HMC821LP6CETR

Clock Generators, PLLs, Frequency Synthesizers Overview

The HMC821LP6CETR is a Fractional-N Phase-Locked Loop (PLL) with an integrated Voltage Controlled Oscillator (VCO), manufactured by Analog Devices Inc. It operates across three RF bands: 860–1040 MHz, 1720–2080 MHz, and 3440–4160 MHz. The device features ultra-low phase noise of -106 dBc/Hz typical and a Figure of Merit (FOM) of -227 dBc/Hz. It utilizes a 24-bit step size with a resolution of 3 Hz and less than 180 fs RMS jitter. The component is housed in a 40-lead, 6x6 mm SMT package.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Tri-band RF bandwidth covering 860–1040 MHz, 1720–2080 MHz, and 3440–4160 MHz
• Ultra-low phase noise (-106 dBc/Hz typical) and Figure of Merit (-227 dBc/Hz)
• 24-bit fractional divider providing 3 Hz typical resolution
• Cycle slip prevention technology for fast frequency hopping

Clock Generators, PLLs, Frequency Synthesizers Applications

• Cellular/4G Infrastructure
• Repeaters and Femtocells
• Communications Test Equipment
• CATV Equipment
• Phased Array Applications

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the EOL status and supply availability through authorized distributors or Analog Devices directly. Confirm that the 'ETR' suffix corresponds to the reel packaging format specified in the official documentation. Ensure compliance with RoHS requirements as indicated in the datasheet before procurement.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this component for applications requiring wide tri-band coverage and low phase noise. Ensure the design supports the required power supply voltages: 3.3V for analog/digital supplies and 5V for charge pump/VCO core supplies. Verify that the PCB layout accommodates the 40-lead QFN package and provides adequate thermal dissipation via the ground paddle.

Clock Generators, PLLs, Frequency Synthesizers Part Context

The HMC821LP6CETR belongs to the HMC821 series of PLLs with integrated VCOs from Analog Devices. It is designed for high-performance synthesizer applications where low spurious products and fast settling times are critical. The device integrates a delta-sigma modulator for fine frequency steps.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Check for direct pin-compatible replacements within the HMC821 family or other Analog Devices tri-band PLLs. Verify electrical parameter compatibility, specifically phase noise and output power levels, when considering alternative part numbers.

Clock Generators, PLLs, Frequency Synthesizers FAQ

What are the supported RF output frequencies?

The HMC821LP6CETR supports three bands: 860–1040 MHz (fo/2), 1720–2080 MHz (fo), and 3440–4160 MHz (2fo).

What is the typical phase noise performance?

The device achieves ultra-low phase noise of -106 dBc/Hz typical within the band.

How does the device handle frequency hopping?

It uses cycle slip prevention (CSP) technology in the phase detector to enable faster frequency hopping times.