Analog Devices Inc. HMC822LP6CETR

Overview

HMC822LP6CETR from Analog Devices (formerly Hittite Microwave) is a fully integrated Fractional-N Phase-Locked Loop with on-die VCO, serving as a tri-band RF synthesizer for cellular infrastructure and test equipment. It delivers 665–825 MHz, 1330–1650 MHz, and 2660–3300 MHz output bands with ultra-low phase noise (−105 dBc/Hz in-band typ.), <180 fs RMS jitter, and 24-bit frequency resolution (3 Hz typ.). It operates in integer/fractional modes with cycle-slip prevention for fast frequency hopping.

For engineers reviewing the HMC822LP6CETR datasheet, HMC822LP6CETR pinout, HMC822LP6CETR application, or HMC822LP6CETR equivalent, this page provides verified technical context, real-world RF design implications, tri-band VCO tuning behavior, closed-loop phase noise performance at multiple harmonics, and validated alternative synthesizers for 4G/5G infrastructure and high-data-rate radio systems.

Technical Context

The HMC822LP6CETR integrates a low-noise delta-sigma fractional-N PLL, autocalibrating tri-band VCO, precision charge pump (0.02–2.54 mA), and digital self-test logic. Its phase detector supports up to 125 MHz in integer mode and includes cycle-slip prevention for sub-µs frequency settling.

VCO operation spans three distinct RF bands via internal dividers (÷2, ×1, ×2), each with independent output power specs: +9–13 dBm at fVCO/2, +2.5–10.5 dBm at fVCO, and −9–+1 dBm at 2fVCO. Tuning sensitivity is 15 MHz/V at 2 V, with VCO supply pushing ≤ ±1.5 MHz/V.

Key Specifications

Pinout & Package

40-lead, 6 × 6 mm SMT package (36 mm²) with exposed ground paddle; RoHS-compliant low-stress plastic body, matte Sn lead finish, MSL1 rating. Thermal resistance junction-to-paddle = 9 °C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fractional-N PLL with integrated VCO applications.

Compared with HMC822LP6CETR, HMC830LP6CE trades 3 dB higher in-band phase noise for broader frequency coverage and faster PFD rates, while LMS8001 replaces discrete synthesizer function with an integrated transceiver architecture-making it unsuitable for applications requiring dedicated, low-noise LO synthesis.

Availability

HMC822LP6CETR is available at Aetrix Electronics and suitable for cellular infrastructure, communications test equipment, and phased array radar systems requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for HMC822LP6CETR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices acquired Hittite Microwave in 2014 and maintains its high-frequency RF product lines, including integrated PLL/VCO solutions for defense, communications, and instrumentation markets.

The HMC822LP6CETR belongs to Analog Devices' high-performance RF synthesis portfolio, designed specifically for 4G/5G infrastructure and test equipment demanding ultra-low phase noise, multi-band agility, and deterministic frequency switching.

FAQ

What RF output bands does the HMC822LP6CETR support, and how are they generated?

The HMC822LP6CETR supports three RF output bands: 665–825 MHz (fVCO/2), 1330–1650 MHz (fVCO), and 2660–3300 MHz (2fVCO). These are generated internally using a tri-band VCO with integrated ÷2 and ×2 paths-no external components or band-switching circuitry required. Each band has independent output power specs and harmonic suppression characteristics verified per datasheet tables.

How does the HMC822LP6CETR achieve ultra-low phase noise, and what is its Figure of Merit (FOM)?

The HMC822LP6CETR achieves ultra-low phase noise through a low-noise delta-sigma fractional-N PLL architecture, autocalibrating VCO, and precision charge pump. Its FOM is −227 dBc/Hz in fractional mode (measured at 30 kHz offset with 50 MHz PFD), placing it among the highest-performing integrated synthesizers for demanding RF applications like 5G NR and radar.

What is the significance of cycle-slip prevention (CSP) in the HMC822LP6CETR's phase detector?

Cycle-slip prevention (CSP) is a hardware feature in the HMC822LP6CETR's phase detector that actively monitors and corrects for transient misalignment between reference and feedback edges during large frequency jumps. This prevents false lock conditions and enables reliable sub-5 µs frequency reconfiguration-critical for TDD base stations and frequency-hopping military radios.

Can the HMC822LP6CETR operate with a 50 MHz crystal reference, and what impact does reference frequency have on phase noise?

Yes, the HMC822LP6CETR supports 50 MHz crystal references (within 10–200 MHz input range). Per datasheet, synthesizer phase noise degrades by ~5 dB when operating near the low end of the reference range. At 50 MHz, closed-loop phase noise remains excellent: −109 dBc/Hz at 1 kHz offset (fractional mode), making it ideal for stable VCXO-based systems.

What are the critical PCB layout requirements for the HMC822LP6CETR's 6 × 6 mm QFN package?

Key layout requirements include: grounding all NC pins and the exposed paddle directly to a solid RF ground plane using ≥8 thermal vias; maintaining 50 Ω impedance on RF traces; separating analog (AVDD/VCCHF) and digital (DVDD3V) supplies with ferrite beads and local decoupling; and routing VTUNE away from noisy digital lines. The datasheet specifies Rogers 4350 or Arlon 25FR laminate for evaluation boards.