OCXO Oscillators

OCXO stands for Oven Controlled Crystal Oscillator. These oscillators offer higher stability than standard Clock Oscillators or TCXO’s over temperature variations. They can also offer better overall accuracy over the short term (typically 1x10−12 over a few seconds) and longer-term (typically 1x10−8 (10 ppb) per year).

OCXO’s are precision oscillators that can provide a stable oscillation over variations in ambient temperature. OCXO temperature stability can range from the most basic at 500ppb to sophisticated double ovens at 0.02ppb, with most falling between 50ppb and 3ppb.

OCXO’s work through the tight control of their internal oven that keeps the chamber and the crystal at a set temperature, so holding the frequency stable. The temperature selected for the oven is one at which the slope of the crystal's frequency vs. temperature curve is near zero. This is called the &147turn point&148 of the crystal and is normally 75°C to 80°C for commercial OCXO’s. For industrial grade OCXO’s where the maximum temperature can vary up to 85°C, the turn point will be higher still. The important design consideration is that the turn point/oven temperature must be higher than the operating temperature, so frequency control is maintained.

Output logic options for these oscillators consist of HCMOS, Clipped Sine-wave, and Sine-wave configurations


Type of Crystal used


OCXO’s generally use AT-cut or SC-cut (Stress-Compensated) crystals in their design, with the SC-cut being used for higher performance. The SC-cut crystal offer flatter frequency vs. temperature curve reduces warmup time, and has other good attributes, like better ageing, higher Q resulting in better phase noise, less G-sensitivity, and less sensitive to vibration.

Applications:


  • Broadcasting
  • Satellite Systems
  • Telecommunications
  • Data communications
  • Test and measurement

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Description Price Output Frequency Frequency Stability Load Capacitance Package Type Output Level Minimum Operating Temperature Maximum Operating Temperature Height Dimensions Oscillator Type
RS Stock No. 729-3329
Mfr. Part No.OCXOV-AV5-10.000
£139.33
Each
Units
10 MHz ±0.2ppm - PDIP HCMOS 0 °C +60 °C 7.8mm 20.14 x 12.52 x 7.8mm OCXO
RS Stock No. 894-9809
Mfr. Part No.LFOCXO063815Bulk
BrandIQD
£134.02
Each
Units
10 MHz ±1ppb 15pF 36x27mm DIP Sinewave -40 °C +85 °C 13mm 36.2 x 27.2 x 13mm OCXO
RS Stock No. 894-9798
Mfr. Part No.LFOCXO063802Bulk
BrandIQD
£67.64
Each
Units
19.2 MHz 0.001ppm 15pF SMD HCMOS -40 °C +85 °C 6.5mm 14.4 x 9.5 x 6.5mm OCXO
RS Stock No. 693-6744
Mfr. Part No.MOFH5200C-10.000
BrandMMD
£146.62
Each
Units
10 MHz ±200ppb 15pF PDIP HCMOS -20 °C +70 °C 13.1mm 20.7 x 10.8 x 13.1mm OCXO
RS Stock No. 894-9782
Mfr. Part No.LFOCXO063800Bulk
BrandIQD
£66.39
Each
Units
10 MHz ±20ppb 15pF SMD HCMOS -40 °C +85 °C 6.5mm 14.4 x 9.5 x 6.5mm OCXO
RS Stock No. 693-6740
Mfr. Part No.MOFH5200C-100.000
BrandMMD
£200.14
Each
Units
100 MHz ±200ppb 15pF PDIP HCMOS -20 °C +70 °C 13.1mm 20.7 x 10.8 x 13.1mm OCXO
RS Stock No. 894-9802
Mfr. Part No.LFOCXO063804Bulk
BrandIQD
£67.64
Each
Units
38.88 MHz ±20ppb 15pF SMD HCMOS -40 °C +85 °C 6.5mm 14.4 x 9.5 x 6.5mm OCXO
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