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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Omschrijving Prijs Output Frequency Frequency Stability Load Capacitance Package Type Output Level Minimum Operating Temperature Maximum Operating Temperature Height Dimensions Oscillator Type
RS-stocknr. 894-9795
FabrikantnummerLFOCXO063801Bulk
FabrikantIQD
€ 75,02
Each
Aantal stuks
12.8 MHz ±20ppb 15pF SMD HCMOS -40 °C +85 °C 6.5mm 14.4 x 9.5 x 6.5mm OCXO
RS-stocknr. 693-6740
FabrikantnummerMOFH5200C-100.000
FabrikantMMD
€ 186,36
Each
Aantal stuks
100 MHz ±200ppb 15pF PDIP HCMOS -20 °C +70 °C 13.1mm 20.7 x 10.8 x 13.1mm OCXO
RS-stocknr. 894-9802
FabrikantnummerLFOCXO063804Bulk
FabrikantIQD
€ 75,02
Each
Aantal stuks
38.88 MHz ±20ppb 15pF SMD HCMOS -40 °C +85 °C 6.5mm 14.4 x 9.5 x 6.5mm OCXO
RS-stocknr. 729-3329
FabrikantnummerOCXOV-AV5-10.000
FabrikantMicro Crystal
€ 179,28
Each
Aantal stuks
10 MHz ±0.2ppm - PDIP HCMOS 0 °C +60 °C 7.8mm 20.14 x 12.52 x 7.8mm OCXO
RS-stocknr. 693-6744
FabrikantnummerMOFH5200C-10.000
FabrikantMMD
€ 177,33
Each
Aantal stuks
10 MHz ±200ppb 15pF PDIP HCMOS -20 °C +70 °C 13.1mm 20.7 x 10.8 x 13.1mm OCXO
RS-stocknr. 894-9782
FabrikantnummerLFOCXO063800Bulk
FabrikantIQD
€ 75,02
Each
Aantal stuks
10 MHz ±20ppb 15pF SMD HCMOS -40 °C +85 °C 6.5mm 14.4 x 9.5 x 6.5mm OCXO
RS-stocknr. 894-9792
FabrikantnummerLFOCXO063803Bulk
FabrikantIQD
€ 75,02
Each
Aantal stuks
20 MHz ±20ppb 15pF SMD HCMOS -40 °C +85 °C 6.5mm 14.4 x 9.5 x 6.5mm OCXO
RS-stocknr. 894-9798
FabrikantnummerLFOCXO063802Bulk
FabrikantIQD
€ 75,02
Each
Aantal stuks
19.2 MHz 0.001ppm 15pF SMD HCMOS -40 °C +85 °C 6.5mm 14.4 x 9.5 x 6.5mm OCXO
RS-stocknr. 894-9809
FabrikantnummerLFOCXO063815Bulk
FabrikantIQD
€ 173,41
Each
Aantal stuks
10 MHz ±1ppb 15pF 36x27mm DIP Sinewave -40 °C +85 °C 13mm 36.2 x 27.2 x 13mm OCXO
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