Analog Devices Inc. HMC839LP6CE

Overview

HMC839LP6CE from Analog Devices (formerly Hittite Microwave) is a fully functional Fractional-N Phase-Locked Loop with integrated Voltage-Controlled Oscillator (VCO), operating across three RF bands: 1050–1205 MHz, 2100–2410 MHz, and 4200–4820 MHz. It delivers ultra-low phase noise (−112 dBc/Hz typ. in-band), <180 fs RMS jitter, and 24-bit frequency resolution (3 Hz typ.), serving as a high-performance synthesizer for cellular infrastructure and test equipment.

For engineers reviewing the HMC839LP6CE datasheet, HMC839LP6CE pinout, HMC839LP6CE application, or HMC839LP6CE equivalent, this device supports exact-frequency resolution mode, built-in digital self-test, tri-band VCO output (fo/2, fo, 2fo), and cycle-slip prevention for fast frequency hopping in 4G repeaters and phased array systems.

Technical Context

The HMC839LP6CE integrates a low-noise tri-band VCO with autocalibration, a precision charge pump, low-noise reference path divider, and fractional-N delta-sigma modulator enabling fine step sizes and low spurs. Its phase detector includes cycle-slip prevention (CSP) to reduce frequency settling time.

It supports three output modes-divide-by-2 (fo/2), fundamental (fo), and doubler (2fo)-with independent RF power levels (10 dBm typ. at fo/2, 7 dBm typ. at fo, −4 dBm typ. at 2fo) and harmonic suppression down to −58 dBc (4th harmonic at fo). Closed-loop phase noise reaches −117 dBc/Hz at 1 kHz offset (integer mode, 100 MHz PFD).

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, and thermal resistance of 20 °C/W (junction-to-paddle).

Key Features

Applications

Equivalent & Alternatives

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

Compared with HMC839LP6CE, HMC838LP6CE offers reduced bandwidth and feature set for cost-sensitive mid-band use, while ADF4371BCPZ extends frequency reach and integration at the expense of in-band phase noise performance and specialized features like cycle-slip prevention.

Availability

HMC839LP6CE is available at Aetrix Electronics and suitable for cellular infrastructure, phased array radar, and communications test equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceability.

Supply support for HMC839LP6CE 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 line, renowned for microwave/mmWave ICs used in defense, aerospace, and wireless infrastructure.

The HMC839LP6CE belongs to Hittite's integrated PLL+VCO family, designed specifically for high-performance wireless infrastructure where spectral purity, fast hopping, and multi-band flexibility are mandatory.

FAQ

What output frequency bands does the HMC839LP6CE support?

The HMC839LP6CE supports three distinct RF output bands: 1050–1205 MHz (via internal divide-by-2), 2100–2410 MHz (fundamental VCO output), and 4200–4820 MHz (doubler mode). Each band is enabled by configuring the appropriate output divider and matching network per the evaluation board schematics. The device does not support simultaneous multi-band output.

How does the HMC839LP6CE achieve ultra-low phase noise?

The HMC839LP6CE achieves ultra-low phase noise through a combination of ultra-low-noise charge pump design (−142 dBc/Hz at 1 kHz offset, input-referred), optimized VCO tank topology, autocalibrated tuning voltage, and advanced delta-sigma fractional-N modulation that suppresses quantization spurs. Its −227 dBc/Hz figure of merit confirms best-in-class noise efficiency relative to power consumption.

Does the HMC839LP6CE require external loop filter components?

Yes, the HMC839LP6CE requires an external passive loop filter between the charge pump (CP pin) and VTUNE (pin 23). The filter design depends on desired loop bandwidth, stability, and phase margin - typical designs use 2nd- or 3rd-order RC networks. Evaluation boards (e.g., PCB 129513/129514) provide validated reference layouts and component values.

Can the HMC839LP6CE operate in integer-N mode only?

Yes, the HMC839LP6CE supports both integer-N and fractional-N modes. Integer mode is selected via register configuration and provides lower in-band spurs and improved close-in phase noise (−117 dBc/Hz at 1 kHz offset, 100 MHz PFD), making it preferred for applications prioritizing spectral purity over frequency resolution.

What is the purpose of the BIAS pin (pin 40) on the HMC839LP6CE?

The BIAS pin (pin 40) provides access to an internal 1.92 V ±20 mV precision reference voltage generated for internal bias circuits. It is not intended to drive external loads; measurement requires a 10 GΩ input impedance meter (e.g., Agilent 34410A). Connecting external capacitance or loading will distort internal bias points and degrade performance.