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參數(shù)資料
| 型號： | TEA1065 |
| 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, PDIP24 |
| 封裝： | 0.600 INCH, PLASTIC, DIP-24 |
| 文件頁數(shù)： | 11/28頁 |
| 文件大?。?/td> | 154K |
| 代理商： | TEA1065 |
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March 1994
11
Philips Semiconductors
Product specification
Versatile telephone transmission circuit with
dialler interface
TEA1065
Automatic gain control
Automatic compensation of line loss is obtained by connecting a resistor (R6) between AGC and V
EE
. The automatic gain
control varies the gain of the microphone amplifier and receiving amplifier in accordance with the DC line current (see
Fig.12). The control range is 5.9 dB; this corresponds to a line length of 3.5 km of twisted pair cable (see Fig.11). The
DTMF gain is not affected by this feature.
If automatic line loss compensation is not required the AGC pin can be left open-circuit, the amplifiers then give their
maximum gain.
Fig.11 Typical 0.5 km line cell model used for automatic gain control optimization.
handbook, full pagewidth
MBA572
34.8
34.8
75
μ
H
75
μ
H
34.8
34.8
75
μ
H
75
μ
H
24.3 nF
24.3 nF
13 nF
Fig.12 Variation of gain as a function of line current with R6 as a parameter; R9 = 20
.
handbook, full pagewidth
MBA549
7
5
3
1
1
0
Gv
(dB)
Iline (mA)
80
60
40
20
0
118 k
147 k
86.6 k
R6 =
∞
R6 =
187 k
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