Epson fs femtosecond crystal oscillator selection data

    Epson is a heavyweight enterprise in the field of crystal oscillators, and its complete product line is very rare, especially in terms of small size, low power consumption, high precision, and high stability crystal oscillators. In the field of ultra-low jitter femtosecond crystal oscillators, Epson can provide three types of packaged 50fs crystal oscillators at 156.25 MHz, 3225~7050. Epson femtosecond crystal oscillator achieves extremely low phase noise and jitter performance through precise control of the quartz crystal cutting method and differential multi output circuit design. Therefore, the delivery mainly consists of six pins. As shown in the following figure：

What is femtosecond (fs) crystal oscillator

A crystal oscillator with extremely low phase noise and jitter characteristics, whose phase jitter value can be reduced to the femtosecond (fs) level, which is less than 1 picosecond (1000 femtoseconds). This type of crystal oscillator can provide high-quality clock signals with low jitter and low phase noise, which is particularly important for applications that require extremely high time accuracy and stability.

working principle

The Femtosecond Crystal Oscillator uses a special material - the femtosecond crystal, which is a very stable crystal material that can respond to external excitation in a very short time (femtosecond), thereby generating extremely accurate frequency signals. The stability of its oscillation frequency has reached an unprecedented level.

Characteristics of Epson femtosecond crystal oscillator

Mainly manifested in the following aspects:

Extremely high stability: Due to its working principle based on femtosecond crystals, the output frequency of Epson femtosecond crystal oscillators has extremely high stability, which is crucial for applications that require high-precision time.

Extremely low phase noise: It has extremely low phase noise characteristics, which means that the frequency signal it generates has very little time jitter, ensuring high accuracy in data transmission and processing. Small size and low power consumption: Compared with traditional crystal oscillators, Epson femtosecond crystal oscillators have smaller size and lower power consumption, which makes them widely applicable in portable and small devices. High reliability: As one of the world's leading crystal oscillator manufacturers, Epson's products have undergone strict quality control and testing, demonstrating excellent reliability and durability.

application area 

Mainly used in fields that require extremely high time accuracy and stability, such as high-end audio equipment, precision measuring instruments, high-speed communication systems, etc. In these applications, stable and low-noise clock signals can be provided to ensure the accuracy and reliability of the system.

Advantages and disadvantages

Advantages: It can provide extremely low phase noise and jitter, which is crucial for applications that require high-precision time synchronization. For example, in audio devices, low jitter can reduce the distortion of sound signals and improve sound quality

Disadvantages: The cost is relatively high, and Epson's current low jitter programmable crystal oscillators are still at the PS level, which cannot completely replace fixed frequency femtosecond crystal oscillators. Therefore, for some infrequently used frequencies, it may face difficulties in sample delivery. In addition, for most consumer applications, ordinary crystal oscillators are sufficient to meet the demand, so in some scenarios, high performance may not be necessary in certain situations, depending on the specific needs of the designer. Femtosecond crystal oscillators provide strong support for applications that require extremely high time accuracy and stability due to their extremely low phase noise and jitter characteristics. Despite its high cost, the performance advantages of femtosecond crystal oscillators are irreplaceable in high-end audio, precision measurement, and high-speed communication fields.

Specifications:

At present, the three types of packaging in mass production are 3225, 5032, and 7050.

Output waveform

The series name of LVDS output is VEN, such as SG3225VEN/SG5032VEN/SG7050VEN, where V means LVDS.

LV-PECL output: such as SG3225EEN/SG5032EEN/SG7050EEN, where the seventh letter E of the positive number means LV-PECL

Recommended standard frequency

Epson femtosecond crystal oscillators can provide any frequency in the range of 25MHz to 500MHz, but considering production and price costs, EPSON recommends engineers to choose the standard frequency recommended by Epson as much as possible when selecting the first crystal oscillator for circuit design. Due to the large number of orders received by the factory, the delivery time will be shorter and the price will be correspondingly reduced. Here, Epson femtosecond crystal oscillators recommend the following commonly used frequencies: 100MHz, 125MHz, 156.25MHz, 200MHz, 312.5MHz, 491.52MHz.

Phase jitter

Phase jitter and phase noise are different manifestations of the same phenomenon, describing the instability of signals in the time domain and frequency domain, respectively. We usually use phase jitter to measure the magnitude of phase noise, as shown in the table below.

Power supply voltage:

D: 2.5 V ± 0.125 V；

C: 3.3 V ± 0.165 V.

Model recommendation: