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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TDA7492 датащи(PDF) 24 Page - STMicroelectronics |
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TDA7492 датащи(HTML) 24 Page - STMicroelectronics |
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24 / 32 page  Applications information TDA7492 24/32 Doc ID 14926 Rev 5 6.2 Gain setting The gain of the TDA7492 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. 6.3 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 31. For Ci = 470 nF the high-pass filter cutoff frequency is below 20 Hz: fc = 1 / (2 * π * Ri * Ci) Figure 31. Device input circuit and frequency response Table 7. Gain settings GAIN0 GAIN1 Nominal gain, Gv (dB) 00 21.6 01 27.6 10 31.1 11 33.6 Ri Input Ci Rf Input pin signal |
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