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Q-Tech使用多路输出QT6254LWD9M-125.00MHz太空时钟的好处

来源：http://www.yijindz.com 作者：亿金电子 2024年03月11

Q-Tech使用多路输出QT6254LWD9M-125.00MHz太空时钟的好处

使用多路输出低噪声时钟为航天原始设备制造商提供了三大优势：

1，节省电路板空间。首先，它们在终端设备设计中节省了PC板空间。只需要一个封装，而不是使用多达12个独立的石英晶体振荡器。这对于努力减小卫星电子设备的尺寸具有重要意义。这也节省了OEM的工程时间，因为不再需要仔细设计和协调不同时钟振荡器的输出，这项工作已经在多输出时钟内部完成。

2，高性能。其次，为空间应用定制的多个输出时钟可以在重要方面提供卓越的性能。对于Q-Tech单元，输出之间的偏斜保证小于0.4纳秒，积分相位抖动（12kHz至20MHz）小于1PS，所有失调下的低相位噪声都非常出色。

3，节约成本。第三，通过节省采购（多达）12个独立时钟振荡器的费用，总体成本得以降低。

空间应用中使用的多输出时钟必须符合与单输出空间合格设备相同的规格。Q-Tech生产高达200MHz的多差分输出LVDS全空间时钟，以及高达125MHz的CMOS全空间多输出时钟。QT625 LVDS差分晶振系列从一个扁平封装提供两个多达12个同步输出，CMOS版本最多四个输出。通过利用一个超精密、密封的石英晶体谐振器提供所有输出，在设计和制造谐振器以实现卓越性能方面不遗余力。

这个创新的设备系列已经生产了四年多，并且已经建立了一个令人印象深刻的遗产项目列表。这些单元保证达到100k（国际标准）TID，并且不会闩锁和干扰。它们是MIL-PRF-55310规定的1型2类混合动力车，它们符合MIL-PRF-38534K级要求。在-55C至+125C温度范围内，它们可以保证高达50PPM的温度。有源晶振，这些多路输出时钟提供的整体性能和可靠性至少与Q-Tech数十年来业界领先的太空时钟振荡器一样高。

多输出LVDS系列，3.3Vdc，1到12个差分LVDS对，空间限定晶体振荡器，15MHz至200MHz
Q-Tech进口晶振生产的QT625LW和QT697LW系列空间合格、100kRad（Si）容限混合振荡器是符合MIL-PRF-55310标准的2类混合型多输出LVDS，密封在20引脚扁平封装中。625”SQR或1.25”x 1.65”62引脚定制扁平封装中，在整个军用-55°C至+125°C温度范围内以3.3Vdc运行。该产品结合了良好的抗冲击和振动性能以及卓越的低相位噪声。

产品特征：

•美国制造

•密封包装

•电源电压3.3Vdc

•宽温度范围-55°C至+125°C

•MIL-PRF-38534 K级筛选和质量一致性检查（修改）

•LVDS差分输出

•100k（Si）辐射耐受性

•低相位噪声和抖动

应用程序：•卫星，•航空航天，•FPGA主时钟

Q-Tech使用多路输出QT6254LWD9M-125.00MHz太空时钟的好处

The Benefits of Using Multiple-Output Space Clocks

The use of multiple-output low-noise clocks provides three major advantages to space OEMs.

1，Board Space Savings. First, they save PC board space in the end equipment design. Instead of using up to 12 separate crystal oscillators, only one package is needed. This is of major significance in efforts to reduce the size of satellite electronic equipment. This also saves engineering time at the OEM because it is no longer necessary to carefully design and coordinate the outputs of different clock oscillators, with that work being done internally already in the multiple output clock.

2，High Performance. Second, multiple output clocks tailored for space applications can deliver superior performance in important ways. For Q-Tech units, skew between outputs is guaranteed to be less than 0.4 nanoseconds, integrated phase jitter (from 12 kHz to 20 MHz) is less than one ps, and low-phase noise at all offsets is superb.

3，Cost Savings. Third, by saving the expense of procuring (up to) 12 separate clock oscillators, overall cost is reduced.

Multiple-output clocks used in a space application must meet the same specs as single-output space-qualified devices. Q-Tech produces multiple differential output LVDS full-space clocks at up to 200 MHz, and also CMOS full-space multiple output clocks at up to 125 MHz, in frequency. The QT625 LVDS series offers two up to 12 synchronous outputs from one flatpack package, and the CMOS version up to four outputs. By providing all outputs through the utilization of one ultra-precision, hermetically sealed quartz crystal resonator, no expense is spared in designing and making the resonator achieve superior performance.

This innovative family of devices has been in production for more than four years and has already built up an impressive list of heritage programs. These units are guaranteed to 100k(Si) TID and are latch-up and upset-free. They are Type 1, Class 2 hybrids per MIL-PRF-55310and they meet MIL-PRF-38534 Class K requirements. They can guarantee up to ±50 PPM from -55C to +125C. These multiple-output clocks provide overall performance and reliability that is at least as high as Q-Tech’s decades-long, industry-leading space clock oscillators.

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