8N4DV85EC-0020CDI

Due to market price fluctuations, if you need to purchase or consult the price. You can contact us or emial to us:   sales@allicdata.com

Constructive for dual-voltage, high frequency clocks and oscillators, 8N4DV85EC-0020CDI (hereafter referred as 8N4DV85EC) is an advanced, versatile and robust frequency control device. Designed to provide exceptionally low jitter clock signals and an operating temperature range of -40°C to +85°C, the 8N4DV85EC has seen increased demand in mission critical applications that require precise timing. In this paper, the application of and the working principle behind 8N4DV85EC are discussed.

Applications

Widely used as a clock generator, 8N4DV85EC operates up to 800MHz, providing precision oscillations and exceptional low jitter signals due to its robust temperature compensated VCXO technology and patented operating architecture. The 8N4DV85EC can eliminate system noise and improve reliability in applications such as:

• Wireless infrastructure.
• Networking.
• Memory buffering.
• Industrial automation.
• Medical instruments.
• Test and measurement.

For instance, embedded applications such as imaging systems and medical equipment need high performance oscillators to reduce noise, improve signal strength and stability, and increase reliability of the entire system. In other wireless and embedded applications, 8N4DV85EC supplies reliable high frequency clocks for base stations, repeaters, and routers.

Working Principle

At the core of 8N4DV85EC is a temperature compensated voltage-controlled crystal oscillator (VCXO) housed in a 10 pin ceramic surface mount. The VCXO includes an 8 pin VCXO Analog Die that is integrated with a 2 pin 25 MHz crystal and a HCMOS frequency divider, which are all mounted on the same surface. The 8N4DV85EC uses a proprietary control loop architecture to ensure low jitter operation at frequencies between 1 and 800MHz. This produces a highly reliable signal with superior signal-to-noise ratio.

In the control loop architecture, the crystal and divider are thermostatically compensated by a temperature sensor which provides voltage to correct for frequency drift caused by temperature changes. The temperature compensation is applied by using the resistive temperature sensor to adjust the frequency of the VCXO through a proportional-integral-derivative (PID) control loop. In this loop, the sensor is connected to a controller that presets the resistance, which in turn produces a voltage to adjust the operation frequency of the VCXO. The loop compensates for any temperature related frequency drift of the oscillator. Additionally, the loop also maintains the phase accuracy and noise immunity of the 8N4DV85EC.

The 8N4DV85EC is also fitted with onboard programmable frequency dividers for higher frequency applications, which allows for the system to select the desired output frequency by selecting a frequency divider as well as selecting between two different loop bandwidth selections. The output frequency is determined by the following equation:

Frequency = 25MHz * Feedback_divider * VCO_divider

In addition to that, 8N4DV85EC can be programmed with digital input pins to adjust the output frequency and duty cycle. As digital signals are used, there is no need to adjust an external voltage control to adjust the frequency sweep. This means that it is possible to tailor a duty cycle to a very wide range of frequencies. An external voltage reference is available for additional control, but it is not required for basic frequency adjustments.

Finally, the 8N4DV85EC features an exceptionally low phase noise in the frequency range from 1 to 800 MHz, ensuring superior signal to noise performance and a better immunity to interference and data jitter. This helps in the reduction of the power consumption of the device, as well as improved system performance.

Conclusion

The 8N4DV85EC is an advanced frequency control device designed to provide exceptional performance, low jitter signals and superior signal to noise ratio. The combination of low phase noise and robust temperature compensated VCXO technology provides a reliable and versatile frequency control solution, which is suitable for mission critical and embedded applications. The 8N4DV85EC can be used in a variety of applications, such as wireless infrastructure, networking, memory buffering, industrial automation, medical instruments and test and measurement, due to its superior signal and noise performance.

The specific data is subject to PDF, and the above content is for reference