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TEA1065T データシート(PDF) 11 Page - NXP Semiconductors |
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TEA1065T データシート(HTML) 11 Page - NXP Semiconductors |
11 / 28 page 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 Ω 34.8 Ω 75 µH 75 µH 34.8 Ω 34.8 Ω 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 Ω R6 = ∞ R6 = 187 k Ω |
同様の部品番号 - TEA1065T |
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同様の説明 - TEA1065T |
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