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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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TDA7498 Fiches technique(PDF) 21 Page - STMicroelectronics |
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TDA7498 Fiches technique(HTML) 21 Page - STMicroelectronics |
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21 / 28 page  TDA7498 Applications information Doc ID 16107 Rev 8 21/28 4.3 Gain setting The gain of the TDA7498 is set by the two inputs, GAIN0 (pin 30) and GAIN1 (pin31). Internally, the gain is set by changing the feedback resistors of the amplifier. 4.4 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 22. For Ci = 470 nF the high-pass filter cutoff frequency is below 20 Hz: fC = 1 / (2 * π * Ri * Ci) Figure 22. Input circuit and frequency response Table 8. Gain settings GAIN0 GAIN1 Nominal gain, Gv (dB) LL 25.6 LH 31.6 HL 35.6 HH 37.6 Ri Input Ci Rf Input pin signal |
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