SIT9005ACR2H-XXEM

Programmable Oscillators are oscillators which allow users to change the frequency of oscillatory systems in response to changing conditions. The SIT9005ACR2H-XXEM is an important part of this family. It is a programmable oscillator which consists of a frequency synthesizer, clock generator, and digital phase-lock loop (DPLL) integrated circuit (IC) designed in a QFN or MLF type package.

The main purpose of the SIT9005ACR2H-XXEM is to detect a reference frequency and lock the output to that frequency. The chip also supports a full range of frequency ranges and programmability. This is useful in many applications, such as cellular modem calibration, frequency synthesis, digital control, frequency hopping and security systems.

The SIT9005ACR2H-XXEM is typically used in base stations and other comunication systems. The key features of the it include fast start up speed, low supply current, wide temperature range and wide frequency range. It is able to maintain very tight frequency control and also constrain power and current consumption. This makes it suitable for use in embedded and low-power applications.

The SIT9005ACR2H-XXEM contains two dedicated logic sections, namely a frequency synthesizer and a clock generator. The frequency synthesizer is responsible for controlling the oscillator frequency. The clock generator generates the required output frequency. The two sections are coupled with an analog digital phase-lock loop (DPLL). The DPLL allows the oscillator to track and lock the frequency by varying a feedback loop.

The DPLL structure consists of two components, the voltage controlled oscillator (VCO) and the phase frequency detector (PFD). The PFD checks the phase difference between the reference frequency and the VCO frequency. This value is then compared to the feedback loop and the VCO output frequency is adjusted accordingly. Once the unstable frequency lock is achieved, the PFD, VCO and loop filter are enabled to adjust the feedback loop and lock the output frequency to the reference.

Overall, the SIT9005ACR2H-XXEM is an important part of the programmable oscillator family. It offers fast lock response, low power consumption and wide frequency range, making it suitable for many applications, especially in base stations, communication systems and embedded devices. With its digital phase-lock loop, the SIT9005ACR2H-XXEM can track and lock in a frequency quickly, ensuring accuracy and stability.