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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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TDA7491MV Fiches technique(PDF) 21 Page - STMicroelectronics |
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TDA7491MV Fiches technique(HTML) 21 Page - STMicroelectronics |
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21 / 28 page  TDA7491MV Application information Doc ID 14576 Rev 2 21/28 7.2 Gain setting The gain of the TDA7491MV is set by the two inputs, GAIN0 (pin 30) and GAIN1 (pin 31). Internally, the gain is set by changing the feedback resistors of the amplifier. 7.3 Input resistance and capacitance The input impedance is set by an internal resistor Ri = 60 k Ω (typical). An input capacitor (Ci) is required to couple the AC input signal. The equivalent circuit and frequency response of the input components are shown in Figure 21. For Ci = 220 nF the high-pass filter cut-off frequency is below 20 Hz: fc = 1 / (2 * π * Ri * Ci) Figure 21. Device input circuit and frequency response Table 8. Gain settings GAIN0 GAIN1 Nominal gain, Gv (dB) 0020 0126 1030 1132 Ri Input Ci Rf Input pin signal |
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