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Ceramic Resonator



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Ceramic Resonator

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Ceramic Resonator General Information

Surface Mount Ceramic Resonator SMD Ceramic Resonator Thru Hole Ceramic Resonator Crystal Ceramic Resonator
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Ceramic resonators implement the mechanical resonance of piezoelectric ceramics (commonly Lead Zirconate Titanate) (PZT), that result in different vibration behaviors (modes) depending on the resonance frequency. Resonator design utilizes this ceramic substrate by applying two metal electrodes evenly placed on both the top and bottom of the substrate. When voltage is applied, vibration of the ceramic substrate occurs between the electrodes. The thickness of the ceramic substrate determines the resonant frequency of the resonator.

Ceramic Resonators provide a viable alternative to Quartz Crystals for oscillation frequency stabilization. Although Ceramic Resonators inherently reduce the precision for which frequencies can be controlled as compared to Quartz Crystals, and other Quartz based products, the benefits of Ceramic Resonators can outweigh these shortcomings in many applications:

1. Production Costs:
Because of the difference in materials as compared to Quartz Crystals, Ceramic Resonators are more easily mass produced. When using package size versus cost as the basis for comparison, Ceramic Resonators are approximately 25 - 50% less expensive to produce in the surface mount package category, and approximately 50 - 75% less expensive to produce in the though hole package category as compared to Quartz Crystal products.

2. Package Size:
Ceramic Resonators can be manufactured in a smaller packages than their Quartz counterparts, thereby increasing their attractiveness where board space is limited. Surface Mount Ceramic Resonators are also available.

3. Mechanical Ruggedness:
Ceramic Resonators handle shock and vibration better then their Quartz counterparts.

4. Component Count Reduction:
Most Oscilent Ceramic Resonator Series allow for inclusion of built-in capacitors thereby eliminating the need for external loading capacitors.

5. Other Considerations:
Because of their use of mechanical resonance, in principle, Ceramic Resonators are better equipped to handle fluctuations in external circuit or power supply voltage, providing stable oscillation without adjustment. Further, these characteristics provide for a much faster rise times and are independent of drive level considerations.

Understanding the Oscillation Circuit

Rt: Feedback Resistor:
A Feedback Resistor is used to determine the oscillation circuit bias. The feedback resistance will contribute to instability if it is too large by reducing feedback. Conversely, if it is too small, increases in current will be realized thereby reducing gain. Recent developments in IC design allows for the integration of the feedback resistor in many cases.

C1/C2: Loading Capacitor:
The Stability of the Oscillation circuit is largely determined by the C1/C2 values. If the load capacitance is too high, a stop in oscillation can be expected. If too small, unstable oscillation will occur because of oscillation waveform distortion. When comparing the same IC, oscillation circuits with lower frequencies require higher capacitance.

Rd: Damping Resistor (optional):
Abnormal harmonic oscillation can be suppressed using a dampening resistor. The dampening resistor and load capacitors work together as a low-pass filter to reduce gain in the MHz range of oscillation.

Rb: Bias resistor (optional):
A Bias Resistor can be utilized in the Ceramic Resonator Oscillation Circuit to change the bias point when a reduction in IC gain is required, or to suppress unstable oscillation. This may be especially considered when a 3 stage buffered IC, or TTL IC, is used. Oscilent Engineering can help with the circuit design if needed.

Oscilent Ceramic Resonator Products

Oscilent offer a full range of industry standard Surface Mount and Through Hole Ceramic Resonators both with and without internal capacitors. For standard Operating Temperatures (-20C to 80C), and for Automotive applications (-40C to +125C), Oscilent offers a wide range of frequencies and frequency stability options. Additionally, our Engineering and Design capabilities allow for custom design and characterization requirements that meet the demands of most applications.

Oscilent is a manufactuer of ceramic resonator and a supplier worldwide for various applications and markets. Oscilent offers standard products and have designers in-house for custom ceramic resonator devices.

PDF Library of Ceramic Resonator Products
Oscilent Series
Number [ pdf spec ]
Type Package Frequency Range html Version

670 ~ 671

Surface Mount ZTACC / ZTTCC 1.79 ~ 8 Mhz
672 ~ 673 Surface Mount ZTACS / ZTTCS 7 ~ 60 MHz
674 ~ 675 Surface Mount ZTACV / ZTTCV 7 ~ 60 MHz

681 ~ 682

Surface Mount ZTACR / ZTTCR 4 ~ 8 MHz
683 ~ 684 Surface Mount ZTACW / ZTTCW 20 ~ 60 MHz
610 ~ 613 Thru Hole ZTA 1.79 ~ 60 MHz
620 ~ 623 Thru Hole ZTT 1.79 ~ 60 MHz

630 ~ 636

Thru Hole ZTB 190 ~ 1250 KHz

637

Thru Hole IC Applicable 456 ~ 912KHz

638

Surface Mount ZTB 375 ~ 1250 KHz
640 Thru Hole TO-39 290 ~ 980 MHz
641 Thru Hole F-11 384 ~ 434 MHz
642 Thru Hole   TO-39 314 ~ 980 MHz
643 Thru Hole   F-11 418 ~ 434 MHz
650 Thru Hole   ZTU 450 ~ 480 KHz
660 ~ 661 Thru Hole   For TV 4.5 ~ 6.8 MHz
662 ~ 663 Thru Hole   for Radio 10.7 MHz
664 Thru Hole   for Com. 455 KHz
665 Surface Mount for Com. 455 KHz
685 Surface Mount ZTTCE 8 ~ 12 MHz
Ceramic Resonator Products

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