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 Oscillator Type Output Frequency Frequency Stability Load Capacitance Package Type Output Level Minimum Operating Temperature Maximum Operating Temperature Height Dimensions
RS Stock No. 729-3329
Mfr. Part No.OCXOV-AV5-10.000
MYR676.37
Each
units
OCXO 10MHz ±0.2ppm - PDIP HCMOS 0°C 60°C 7.8mm 20.14 x 12.52 x 7.8mm
RS Stock No. 894-9809
Mfr. Part No.LFOCXO063815Bulk
BrandIQD
MYR776.67
Each
units
OCXO 10MHz ±1ppb 15pF 36x27mm DIP Sinewave -40°C 85°C 13mm 36.2 x 27.2 x 13mm
New
RS Stock No. 205-5873
Mfr. Part No.SGTM20-3V3-B-H6
BrandSYRLINKS
MYR2,676.04
Each
units
OXCO 20MHz ±70ppb 15pF Encapsulated DIL14 HCMOS - - - -
New
RS Stock No. 205-5874
Mfr. Part No.EWOS10HP-5V0-B-S4
BrandSYRLINKS
MYR3,033.64
Each
units
OXCO 10MHz ±10ppb 15pF Europack High Sine - - - -
New
RS Stock No. 205-5869
Mfr. Part No.EWOS20-5V0-B-C1
BrandSYRLINKS
MYR1,823.76
Each (In a Box of 2)
units
OXCO 20MHz ±70ppb 10pF DIL14 Low Clipped Sinewave - - - -
New
RS Stock No. 205-5870
Mfr. Part No.EWOS40-5V0-B-C1
BrandSYRLINKS
MYR1,862.50
Each (In a Box of 2)
units
OXCO 40MHz ±70ppb 10pF DIL14 Low Clipped Sinewave - - - -
New
RS Stock No. 205-5876
Mfr. Part No.SGTM10HP-5V0-B-S5
BrandSYRLINKS
MYR3,874.00
Each
units
OXCO 10MHz ±10ppb 15pF Encapsulated Europack Sine - - - -
New
RS Stock No. 205-5875
Mfr. Part No.EWOS831-5V0-B-S4
BrandSYRLINKS
MYR3,051.52
Each
units
OXCO 10MHz ±10ppb 15pF Europack High Sine - - - -
RS Stock No. 894-9782
Mfr. Part No.LFOCXO063800Bulk
BrandIQD
MYR335.98
Each
units
OCXO 10MHz ±20ppb 15pF SMD HCMOS -40°C 85°C 6.5mm 14.4 x 9.5 x 6.5mm
RS Stock No. 894-9798
Mfr. Part No.LFOCXO063802Bulk
BrandIQD
MYR335.98
Each
units
OCXO 19.2MHz 0.001ppm 15pF SMD HCMOS -40°C 85°C 6.5mm 14.4 x 9.5 x 6.5mm
New
RS Stock No. 205-5868
Mfr. Part No.EWOS10-5V0-B-C1
BrandSYRLINKS
MYR1,713.50
Each (In a Box of 2)
units
OXCO 10MHz ±70ppb 10pF DIL14 Low Clipped Sinewave - - - -
New
RS Stock No. 205-5871
Mfr. Part No.SGTM10-3V3-B-H6
BrandSYRLINKS
MYR2,676.04
Each
units
OXCO 10MHz ±70ppb 15pF Encapsulated DIL14 HCMOS - - - -
RS Stock No. 894-9802
Mfr. Part No.LFOCXO063804Bulk
BrandIQD
MYR335.98
Each
units
OCXO 38.88MHz ±20ppb 15pF SMD HCMOS -40°C 85°C 6.5mm 14.4 x 9.5 x 6.5mm
RS Stock No. 693-6744
Mfr. Part No.MOFH5200C-10.000
BrandMMD
MYR978.00
Each
units
OCXO 10MHz ±200ppb 15pF PDIP HCMOS -20°C 70°C 13.1mm 20.7 x 10.8 x 13.1mm