SIT9005ACA2G-XXEN

Programmable oscillators often play a crucial role in various electronic systems and can generally be divided into three types including XO (Crystal Oscillators), VCXO (Voltage Controlled Crystal Oscillators) and PLL (Phase-Locked Loops). The SIT9005ACA2G-XXEN is an example of the VCXO type, and can be used to provide signal sources for systems relying on high frequency and stable output signals from a frequency generator.

A VCXO consists of an AT-cut crystal with additional components for permanent storage, such as an EEPROM for programming, as well as voltage-tuning or modulation functions. In a typical application, the SIT9005ACA2G-XXEN takes an external signal as a reference and produces a stable output frequency. This frequency can be programmed, or adjusted in small increments using voltage control, over a limited range.

The SIT9005ACA2G-XXEN is an ideal choice for a number of applications including consumer electronics, communications systems, test and measurement, automotive, and other applications with precise timing requirements. It provides the stability and accuracy of an AT-cut quartz crystal and the precise tuning of a voltage-controlled crystal oscillator (VCXO).

The SIT9005ACA2G-XXEN contains an integrated AT-cut quartz crystal resonator and voltage-controlled die. It features high accuracy, low phase jitter, extremely low noise and temperature stability, and can be programmed to generate frequencies from 10 to 54 MHz.

The working principle of a VCXO is based on the fact that the frequency of a quartz crystal oscillator can be changed by applying an external voltage. When a voltage is applied, the Resonator\'s internal capacitance changes, thus impacting its frequency of oscillation. This voltage-controlled frequency adjustment is known as dynamic frequency tuning. The SIT9005ACA2G-XXEN uses this function to generate a precise output frequency.

In order to ensure precise tuning of the PLL circuit, the SIT9005ACA2G-XXEN contains two EEPROMs with a total of 32-bit in storage for programming parameters. The EEPROMs store voltage and DC bias settings (impedance, crystal parameters, load capacitors and load compensation) that can be adjusted to achieve tuning limits up to ±10ppm. The EEPROMs can also be programmed with output power mode, output frequency range and any special performance parameters or customization needed for specific applications.

In addition to its excellent dynamic frequency tuning performance, the SIT9005ACA2G-XXEN also has a built-in voltage regulator that allows for higher current draw. This VCXO also has a low phase noise output, making it suitable for use in communication applications such as 4G/LTE and 5G. It is also designed to operate in a wide temperature range, making it ideal for use in critical applications, such as in the aerospace and defense industries.

Overall, the SIT9005ACA2G-XXEN is an advanced voltage-controlled crystal oscillator with excellent noise and stability performance, making it ideal for a wide range of applications that require precise and stable frequency sources. Its advanced EEPROM configuration options, voltage regulator, and dynamic frequency tuning capabilities make it an attractive solution for many designs.