What is the difference between Epson SG-8200CG programmable crystal oscillator and temperature compensated crystal oscillator?

There are several key differences between Epson SG-8200CG programmable crystal oscillator and temperature compensated crystal oscillator (TCXO), as follows:

Functional characteristics

SG-8200CG programmable crystal oscillator: With programmable functions, users can flexibly set the output frequency according to specific application needs in the wide frequency range of 1.2MHz to 170MHz through dedicated programming tools, greatly improving the flexibility and efficiency of design and meeting the diverse frequency requirements of different electronic devices.

Temperature compensated crystal oscillator: Its main feature is the temperature compensation function, which reduces the oscillation frequency change caused by environmental temperature changes through a network composed of additional temperature compensation circuits such as thermistors, varactor diodes, etc., thereby maintaining a relatively stable frequency output over a wide temperature range.

Frequency stability

SG-8200CG programmable crystal oscillator: Within the temperature range of -40 ° C to+125 ° C, the frequency tolerance can reach ± 50 × 10 ⁻⁶, and the typical phase jitter at 125MHz is 1.1ps. It has high frequency accuracy and stability, and can provide accurate clock signals for electronic devices SG-8200CG programmable crystal oscillator, due to its adjustable frequency characteristics, its frequency stability may be affected by other factors such as power supply noise, voltage fluctuations, etc. But it can be optimized and set according to different environments and conditions based on needs. If the frequency requirements of the system vary greatly or need to operate at multiple frequencies, SG-8200CG is a flexible choice.

Temperature compensated crystal oscillator (TCXO): The frequency stability varies depending on its type and accuracy level. The frequency stability of a typical temperature compensated crystal oscillator can reach around ± 0.5ppm to ± 2ppm within the temperature range of -40 ° C to+85 ° C. Although its frequency stability is not as good as that of a constant temperature crystal oscillator, it is superior to ordinary crystal oscillators without temperature compensation Temperature compensated crystal oscillators exhibit excellent stability, especially in environments with significant temperature fluctuations. Due to the temperature compensation mechanism inside TCXO, its frequency stability is usually better than that of standard ordinary crystal oscillators, especially suitable for applications with large temperature changes. For applications that require high-precision clocks, such as GPS systems, communication base stations, etc., the temperature stability of TCXO is an important advantage.

working principle

SG-8200CG programmable crystal oscillator: using advanced MEMS technology, based on the piezoelectric effect of quartz crystal to generate oscillation signals, and then flexibly adjusting the output frequency through internal programmable logic circuit Programmable crystal oscillators allow users to program and set different output frequencies according to their needs through adjustable frequency control circuits. This makes it more flexible and able to adapt to various application needs. Users can adjust the output frequency by configuring external control signals or programming interfaces, and even dynamically adjust the frequency in some cases. This type of crystal oscillator is suitable for scenarios that require frequent frequency adjustment according to system requirements.

Temperature compensated crystal oscillator: using temperature sensors to sense changes in environmental temperature, converting temperature information into electrical signals, and then controlling the parameters of components in the compensation circuit, such as changing the capacitance value of varactor diodes or the resistance value of thermistors, in order to adjust the load capacitance or oscillation circuit parameters of the crystal oscillator to compensate for frequency drift caused by temperature changes The temperature compensated crystal oscillator eliminates the influence of temperature changes on crystal frequency through a built-in temperature compensation circuit. The frequency of the crystal will shift at different temperatures, and the temperature compensated crystal oscillator dynamically adjusts the frequency through an integrated temperature sensor and compensation circuit to maintain the output frequency within a relatively constant range. This enables TCXO to maintain high frequency stability even in environments with significant temperature changes.

Application scenarios

SG-8200CG programmable crystal oscillator: Due to its high flexibility and programmability, SG-8200CG is suitable for scenarios that require adjustable frequency, such as:

Automotive electronics: precise synchronization of multiple sensors is required in the auto drive system, and the SG-8200CG can adjust the frequency of different modules as required.

Communication system: In some communication devices that require different frequency operating modes, SG-8200CG can be flexibly programmed according to actual needs.

Industrial automation: In some control systems that require high-precision synchronization, SG-8200CG can provide accurate clock signals.

Temperature compensated crystal oscillator (TCXO): Due to its superior temperature stability, TCXO is widely used in environments with large temperature fluctuations, especially in applications that require high precision and long-term stability. For example:

GPS system: requires a highly stable clock source to maintain positioning accuracy.

Communication base station: It is necessary to ensure frequency stability to avoid clock drift affecting communication quality.

Aerospace: In harsh temperature environments, it is necessary to ensure that the clock frequency of equipment is not affected by temperature changes.