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rf power measurement chip ADL5920? Any suggestions

Hi,

   I went through ADL5920 datasheet and need few clarifications

[1] how to interface ADL5920 with a generic chip [any given MicroController say low power ARM 40Mhz chip] to read the values output of the ADL5920?

"The detector output voltages, available at the VRMSF and VRMSR pins, are proportional to the forward and reflected power in dBm"

[2] How to measure power in specific band with FreqMin to FreqMax Range. How to input these values?

[3] Are there any other IC's with ADI which can do RF measurement in any given Freq Range and has a interface like I2C/SPI. Like all in one chip.

Thanks

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  • Hello,

    1) ADL5920 detectors each have a slope and intercept. After measuring output voltage, the forward or reflected power is easily calculated, knowing the slope and intercept as constants. Reference datasheet page 21. Make sure the MCU analog inputs are specified to cover the full detector analog output voltage range, which is about 0 to 4 Volts.

    2) ADL5920 is normally used with a PLL synthesizer or other equivalent RF source which sets the intended measurement frequency. 

    3) I'll let other persons help answer this question.    -Bruce H. 

Reply
  • Hello,

    1) ADL5920 detectors each have a slope and intercept. After measuring output voltage, the forward or reflected power is easily calculated, knowing the slope and intercept as constants. Reference datasheet page 21. Make sure the MCU analog inputs are specified to cover the full detector analog output voltage range, which is about 0 to 4 Volts.

    2) ADL5920 is normally used with a PLL synthesizer or other equivalent RF source which sets the intended measurement frequency. 

    3) I'll let other persons help answer this question.    -Bruce H. 

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