What Is a Ceramic Resonator?
A ceramic resonator is a piezoelectric component that produces a frequency reference similarly to a crystal, but is cheaper and less stable.
How Does It Work?
Instead of quartz it uses a piezoelectric ceramic material. This material also enters resonance at a certain frequency; but its stability isn't as high as quartz.
Difference From a Crystal
A ceramic resonator is cheaper and smaller; in most models the required load capacitors are built in, so it needs no external components. In return, its frequency accuracy is lower than a crystal's.
| Property | Ceramic Resonator | Crystal |
|---|---|---|
| Accuracy | Medium (~0.5%) | High (ppm) |
| Cost | Low | Higher |
| External capacitor | Usually built-in | Required |
When Is It Preferred?
It's ideal in applications where full accuracy isn't needed and cost and space are priorities. For example, it's enough for an MCU's general clock; but where precise timing is needed, like UART, a crystal is required.
Where Is It Used?
Remote controls, toys, home appliances, low-cost MCU boards and consumer devices where accuracy isn't critical.
Three-Terminal Structure
Most ceramic resonators are three-terminal: two signal terminals and a ground terminal in the middle. The middle terminal lets the required load capacitors be connected internally; this removes the need to add external capacitors and simplifies the board design.
Common Mistakes
- Precise timing: in places like USB/UART the resonator's accuracy may not be enough.
- Confusing types: models with internal/external capacitors differ.
- Temperature: over a wide temperature range the deviation increases.
Frequently Asked Questions
Can it be used instead of a crystal?+
Why is it cheaper?+
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