Discussion
What is the relation between a crystal's two resonant frequencies?
Answer: C
The parallel resonance sits just above the series one, typically by a few tenths of a per cent, and between them the crystal is inductive - which is exactly the region a Pierce oscillator uses. A crystal specified for series operation and one for parallel operation at the same nominal frequency are physically different parts. Knowing which resonance a circuit uses is essential when ordering a crystal, since the wrong one lands the frequency off by that few tenths of a per cent.
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