Analog Devices Inc. 117720-HMC649LP6

Overview

HMC649LP6 from Analog Devices (formerly Hittite Microwave) is a GaAs MMIC 6-bit digital phase shifter operating from 3–6 GHz, delivering 360° phase coverage with 5.625° LSB resolution, ≤3° RMS phase error, and ±0.5 dB insertion loss variation across all states-used in radar beamforming and satellite communications RF front-ends.

For engineers reviewing the HMC649LP6 datasheet, HMC649LP6 pinout, HMC649LP6 application, or HMC649LP6 equivalent, key selection criteria include its 3–6 GHz bandwidth, 50 Ω internal matching, +5 V/−5 V dual-supply operation, 28-pin QFN package, and low RMS phase error critical for coherent array systems.

Technical Context

The HMC649LP6 implements a monolithic GaAs MMIC architecture with six independent CMOS-compatible control bits driving integrated switching networks to achieve discrete phase states. Its design uses distributed transmission-line and switched-path topology optimized for broadband 3–6 GHz performance without external matching components.

It operates with dual bias rails (Vdd = +5 V, Vss = −5 V), accepts 0/+5 V positive logic control inputs, and maintains 50 Ω input/output impedance across frequency-enabling direct integration into RF signal chains requiring precise, repeatable phase adjustment in phased-array transceivers.

Key Specifications

Pinout & Package

Package: 28-lead 6×6 mm plastic leadless QFN (MSL1, Sn/Pb finish), thermally enhanced with exposed ground paddle requiring solder connection to PCB RF ground plane.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digital phase shifter applications.

Compared with HMC649LP6E and QM11036, the HMC649LP6 offers unique combination of 6-bit resolution, 3–6 GHz bandwidth, and 3° RMS phase error-making it the preferred choice for X-band phased arrays where precision and bandwidth are non-negotiable.

Availability

HMC649LP6 is available at Aetrix Electronics and suitable for EW receivers, weather/military radar systems, and satellite communications equipment requiring stable component supply, long-term obsolescence management, and traceable sourcing.

Supply support for HMC649LP6 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 integrates its high-frequency RF portfolio into precision RF signal chain solutions for defense, aerospace, and communications.

The HMC649LP6 belongs to Analog Devices' legacy Hittite GaAs MMIC phase shifter product line, engineered specifically for high-accuracy, broadband beamforming in military radar and SATCOM systems.

FAQ

What is the operating frequency range of the HMC649LP6?

The HMC649LP6 operates from 3 GHz to 6 GHz, covering the entire X-band and part of Ku-band. This range supports applications including military radar, satellite uplinks, and electronic warfare receivers. Its specified performance-including insertion loss, phase error, and return loss-is validated across this full band per the datasheet's electrical specifications table and graphical data on pages 0–2 through 0–4.

Does the HMC649LP6 require external matching components?

No, the HMC649LP6 is internally matched to 50 Ω at both RFIN and RFOUT ports across 3–6 GHz, eliminating the need for external matching networks. This simplifies PCB layout and preserves signal integrity. The datasheet explicitly states "internally matched to 50 Ohms with no external components" and confirms 13 dB input and 10 dB output return loss typical values-validating broadband 50 Ω compatibility.

What are the supply voltage requirements for the HMC649LP6?

The HMC649LP6 requires dual supplies: Vdd = +5 V and Vss = −5 V, with respective current draws of 5.4 mA each. Control inputs accept 0/+5 V positive logic. These bias conditions are mandatory for specified RF performance; deviation risks increased phase error or compression. The absolute maximum ratings specify Vdd up to +12 V and Vss down to −12 V-but operation outside ±5 V degrades linearity and phase accuracy.

How many phase states does the HMC649LP6 support, and what is the LSB?

The HMC649LP6 supports 64 discrete phase states (2⁶) with a least significant bit (LSB) of 5.625°, enabling full 360° coverage in precise increments. The truth table on page 0–4 lists all major states, and the datasheet confirms "any combination of the above states will provide a phase shift approximately equal to the sum of the bits selected." This resolution is essential for narrow-beamwidth antenna array calibration.

Is the HMC649LP6 pin-compatible with the HMC649LP6E?

Yes, the HMC649LP6 and HMC649LP6E share identical pinout, package dimensions (6×6 mm QFN), and electrical specifications. The only differences are RoHS compliance (matte Sn vs. Sn/Pb finish) and peak reflow temperature rating (260 °C vs. 235 °C). Both parts use the same 28-lead footprint and truth table, making them functionally interchangeable in existing designs-subject to assembly process compatibility.