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TEA1065T データシート(PDF) 11 Page - NXP Semiconductors

部品番号 TEA1065T
部品情報  Versatile telephone transmission circuit with dialler interface
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メーカー  PHILIPS [NXP Semiconductors]
ホームページ  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TEA1065T データシート(HTML) 11 Page - NXP Semiconductors

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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 VEE. 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
µH
75
µH
34.8
34.8
75
µH
75
µH
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
Ω.
handbook, full pagewidth
MBA549
−7
−5
−3
−1
1
0
∆Gv
(dB)
Iline (mA)
80
60
40
20
0
118 k
Ω 147 kΩ
86.6 k
R6 =
R6 =
187 k


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