I want to detect rms values from pure sin waves from DC to 100 MHz with the ADL5511, is this posible with this ic?
Yes, you are correct. I mixed up the scaling factor on the VENV and VRMS outputs in my original post. At 100 MHz, the VRMS output has a typical scaling factor or 1.92 V/Vrms but this number will vary from device to device.
Yes, you can use ADL5511 to measure rms signal strength. Just remember that the transfer function is not calibrated. The nominal output voltage is equal to 1.46 times the rms of the input voltage (e.g. if the input signal is 1 V RMS, the output dc voltage will be 1V but this will vary from device to device. So calibration is necessary.
The input path has to be ac-coupled. So you can use a large input coupling capacitor to get you down to arbitrarily low frequencies but not dc. Also, you need to attach some capacitors to the ADL5511 to facilitate low frequency operation. The equations for these capacitance sizes are in the datasheet.
Thank you enash for the answer!, i read in the datasheet tha the gain for 100 MHz envelope(the range i need) would be 1.92 V/Vrms (e.g. if the input signal is 1 V RMS, the output dc voltage will be 1.92V in the pin Vrms) is that correct?
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