The Error Exchange OCXO (MercuryX E2) is a variant of Rakon’s newly released MercuryX small form factor IC-OCXO. It enhances the existing synchronisation capabilities on a network synchroniser evaluation board by adding frequency error exchange processing and ageing compensation to the system – doubling the holdover performance.

Rakon Head of Product Management, Reza Sedehi, says the Error Exchange OCXO is Rakon’s latest groundbreaking innovation and the first synchronisation solution of its kind.

“Phase synchronisation holdover is essential in 5G DUs, RAN, radios and telecom data centres as it reduces the overall operational cost for mobile carriers,” says Sedehi.

“Traditionally, clocks performing close to 24-hour holdover are bulky, power-hungry and expensive. The Error Exchange OCXO is an elegant solution that will result in smaller, low-power reference clocks for cost-effective system-level synchronisation. Our new solution will be particularly of value for O-RAN equipment vendors who look for turnkey, cost-effective and miniaturised solutions.”

Error Exchange Synchronisation is a technique designed to significantly enhance the capability of OCXO holdover (up to twice the performance) by using a network processor and a synchronisation PLL, typically available in IEEE 1588 implementations.

The PLL and the processor calculate the error between the OCXO frequency and the 1 PPS signal, then feed it back to the OCXO for ageing compensation. The OCXO combines the frequency residual error due to temperature variations and ageing compensated error and feeds it back into the processor for system frequency correction. The E2OCXO concept enables Rakon OCXOs to achieve 8 hours of holdover under real world conditions in a compact 7 x 5 mm package.

The Mercury E2OCXO is in prototyping stage and will be available in a 14x9, a 9x7 and a 7x5mm package. Samples of the 14x9 package will be available mid 2024.

我们的小尺寸OCXO有源晶振基于领先的专有Mercury和Mercury+技术。它们在整个温度范围内具有出色的频率稳定性。MercuryX是Rakon首款采用其专有Mercury ASIC和XMEMS谐振器技术的OCXO，增强了稳定性和保持性能。例如，ROM1490X在-40°C至+95°C温度范围内的频率稳定性为1.5ppb，保持时间为8小时，频率老化为0.2 ppb/天。

这种高度集成的基于ASIC的OCXO设计具有最少的互连数量，从而显著提高了可靠性，并因此降低了设备的总拥有成本（TCO）。
应用程序：Data中心同步基站和小型蜂窝、高级5G、6G无线接入网络（RAN）、网络定时、3E同步（IEEE1588，SyncE）、5G RRHs、光网络和微波传输系统。

Product Name	Package Size (LxWxH)	Nominal Frequency (Fn)	Frequency Stability (FvT)	Temperature Range (°C)
ROM1490X	14.2 x 9.2 x 6.5 mm	10 to 50 MHz	±1.5 ppb	-40 to 95 °C
ROM1490E	14.2 x 9.2 x 6.5 mm	10 to 50 MHz	≤±5 ppb	-40 to 85 °C
ROM1490EA	14.3 x 9.1 x 5.9 mm	10 to 50 MHz	≤±10 ppb	-40 to 95 °C
ROM9070EA	9.7 x 7.5 x 3.9 mm	10 to 50 MHz	≤±10 to 20 ppb	-40 to 95 °C
ROM1490PS	14.2 x 9.2 x 6.5 mm	10 to 50 MHz	≤±10 ppb	-40 to 85 °C
ROM1490PA	14.3 x 9.1 x 5.9 mm	10 to 50 MHz	≤±10 ppb	-40 to 95 °C
ROM9070PA	9.7 x 7.5 x 3.9 mm	10 to 50 MHz	≤±10 to 20 ppb	-40 to 95 °C
ROM7050PA	7.5 x 5.5 x 3.3 mm	10 to 50 MHz	≤±20 ppb	-40 to 105 °C
RFPO55	14.6 x 9.7 x 6.2 mm	10 to 26 MHz	≤±10 ppb	-40 to 85 °C
RFPO50	14.6 x 9.7 x 6.2 mm	10 to 40 MHz	≤±20 ppb	-40 to 85 °C
RFPO45	9.7 x 7.5 x 4.3 mm	10 to 26 MHz	≤±10 ppb	-20 to 70 °C -40 to 85 °C
RFPO40	9.7 x 7.5 x 4.3 mm	10 to 40 MHz	≤±20 to 50 ppb	-40 to 85 °C