HMC828LP6CE

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HMC828LP6CE is a limited performance 6-bit Tunable Frequency Synthesizer from Hittite Microwave Corporation. It is designed for applications in cellular and wireless communications systems. The device is a complete integrated Frequency Synthesizer, Phase Locked Loop (PLL) and voltage-controlled oscillator (VCO). It is available in an 8-pin MSOP package.

It can generate synthesized frequencies ranging from 1950 MHz to 5950 MHz (6-bit frequency resolution of 25-50 MHz) and supports a wide range of modulation types, such as CPFSK, GMSK, FSK, QAM and more. The HMC828LP6CE supports internal tuning resolution of 1.6 MHz and features an output phase adjust that allows up to 16 phase steps.

The device has low phase noise of -97dBc/Hz and low phase error of 0.4 deg x 2.4GHz. It is a wideband device with a wide frequency range and high linearity, making it suitable for a variety of communication systems. The chip also features a Serial Port Interface (SPI) that supports a wide range of programming and control functions.

The working principle of the HMC828LP6CE is based on the classic analog Phase Locked Loop (PLL). The input frequency is fed into the loop filter, which is connected to the phase-detector block. The phase detector compares the input frequency with an internally generated frequency and provides an output voltage proportional to the phase difference between two. This voltage is then filtered through the loop filter and fed into the VCO control voltage input, enabling it to adjust the output frequency until the input frequency equals the internally generated frequency.

The output frequency is further modulated with the onboard programmable loop divider, which divides down the VCO output frequency to produce the required output frequency. Additionally, the device features an integrated Voltage Controlled Crystal Oscillator (VCXO) that can be used to support an even wider frequency range and to achieve better accuracy in the output frequency. Finally, the output power amplifier is used to drive the output signal from the device, allowing it to be used in multiple applications.

In conclusion, the HMC828LP6CE is a limited-performance 6-bit tunable frequency synthesizer from Hittite Microwave Corporation. It supports a wide range of modulation types and can generate synthesized frequencies ranging from 1950 MHz to 5950 MHz. The device works on the classic analog Phase Locked Loop (PLL) principle and features an integrated Voltage Controlled Crystal Oscillator (VCXO) and an onboard programmable loop divider. The device is highly versatile and can be used in a variety of communication systems.

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