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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ADL5904 датащи(PDF) 24 Page - Analog Devices |
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ADL5904 датащи(HTML) 24 Page - Analog Devices |
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24 / 27 page  ADL5904 Data Sheet Rev. B | Page 24 of 27 Use a two-point or a three-point calibration to establish the slope and intercept values in Equation 10. The procedure for a two-point calibration is as follows: 1. With no RF input signal applied, measure the voltage on the VCAL pin (VCALOFF). 2. Apply an RF input power that is towards the bottom end of the RF input range (RFINLOW). Calculate the associated rms input voltage (VRMSLOW) and measure the voltage on the VCAL pin (VCALLOW). 3. Apply an RF input power that is towards the top end of the RF input range (RFINHIGH). Calculate the associated rms input voltage (VRMSHIGH) and measure the voltage on the VCAL pin (VCALHIGH) pin. 4. Calculate SLOPE using the following equation: Slope = (VCALHIGH − VCALLOW)/(VRMSHIGH − VRMSLOW) 5. Calculate intercept using the following equation: Intercept = VRFIN − (VCAL − VCALOFF)/Slope When the slope and intercept are known, nsert them into the equation for VIN−. − × × = − − Intercept P R Slope V THRESHOLD IN 3 1 10 10 log (11) where PTHRESHOLD is the desired RF power level at which the circuit trips. |
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