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“Issues” faced by OCXO, the currently mainstream “crystal oscillator”
OCXO (oven-controlled oscillator) is a clock with particularly excellent frequency deviation/accuracy among oscillators.
There are needs in markets that require high functionality and quality, such as communication infrastructure, broadcasting equipment, measuring equipment, medical equipment, and wireless.
As the system clock requires the highest accuracy, it is also more difficult to design and requires more man-hours.
From the perspective of such resources, ``OCXOs are based on crystal oscillators, which have been mainstream for a long time.
We often hear from our customers that we often mount products that are registered in-house on boards as is.
Due to these circumstances, the crystal oscillator OCXO, which is currently widely used, has the following issues.
The reality is that this is causing headaches in many design settings.
① Huge cost
② You have to compromise on performance and characteristics (example below)
- Frequency temperature characteristics
- Holdover performance
- Aging characteristics
③The size is large. With the increase in functionality, the number of other mounted components has increased, reaching an unacceptable level.
④There is an upper limit to the number of on/off times
Why SiTime is recommended for new OCXO consideration
The problems faced by crystal oscillators listed above can be resolved by replacing them with SiTime's "OCXO" or "high-precision TCXO" products.
*Please note that "replacement" here does not mean replacing it with a pin-compatible component on the same board.
There is a high possibility that you will need to change the board due to the layout change, so we recommend that you consider this at the time of new design.
We have summarized four recommended points for SiTime 's new OCXO series"Epoch Platform SiT5801" below.
Recommended reason 1: Excellent frequency stability
It boasts excellent frequency-temperature characteristics (dF/dT) against ambient temperature changes as shown below.
Recommended reason 2: Resistance to aging
The spec is ±0.08 ppb/day, which is about 1/3 of the typical crystal-based OCXO ratio.
Recommended reason 3: Small size
The size of SiT5801 is 9mm x 7mm x 3.73mm.
[OCXO ratio of general crystal oscillators] The footprint is 1/9 and the height is about 1/3.
Recommended reason 4: Excellent environmental resistance performance
Needless to say, MEMS oscillators' unique temperature characteristics, shock resistance, and vibration resistance are also attractive features.
Communication infrastructure and base stations are examples of products in which OCXOs are used, but they must also be resistant not only to changes in outside temperature but also to all kinds of vibrations and shocks.
[Reference information]
-Click here for details on SiTime's new OCXO series "Epoch Platform SiT5801" product.
-FAQ when considering OCXO (Frequently Asked Questions) Jump to Cytime manufacturer's site
-What are the advantages of MEMS oscillators compared to crystal oscillators?
There is also an option to replace OCXO with TCXO
SiTime's high-precision TCXO already has a lineup of products that meet the specifications of some crystal oscillator OCXOs.
As long as the specifications are met, it is possible to create a simpler design.
In fact, some customers said, ``I don't need the precision of an OCXO, but the old circuit diagrams had a big crystal oscillator...''
There is also a YouTube video that clearly explains the comparison of characteristics between “SiTime's MEMS oscillator” TCXO and “crystal oscillator” TCXO. Please take a look.
(You can see the results of various tests such as temperature characteristics, vibration and shock resistance, power supply noise resistance, etc. of both products mounted on the same board)
▶ Watch the comparison test video
At the end
I hope this article is of some help. If you have any questions when designing an OCXO, please feel free to contact us.