO24 |
| 封裝： | PLASTIC, SO-24 |
| 文件頁數(shù)： | 13/28頁 |
| 文件大?。?/td> | 154K |
| 代理商： | TEA1065T |
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March 1994
13
Philips Semiconductors
Product specification
Versatile telephone transmission circuit with
dialler interface
TEA1065
The maximum hook-off current then becomes:
I
hook-off
= V
Z
/R1
+
V
BE
×
(R9a
+
R9b
+
R1)/(R1
×
R9b)
where V
Z
is the Zener voltage of diode D5 (see Fig.18).
Side-tone suppression
Suppression of the transmitted signal in the earpiece is
obtained by the anti-sidetone network comprising R1//Z
line
,
R2, R3, R9 and Z
bal
(see Fig.18). Maximum compensation
is obtained when the following conditions are fulfilled:
a) R9
×
R2 = R1
×
(R3
+
R8)
b) k = R3
×
(R8
+
R9)/(R2
×
R9)
c) Z
bal
= k
×
Z
line
The scale factor k is chosen to meet the compatibility with
a standard capacitor from the E6 or E12 range for Z
bal.
In practice Z
line
varies considerably with the line length and
line type. Therefore, the value chosen for Z
bal
should be for
an average line length giving satisfactory sidetone
suppression with long and short times. The suppression
also depends on the accuracy of the match between
Z
bal
and the impedance of the average line.
Example
With k = 1, R1 = 619
, R9 = 20
and an average line
impedance represented by 270
+
(120 nF // 1100
), the
calculation results in:
R2 = 130
k
R3 = 3650
R8 = 715
The anti-sidetone network for the TEA1060 family, shown
in Fig.15, 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.
Note
More information on the balancing of the anti-sidetone
bridges can be obtained in our publication “Versatile
speech transmission ICs for electronic telephone sets”
order number 9398 341 10011.
Fig.14 Example of line current shape in pulse dialling mode (see also Fig.18).
handbook, full pagewidth
MBA568
Iline
Ihook-off
hook-off
speech mode
pulse dialling mode
time
00
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