Analog Devices Inc. HMC774A

Overview

HMC774A from Analog Devices is a GaAs MMIC double-balanced mixer operating from 7 GHz to 40 GHz, optimized for both upconversion and downconversion with 13 dBm LO drive, 10.5–11 dB typical conversion loss, and passive operation requiring no DC bias - deployed in millimeter-wave point-to-point radios and military test equipment.

For engineers reviewing the HMC774A datasheet, HMC774A pinout, HMC774A application, or HMC774A equivalent, key selection criteria include its 7–40 GHz RF/LO bandwidth, dc–10 GHz IF range, 20 dBm typical IP3, 32–50 dB LO-to-IF isolation, and 1.38 mm × 0.81 mm bare-die package suitable for microstrip-mounted millimeter-wave systems.

Technical Context

The HMC774A implements a passive, double-balanced topology using integrated balun structures to achieve high LO-to-RF and LO-to-IF isolation across two frequency bands: 7–22 GHz and 22–40 GHz. Its performance is specified at 13 dBm LO drive with IF = 500 MHz or 10 GHz, and it supports both upper-sideband downconversion and upconversion without external matching components.

This GaAs MMIC operates over −55°C to +85°C, requires no DC bias, and delivers stable conversion loss (10.5 dB typ. @ 7–22 GHz; 11 dB typ. @ 22–40 GHz), input P1dB (11–12 dBm), and noise figure (12–13 dB) across its full band - all enabled by monolithic integration of diode quad and broadband baluns.

Key Specifications

Pinout & Package

Package: 8-pad GaAs MMIC bare die (CHIP), dimensions 1.38 mm × 0.81 mm × 0.102 mm, metalized backside for eutectic or conductive epoxy die attach. Requires microstrip transmission lines and gold ribbon bonding per Analog Devices assembly guidelines.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar double-balanced mixer applications.

Compared with HMC774ALC3B, the HMC774A offers lower insertion loss and tighter thermal control in custom RF modules, while QPC1006 trades passive simplicity for gain and ease of use - making HMC774A optimal for high-frequency, high-isolation, zero-bias millimeter-wave designs.

Availability

HMC774A is available at Aetrix Electronics and suitable for point-to-point radios, military radar systems, and millimeter-wave test equipment requiring stable component supply across extended temperature ranges and high-frequency performance consistency.

Supply support for HMC774A 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 is a global leader in high-performance analog, mixed-signal, and RF ICs, serving communications, defense, instrumentation, and industrial markets with precision signal processing solutions.

The HMC774A belongs to Analog Devices' Hittite Microwave MMIC product line, engineered specifically for millimeter-wave infrastructure and defense applications demanding wideband, high-isolation, passive mixing performance from 7–40 GHz.

FAQ

What is the recommended LO drive level for optimal performance of the HMC774A?

The HMC774A is characterized and optimized for 13 dBm LO drive across its full 7–40 GHz range. Operating below this level increases conversion loss and degrades IP3 and isolation; exceeding it risks compression or reliability issues. All datasheet specifications - including 10.5–11 dB conversion loss and 20 dBm IP3 - assume 13 dBm LO input. The HMC774A does not support variable LO drive tuning.

Does the HMC774A require DC bias or external matching components?

No, the HMC774A is a fully passive double-balanced mixer requiring no DC bias and no external matching components. Its RF, LO, and IF ports are internally matched to 50 Ω and dc-coupled. Only the IF port requires external DC blocking (via series capacitor) if operation above DC is not needed. This eliminates bias networks and simplifies layout in high-frequency designs.

What is the maximum IF bandwidth supported by the HMC774A?

The HMC774A supports an IF frequency range from DC to 10 GHz, verified by datasheet measurements showing flat conversion gain and consistent IP3 up to 10 GHz. At 10 GHz IF, conversion loss remains within 1 dB of its low-frequency value, and return loss exceeds 10 dB. This enables direct sampling of wideband IF signals without intermediate frequency translation stages.

How is the HMC774A mounted and interconnected in a PCB assembly?

The HMC774A is an 8-pad bare die (C-8-12 package) requiring microstrip transmission lines on alumina or quartz substrates. It must be eutectically or conductively epoxied to a grounded RF plane, with 3-mil gold ribbon bonds (<0.31 mm length) to RF, LO, and IF pads. Die-to-substrate spacing should be 0.076 mm, and bond pad geometry matches the 0.081 mm × 0.100–0.150 mm dimensions shown in Figure 44.

What are the absolute maximum ratings for RF and LO input power on the HMC774A?

The HMC774A has an absolute maximum RF input power of 21 dBm and LO input power of 25 dBm. Exceeding these levels risks permanent damage to the GaAs diode quad or air-bridge structures. Continuous operation should remain within the specified 11–12 dBm P1dB range; the 21/25 dBm limits apply only to short-duration transient events under controlled thermal conditions.