Analog Devices Inc. HMC966LP4ETR

Overview

HMC966LP4ETR from Analog Devices (formerly Hittite Microwave) is a GaAs MMIC I/Q downconverter IC designed for RF front-end signal translation in microwave receivers. It operates across 17–20 GHz RF, 7.5–11.75 GHz LO, and DC–3.5 GHz IF bands, delivering 14 dB small-signal conversion gain, 2.5 dB noise figure, and 40 dBc image rejection - enabling high-fidelity quadrature demodulation in point-to-point radio and EW systems.

For engineers reviewing the HMC966LP4ETR datasheet, HMC966LP4ETR pinout, HMC966LP4ETR application, or HMC966LP4ETR equivalent, this device requires attention to its 24-lead 4×4 mm QFN package, external 90° IF hybrid requirement, dual-supply biasing (VDRF/VDLO1/VDLO2), and RF/LO/IF AC-coupled 50 Ω interfaces for optimal sideband suppression and thermal noise mitigation.

Technical Context

The HMC966LP4ETR integrates a GaAs-based LNA followed by an image-reject mixer driven by an active x2 LO multiplier, eliminating the need for post-LNA image filtering. Its architecture inherently suppresses thermal noise at the image frequency while providing separate I and Q IF outputs.

Operation requires external 90° hybrid coupling at IF to select upper or lower sideband; amplitude balance (0.5 dB typ.) and phase balance (17° typ.) are specified without that hybrid. All RF, LO, and IF ports are AC-coupled and impedance-matched to 50 Ω, with dedicated ground paddle and 9 GND pins for RF integrity.

Key Specifications

Pinout & Package

Package: 24-lead, 4 mm × 4 mm, leadless RoHS-compliant QFN with exposed ground paddle (16 mm² footprint). Thermal performance relies on soldered paddle connection to PCB ground plane via ≥6 thermal vias.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar I/Q downconverter applications.

Compared with HMC1040LP4E and ADMV1013ACPZ, the HMC966LP4ETR delivers superior image rejection (40 dBc) and optimized gain-noise trade-off specifically for fixed 17–20 GHz E-band receivers, making it preferred for high-performance, size-constrained EW and satellite terminal applications.

Availability

HMC966LP4ETR is available at Aetrix Electronics and suitable for point-to-point radio, military radar receivers, and satellite communications systems requiring stable component supply, consistent RF performance across temperature, and long-term obsolescence management.

Supply support for HMC966LP4ETR 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 portfolio, specializing in GaAs and SiGe MMIC solutions for defense, aerospace, and communications.

The HMC966LP4ETR belongs to Hittite's IRM (Image Reject Mixer) product line, engineered for compact, high-performance microwave downconversion in space- and power-constrained EW, radar, and SATCOM platforms.

FAQ

What is the required LO drive level for optimal performance of the HMC966LP4ETR?

The HMC966LP4ETR is characterized at +6 dBm LO drive, delivering 14 dB conversion gain and 40 dBc image rejection. LO drive between +2 dBm and +6 dBm is supported; gain increases ~1 dB per 2 dB LO increase, but IP3 degrades above +6 dBm. The internal x2 multiplier means the applied LO frequency must be half the desired mixing frequency - e.g., 9.0 GHz LO input yields 18.0 GHz RF conversion.

Does the HMC966LP4ETR require an external 90° hybrid, and why?

Yes, the HMC966LP4ETR requires an external 90° hybrid at the IF outputs to combine I and Q signals and select either upper or lower sideband. The device provides separate IF1 and IF2 outputs with 0.5 dB amplitude and 17° phase imbalance (measured without hybrid); the hybrid corrects imbalance and enables sideband suppression exceeding 40 dBc in final implementation.

Can the HMC966LP4ETR operate with DC-coupled IF outputs?

Yes - both IF1 and IF2 pins are DC-coupled and support true zero-IF operation. However, each port must not sink or source more than 3 mA DC current to avoid malfunction or damage. For AC-coupled applications, a series capacitor sized for the lowest IF frequency (e.g., 100 pF for 1 GHz) is recommended.

What is the thermal management requirement for the HMC966LP4ETR?

The HMC966LP4ETR dissipates ~700 mW (3.5 V × 200 mA) and uses a 4×4 mm QFN with exposed ground paddle. Reliable operation requires soldering the paddle to a solid copper ground plane with ≥6 thermal vias (0.3 mm diameter) connecting to inner/ground layers. Board layout must follow RF thermal guidelines to maintain junction temperature below +85°C under continuous operation.

How does the HMC966LP4ETR achieve image rejection without an external filter?

The HMC966LP4ETR achieves image rejection via integrated quadrature architecture: the LNA feeds an image-reject mixer core that combines RF and LO-derived quadrature signals. This topology cancels the image frequency mathematically before IF output, delivering 40 dBc rejection across 17–20 GHz - eliminating the need for bulky, lossy external image filters typically required after conventional mixers.