Analog Devices Inc. HMC560LM3

Overview

HMC560LM3 from Hittite Microwave Corporation is a GaAs MMIC passive double-balanced mixer operating from 24–40 GHz RF/LO and DC–17 GHz IF, with +21 dBm input IP3, 35 dB LO/RF isolation, and no DC bias required. It serves as a broadband downconverter or upconverter in millimeter-wave radio front-ends without external components.

For engineers reviewing the HMC560LM3 datasheet, HMC560LM3 pinout, HMC560LM3 application, or HMC560LM3 equivalent, key selection criteria include its 24–40 GHz fundamental mixing range, passive topology eliminating bias networks, leadless LM3 SMT package compatibility with surface-mount manufacturing, and verified performance at +13 dBm LO drive.

Technical Context

The HMC560LM3 employs an on-chip balun-based double-balanced topology fabricated in GaAs MESFET process, enabling high port-to-port isolations (LO/RF ≥35 dB typ., LO/IF ≥30 dB typ.) and wide IF bandwidth extending to DC. Its passive architecture eliminates DC power requirements and simplifies integration into compact RF modules.

It operates as both upconverter and downconverter with consistent conversion loss (10–14 dB) and noise figure (10–14 dB SSB) across 24–40 GHz, supported by measured spurious output data showing dominant m=1,n=0 and m=0,n=1 products below –5 dBc. Thermal resistance is 188 °C/W (channel to package bottom), with absolute max LO drive of +23 dBm.

Key Specifications

Pinout & Package

Package: LM3 leadless chip carrier (25 mm²), non-hermetic epoxy-sealed, gold-over-nickel plating, designed for microstrip-to-CPWG transitions and GSG probe testing. All grounds must be soldered to PCB RF ground per outline drawing.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar passive mmWave mixer applications.

Compared with HMC560LM3, HMC1048LP3E trades linearity and loss for wider bandwidth, while HMC774ALC3 reduces LO drive demand at the cost of upper-frequency reach - both require identical LM3 footprint but differ in RF performance trade-offs critical for Ka-band system partitioning.

Availability

HMC560LM3 is available at Aetrix Electronics and suitable for test equipment, point-to-point radios, and military communications systems requiring stable component supply across extended temperature ranges (–55°C to +85°C) and high-reliability mmWave performance.

Supply support for HMC560LM3 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

Hittite Microwave Corporation (now part of Analog Devices) specialized in high-frequency RFICs and MMICs for microwave and millimeter-wave applications, with expertise in GaAs and GaN processes.

The HMC560LM3 belongs to Hittite's LM3-series passive mixer family, designed specifically for surface-mount integration in Ka-band communication, radar, and instrumentation systems where wirebond-free reliability and broadband performance are essential.

FAQ

What is the recommended LO drive level for optimal performance of the HMC560LM3?

The HMC560LM3 achieves best conversion loss and isolation at +13 dBm LO drive, as specified in all typical performance data. Operating below +11 dBm increases conversion loss; exceeding +15 dBm risks compression and degrades IP3. The absolute maximum LO drive is +23 dBm, but sustained operation above +15 dBm is not recommended for reliability. All HMC560LM3 characterization assumes +13 dBm LO drive unless otherwise noted.

Does the HMC560LM3 require DC bias or external matching components?

No, the HMC560LM3 is a fully passive double-balanced mixer requiring no DC bias voltage or current. It also needs no external matching components - all ports (RF, LO, IF) are internally matched to 50 Ω across their rated bandwidths. This eliminates bias networks, decoupling capacitors, and impedance-matching stubs, simplifying layout and improving repeatability in mmWave designs using the HMC560LM3.

What is the maximum allowable IF current for the HMC560LM3 IF port?

The HMC560LM3 IF port must not source or sink more than ±2 mA of DC current. Exceeding this limit may cause non-function or permanent damage. For DC-coupled IF paths, ensure downstream circuitry presents minimal DC load; for AC-coupled operation, use a series capacitor sized to pass the required IF bandwidth (DC–17 GHz) while blocking DC current - this constraint applies strictly to the HMC560LM3 IF terminal.

Can the HMC560LM3 be used for both upconversion and downconversion?

Yes, the HMC560LM3 functions bidirectionally as both an upconverter and downconverter. Its passive double-balanced topology and symmetric port design enable full reuse of the same device in transmit and receive chains. Performance data (conversion loss, isolation, IP3) is validated for both modes, with all specifications in the datasheet derived from downconverter measurements unless explicitly labeled "Upconverter Performance" - confirming HMC560LM3 suitability for full-duplex Ka-band systems.

What PCB grounding requirements apply to the HMC560LM3 LM3 package?

The entire base of the HMC560LM3 LM3 package must be soldered to a solid, low-inductance PCB RF ground plane. Per Hittite's outline drawing, all ground contacts (including the package base and pins 1–3) require full-surface solder attachment - not just perimeter soldering. Inadequate grounding causes degraded isolation, increased conversion loss, and unstable performance above 30 GHz. The HMC560LM3 evaluation board uses CPWG transitions and dense ground vias to meet this requirement.