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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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TDA7491MV Scheda tecnica(PDF) 21 Page - STMicroelectronics |
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TDA7491MV Scheda tecnica(HTML) 21 Page - STMicroelectronics |
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21 / 28 page  DocID14576 Rev 4 21/28 TDA7491MV Application information 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 (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 * * Ri * Ci) Figure 21. Device input circuit and frequency response Table 8. Gain settings GAIN0 GAIN1 Nominal gain, Gv (dB) 00 20 01 26 10 30 11 32 Ri Input Ci Rf Input pin signal |
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