ADL5904 datasheet(24/27 Pages) AD

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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

Slope

THRESHOLD

log

(11)

where PTHRESHOLD is the desired RF power level at which the

circuit trips.

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