您可能已经注意到使用石英计时解决方案时最终会出现问题。
这些装置具有起作用的趋势，特别是在高应力条件下。
此外，它们的可靠性并不总是最好的。
一种解决方案，切换到MEMS定时设备。
这些器件没有石英计时装置的困难。
以下是三种迹象表明切换到MEMS定时装置将是有益的。
1.需要更多的稳定性
时间需要的一件事就是稳定性。
借助MEMS定时解决方案，每个级别都具有更好的稳定性。
频率稳定性 - 根据Sitime，他们的MHz和kHz振荡器的稳定性等级比典型的石英振荡器好两倍（±10 ppm），其Elite Super-TCXO可提供±0.05 ppm的稳定性。
例如，SiTime TempFlat™MEMS 32 kHz器件具有
与32 kHz石英晶体谐振器相比，SiTime 32 kHz振荡器频率变化。
（图片来源：SiTime）
没有活动下降或微跳 - SiTime的MEMS振荡器没有出现这些突然的频率偏移，这可能导致系统故障，石英设备容易受到影响
优异的老化 - 由于SiTime MEMS器件采用真空密封，几乎没有滞后现象，并且几乎没有疲劳，因老化造成的劣化要好两倍（超过10年）
Elite Super-TCXO的频率稳定性为±0.1 ppm，完全符合温度规范。
（图片来源：SiTime）
在压力之下，会发生不好的事情
石英的起伏可能很累人。
由于SiTime的MEMS定时产品能够承受高温，快速热梯度，高气流，机械冲击和振动，电源噪声和电磁干扰（EMI），因此可以避免这些起伏。
这是因为它们采用突破性技术构建，可以轻松应对这些问题。
Elite Super-TCXO的频率斜率为±0.1 ppm，温度斜坡最高可达10°C /分钟。
（图片来源：SiTime）
在动态条件下，Elite Super-TCXO具有出色的动态稳定性：
3e-11 ADEV平均时间为10秒
0.1 ppb / g的抗振动能力
0.2 ps / mV电源噪声抑制（PSNR）
3.供应商可靠性
SiTime产品采用强大的6-Sigma方法设计和生产，非常可靠耐用，因为它们的制造工艺结合MEMS设备的小体积和独特设计，先进的模拟技术以及单晶硅的卓越品质使其成为可能。
- 这是半导体行业中最好的。
石英器件的典型故障率为50至150 DPPM。
- 这意味着MTBF超过10亿小时（平均故障间隔时间）。
这比典型的石英产品好30倍。
SiTime以成为可靠的供应合作伙伴而自豪。
他们可以利用大规模半导体行业及其巨大的容量，因为他们的设备是用硅制造的。
与石英不同，SiTime可以轻松扩展，并且没有专门的资本密集型制造供应链。
此外，由于他们的产品基于可编程架构，因此可实现数百万种规格组合。
客户可以在很宽的范围内订购任何频率，任何电源电压和任何稳定性。
MEMS并不复杂
如果石英产品无法提供所需的性能，可靠性或功能，则表明您需要切换。
MEMS振荡器更加稳定，坚固且可靠。
SiTime设计了他们的MEMS定时产品，以解决最困难的定时问题并克服石英的局限性。
一旦你了解MEMS时序，你就永远不会回头。
以上来自于谷歌翻译
以下为原文
You’ve probably noticed that problems eventually arise when using quartz timing solutions. These devices have a tendency to act up, particularly in high stress conditions. Furthermore, their reliability is not always the best.
One solution, switch to MEMS timing devices. These devices don’t have the difficulties the quartz timing devices do. Below are three indications that switching to MEMS timing devices would be beneficial.
1. More stability is required
The one thing you need from timing is stability. With MEMS timing solutions, there is better stability exhibited on every level.
- Frequency stability – According to SiTime, their MHz and kHz oscillators have stability ratings that are two times better (±10 ppm) than typical quartz oscillators with their Elite Super-TCXOs offering stabilities as good as ±0.05 ppm. For example, the SiTime TempFlat™ MEMS 32 kHz devices have <10 ppm at 25°C (room temp) and <75 to 100 ppm over the entire industrial temperature range. Quartz crystals (XTALs), on the other hand, demonstrate a 20 ppm variation at 25°C and -160 to -200 ppm over temp.
![]() SiTime 32 kHz oscillators frequency variation compared to 32 kHz quartz crystal resonators. (Image source: SiTime)
- No activity dips or micro jumps – SiTime’s MEMS oscillators do not exhibit these sudden frequency shifts, which can cause system failure, that quartz devices are susceptible to
- Excellent aging – Because SiTime MEMS devices are vacuum sealed, exhibit virtually no hysteresis, and suffer very little fatigue, their deterioration due to aging is two times better (over 10 years)
![]() The Elite Super-TCXOs frequency stability of ±0.1 ppm is well within spec over temperature. (Image source: SiTime)
2. Under stress, bad things happen
The ups and downs of quartz can be tiring. With the ability of SiTime’s MEMS timing products to withstand high temperatures, rapid thermal gradients, high airflow, mechanical shock and vibration, power supply noise, and electromagnetic interference (EMI), these ups and downs can be avoided. This is because they are built with groundbreaking technology that can easily cope with these problems.
![]() Elite Super-TCXOs exhibit a frequency slope of ±0.1 ppm with up to 10°C/minute temperature ramp. (Image source: SiTime)
Under dynamic conditions, Elite Super-TCXOs feature excellent dynamic stability:
- < 5 ppb/°C frequency slope ΔF/ΔT at 10°C/min ramp
- 3e-11 ADEV at 10 second average time
- 0.1 ppb/g vibration immunity
- 0.2 ps/mV power supply noise rejection (PSNR)
3. Supplier reliability
Designed and produced using robust 6-Sigma methods, SiTime products are very reliable and durable because their manufacturing processes combined with the small mass and unique design of their MEMS devices, advanced analog technology, and the superior quality of single crystal silicon make this possible.
- < 2 DPPM failure rate – this is among the best in the semiconductor industry. Quartz devices that have typical failure rates of 50 to 150 DPPM.
- < 1 FIT rate – which translates to over 1 billion hours MTBF (mean time between failure). This is 30 times better than typical quartz products.
SiTime prides itself in being a dependable supply partner. They can leverage the massive semiconductor industry and its immense capacity because their devices are made with silicon. Unlike quartz, SiTime can easily scale and doesn’t have a specialized and capital-intensive manufacturing supply chain. Plus, since their products are built on a programmable architecture, this enables millions of specification combinations. Customers have the ability to order any frequency, any supply voltage, and any stability within a wide range.
It’s not complicated with MEMS
If quartz products aren’t delivering the performance, reliability or features required, it’s a sure sign that you need to switch. MEMS oscillators are simply more stable, robust, and reliable. SiTime has designed their MEMS timing products to solve the most difficult timing problems and overcome the limitations of quartz. You’ll never go back once you get to know MEMS timing.
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