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ADL5910ACPZN-R7 Datasheet(PDF) 15 Page - Analog Devices |
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ADL5910ACPZN-R7 Datasheet(HTML) 15 Page - Analog Devices |
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15 / 22 page  Data Sheet ADL5910 Rev. 0 | Page 15 of 22 Alternatively, by measuring the voltage on the VCAL output pin with and without RF power applied, an equation can be derived that establishes a precise relationship between the VIN− voltage and the associated RF input power trip point. Within the linear operating range of the ADL5910, there is a linear relationship between VCAL − VCALOFF and the input voltage on RFIN. VCAL − VCALOFF = Slope × (VRFIN − Intercept) (3) where: VCAL is the measured output voltage on the VCAL pin. VCALOFF is the measured output voltage on the VCAL pin with no RF input signal applied. VRFIN is the RF input power (in dBm) converted into volts rms, that is, 3 1 10 10 log × = − IN RFIN P R V (4) where: R is the characteristic impedance (usually 50 Ω). PIN is the RF input power on the RFIN pin in dBm. Rewriting the equation results in − × × = − − Intercept P R Slope VCAL VCAL IN OFF 3 1 10 10 log (5) The voltage that must be applied to the VIN− pin for a particular input power is equal to (VCAL − VCALOFF). Therefore, Equation 5 can be rewritten as − × × = − − Intercept P R Slope VIN IN 3 1 10 10 log (6) Use a two-point or a three-point calibration to establish the slope and intercept values in Equation 6. The procedure for a two- point calibration follows: 1. With no RF input signal applied, measure the voltage on the VCAL pin (VCALOFF). 2. Apply an RF input power that is toward the minimum limit of the RF input range (RFINLOW). Calculate the associated input voltage ( LOW RFIN V ) and measure the voltage on the VCAL pin (VCALLOW). 3. Apply an RF input power that is toward the maximum limit of the RF input range (RFINHIGH). Calculate the associated input voltage ( HIGH RFIN V ) and measure the voltage on the VCAL pin (VCALHIGH) pin. 4. Calculate the slope by using the following equation: Slope = (VCALHIGH − VCALLOW)/( HIGH RFIN V − LOW RFIN V ) 5. Calculate the intercept by using the following equation: Intercept = VRFIN − (VCAL − VCALOFF)/Slope When the slope and intercept are known, insert them into Equation 6, where PTHRESHOLD is the desired RF power level at which the circuit trips. − × × = − − Intercept P R Slope VIN THRESHOLD 3 1 10 10 log |
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