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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Part Details Brand Output Frequency Frequency Stability Package Type Output Level Minimum Operating Temperature Maximum Operating Temperature Height Dimensions
Micro Crystal 10 MHz Crystal Oscillator, PDIP ±0.2ppm HCMOS Micro Crystal 10 MHz ±0.2ppm PDIP HCMOS 0 °C +60 °C 7.8mm 20.14 x 12.52 x 7.8mm
MMD 10 MHz OCXO, PDIP ±200ppb HCMOS
  • RS Stock No. 693-6744
  • Brand MMD
  • Mfr. Part No. MOFH5200C-10.000
MMD 10 MHz ±200ppb PDIP HCMOS -20 °C +70 °C 13.1mm 20.7 x 10.8 x 13.1mm
MMD 100 MHz OCXO, PDIP ±200ppb HCMOS
  • RS Stock No. 693-6740
  • Brand MMD
  • Mfr. Part No. MOFH5200C-100.000
MMD 100 MHz ±200ppb PDIP HCMOS -20 °C +70 °C 13.1mm 20.7 x 10.8 x 13.1mm
IQD 19.2 MHz Crystal Oscillator, SMD 0.001ppm HCMOS
  • RS Stock No. 894-9798
  • Brand IQD
  • Mfr. Part No. LFOCXO063802Bulk
IQD 19.2 MHz 0.001ppm SMD HCMOS -40 °C +85 °C 6.5mm 14.4 x 9.5 x 6.5mm
IQD 38.88 MHz Crystal Oscillator, SMD ±20ppb HCMOS
  • RS Stock No. 894-9802
  • Brand IQD
  • Mfr. Part No. LFOCXO063804Bulk
IQD 38.88 MHz ±20ppb SMD HCMOS -40 °C +85 °C 6.5mm 14.4 x 9.5 x 6.5mm
IQD 10 MHz Crystal Oscillator, 36x27mm DIP ±1ppb Sinewave
  • RS Stock No. 894-9809
  • Brand IQD
  • Mfr. Part No. LFOCXO063815Bulk
IQD 10 MHz ±1ppb 36x27mm DIP Sinewave -40 °C +85 °C 13mm 36.2 x 27.2 x 13mm
IQD 10 MHz Crystal Oscillator, SMD ±20ppb HCMOS
  • RS Stock No. 894-9782
  • Brand IQD
  • Mfr. Part No. LFOCXO063800Bulk
IQD 10 MHz ±20ppb SMD HCMOS -40 °C +85 °C 6.5mm 14.4 x 9.5 x 6.5mm
IQD 12.8 MHz Crystal Oscillator, SMD ±20ppb HCMOS
  • RS Stock No. 894-9795
  • Brand IQD
  • Mfr. Part No. LFOCXO063801Bulk
IQD 12.8 MHz ±20ppb SMD HCMOS -40 °C +85 °C 6.5mm 14.4 x 9.5 x 6.5mm
IQD 20 MHz Crystal Oscillator, SMD ±20ppb HCMOS
  • RS Stock No. 894-9792
  • Brand IQD
  • Mfr. Part No. LFOCXO063803Bulk
IQD 20 MHz ±20ppb SMD HCMOS -40 °C +85 °C 6.5mm 14.4 x 9.5 x 6.5mm
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