I am trying to see if this detector could be used in the IF chain for a heterodyne radiometer application where a square-law detector is commonly used. I don't think the log-linear renders it inappropriate per se.
I expect to use LNAs before the detector, but would need to have an idea of the noise contribution of the detector at the expected input power of ~-30dBm. The spec has 22uV rms in 1 to 6.5 kHz band for 0 dBm input. The RF input would be 4 to 20 GHz.