HMC822LP6CETR

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The HMC822LP6CETR is a high-performance quartz crystal oscillator that uses a Voltage Controlled Temperature Compensated Crystal Oscillator (VC-TCXO), providing robust performance in the most demanding clock applications. It is capable of providing extremely accurate frequency and phase noise characteristics over a wide range of operating temperatures. The HMC822LP6CETR is designed for use in a variety of applications that require a highly accurate clock source, such as digital television, base station infrastructure, and timing synchronization for mobile devices.

The HMC822LP6CETR utilizes a Variable Frequency Reference (VFR) to achieve extremely low frequency drift over the operating temperature range and to guarantee repeatability. This VFR technology is combined with a Voltage Controlled Crystal Oscillator (VCXO) to provide very low phase and frequency jitter. The HMC822LP6CETR offers superior immunity to supply and load variations, allowing operation at a wide temperature range while maintaining high performance.

The HMC822LP6CETR has a three-state frequency adjustability that enables it to be adjusted to zero, plus or minus frequency, which is ideal for applications that require highly accurate clock generation. The design of the HMC822LP6CETR allows for very low standby current consumption and fast start-up time from a cold start.

The HMC822LP6CETR makes use of a VCO-based Phase-Locked Loop (PLL), which is a frequency synthesis technique used to generate a desired frequency from an available reference frequency. The technique involves locking a voltage-controlled oscillator (VCO) with the reference frequency by using an error detection and compensation circuit. The VCO is then used to generate the desired output frequency by voltage adjustment.

The PLL in the HMC822LP6CETR consists of a frequency detection and control circuit that continuously monitors the reference frequency and compensates for any changes in the reference frequency. The frequency control circuit is used to drive a Voltage Controlled Oscillator (VCO), which produces an output that is proportional to the input voltage. The output of the VCO is then divided down to the desired frequency and used as the system clock. The PLL ensures that the frequency output remains accurate even over changes in supply voltage, temperature and load.

The HMC822LP6CETR also features integrated jitter attenuation capabilities that reduce jitter effects resulting from Phase Locked Loops (PLLs), ensuring a low-noise, clean clock signal for high-performance system designs. Furthermore, the HMC822LP6CETR incorporates carrier/clock frequency separation techniques to improve phase noise performance and reduce subharmonic spurs.

In summary, the HMC822LP6CETR is a high-performance VC-TCXO-based quartz crystal oscillator. It utilizes a Variable Frequency Reference to deliver low frequency drift and a Voltage Controlled Crystal Oscillator to provide low phase and frequency jitter. The integrated PLL ensures very accurate clock generation, even over changes in supply voltage, temperature and load. The HMC822LP6CETR also includes jitter attenuation capabilities and frequency separation techniques for improved performance. It is ideal for use in applications that require accurate clock sources, such as digital TV, base station infrastructure, and mobile device timings.

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