Found 3 alternatives for LT5568EUF#PBF by Analog Devices Inc.. Rf Modulators — 16-WQFN Exposed Pad.
RF MODULATR 700MHZ-1.05GHZ 16QFN
RF MODULATOR 1.5GHZ-2.4GHZ 16QFN
RF MODULATOR 1.5GHZ-2.5GHZ 16QFN