Analog Devices Inc. DC2932A Demonstration Circuit for LTC5597

Analog Devices Inc. DC2932A Demonstration Circuit provides a reference design for the LTC5597 RMS Power Detector. The LTC5597 has an RMS response that measures RF and microwave signals from 100MHz to 70GHz. The input signal converts to a DC voltage that is logarithmically proportional to the input signal level. The LTC5597 is capable of detecting signals of as low as -37dBm and offers an input dynamic range up to 35dB, achieving 1dB accuracy, depending on frequency.

The PCB layout of the DC2932A Demonstration Circuit employs the recommended microstrip transmission line structure, as well as the recommended endpoint transitions. Input impedance to the LTC5597 is internally matched to 50Ω. The reference design is suitable for RMS measurements of high crest factor waveforms up to 12dB peak/average ratio. No external coupling capacitor is necessary if the DC voltage at RF_IN pin is kept below 1V.