The LTC5577 IF gain seems to have a lot of ripple, looking at the datasheet figure 11.
What is the expected ripple and gain when using a 40-80MHz IF (with, say RF: 1500-4500MHz)?
There's no reason that the LTC5577 can't be used with low side LO injection for your application. Just be sure to match the ports to the frequency range of interest, and the mixer should work as expected.
Weston SapiaSr. Applications…
There are 2 tables (5 and 6) in the datasheet of mixer LTC5576 on the page 19. Unfortunately I cannot find "input RF level" under measurement conditions as it is noticed for other mixers (e.g. LTC5577 tables 6a, 6b in the datasheet) standardly…