Look, I'll be fair. 80% of the schematics I work with (not drawn by me)
represent SAW filters as an empty rectangle with four ports with pin
numbers. Some however, omit the pin numbers, and show only one ground
connection. Same for elliptical filters and many other things. Such as
voltage regulators and 3-pin reset chips. I don't do it like that, I don't
like it, but that is everyday reality.

Peter

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