The standard describes passive band-pass filters operating over the frequency range of a few kHz to more than 10 MHz which are commerically available as separate and independent units.
DS/EN 60368-2-2:2000 history
2000DS/EN 60368-2-2:2000 Piezoelectric filters - Part 2: Guide to the use of piezoelectric filters - Section 2: Piezoelectric ceramic filters