Regarding AD5511

Hello sir,

I want to measure RMS voltage of 5.8 GHz signal using AD5511.

what is the appropriate ADC to measure RMS voltage?

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  • +1
    •  Analog Employees 
    on Jan 8, 2020 3:42 AM

    Hi amitholey,

    You mean ADL5511, correct?

    The ADL5511 RMS detector block has provision for external square-domain averaging via a capacitor on pin 14, FLT4. Normally the external capacitor is chosen to smooth out the measurement and reduce the error effect that RF modulation would have contributed to the rms measurement. The larger the capacitor, the lower the ADC sample rate requirement. See datasheet Eq. (2) and Eq. (8), and Table 4. The ADC sample rate should be at least several times higher than fFLT4. ADC input range is recommended to include at least 0 to 3.8V, which is the output voltage range for VRMS, pin 11. ADC resolution is as required for the application, normally around 10 to 12 bits. 

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  • +1
    •  Analog Employees 
    on Jan 8, 2020 3:42 AM

    Hi amitholey,

    You mean ADL5511, correct?

    The ADL5511 RMS detector block has provision for external square-domain averaging via a capacitor on pin 14, FLT4. Normally the external capacitor is chosen to smooth out the measurement and reduce the error effect that RF modulation would have contributed to the rms measurement. The larger the capacitor, the lower the ADC sample rate requirement. See datasheet Eq. (2) and Eq. (8), and Table 4. The ADC sample rate should be at least several times higher than fFLT4. ADC input range is recommended to include at least 0 to 3.8V, which is the output voltage range for VRMS, pin 11. ADC resolution is as required for the application, normally around 10 to 12 bits. 

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