We've been using multiple ADL5513 for VSWR measurement, but I am considering using the ADL5519 instead. Low output noise is critical for this application, especially at low frequencies <1kHz. I had asked previously here about noise performance of the ADL5513 below 1kHz, and got a very helpful response. I was hoping to get similar data for the ADL5519, both for the single OUTA/B and difference OUTP/N pins.
Another question: I was very surprised that the datasheet shows near identical noise plots for the single channel outputs vs the difference outputs. I would assume the difference outputs to be 3dB higher since they will sum the noise from each single channel. The additional opamps used for the difference outputs should add even more noise. So how can this be real?