Analog Devices Inc. 113722-HMC552LP4

Overview

HMC552LP4 from Analog Devices (formerly Hittite Microwave) is a GaAs MMIC double-balanced mixer with integrated LO amplifier, operating from 1.6–3.0 GHz RF/LO and DC–1.0 GHz IF. It delivers +25 dBm input IP3, 8 dB typical conversion loss, 30 dB LO-to-RF isolation, and operates from a single +5 V supply drawing 62 mA - ideal for PCS/3G base station up/downconverters.

For engineers reviewing the HMC552LP4 datasheet, HMC552LP4 pinout, HMC552LP4 application, or HMC552LP4 equivalent, key selection criteria include its integrated LO amplifier eliminating external driver stages, robust Class 1C ESD rating, 4×4 mm QFN package with exposed ground paddle, and compatibility with low-LO-drive systems requiring -4 to +4 dBm.

Technical Context

The HMC552LP4 integrates a high-linearity double-balanced passive mixer core with a monolithic GaAs LO amplifier, enabling direct drive from low-power LO sources without external amplification. Its architecture supports both upconversion and downconversion with DC-coupled RF, LO, and IF ports - all matched to 50 Ω and requiring only external DC blocking capacitors on MIX LO, LO, and RF pins.

It features internal biasing for the LO amplifier via Pin 3 (BIAS), requiring an external 18 Ω resistor and three bypass capacitors for stable operation. The device achieves 8 dB noise figure (SSB) and maintains ≥25 dB LO-to-RF isolation across its full 1.6–3.0 GHz band, with thermal resistance of 105.6 °C/W to the ground paddle.

Key Specifications

Pinout & Package

Package: 24-lead 4×4 mm leadless QFN (LCC) with exposed ground paddle; RoHS-compliant Sn finish on HMC552LP4E variant, Sn/Pb on HMC552LP4; MSL1 rating; thermal pad must be soldered to PCB ground plane per Hittite land pattern guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with HMC552LP4, HMC551LP4 offers identical mechanical and electrical interface but narrower frequency coverage, while QM11036 trades integrated LO drive and higher IP3 for lower voltage operation and reduced integration - impacting bill-of-materials and layout complexity.

Availability

HMC552LP4 is available at Aetrix Electronics and suitable for wireless infrastructure, base station transceivers, and fixed wireless access equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for HMC552LP4 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, integrating its high-frequency RF/Microwave portfolio into ADI's broader signal chain solutions for communications, defense, and instrumentation.

The HMC552LP4 belongs to Hittite's GaAs MMIC mixer family designed specifically for high-linearity, broadband wireless infrastructure applications where integrated LO amplification, low conversion loss, and robust ESD performance are critical.

FAQ

What is the maximum RF input power rating for the HMC552LP4?

The HMC552LP4 has an absolute maximum RF/IF input rating of +31 dBm. However, for linear operation, the 1 dB compression point is typically +16 dBm at 1.9 GHz. Exceeding this level causes measurable gain compression and increased distortion, so system-level design should maintain RF input ≤ +13 dBm to preserve +25 dBm IP3 performance. Always refer to the HMC552LP4 datasheet's "Electrical Specifications" table for temperature-derated limits.

Does the HMC552LP4 require external baluns for operation?

No, the HMC552LP4 does not require external baluns. Its double-balanced architecture and 50 Ω DC-coupled RF, LO, and IF ports enable direct connection to single-ended 50 Ω sources and loads. External DC blocking capacitors are required on Pins 1 (MIX LO), 5 (LO), and 18 (RF), and the IF port (Pin 10) may require series capacitance if DC coupling is not needed. This eliminates balun-related insertion loss and phase imbalance.

How is the LO amplifier biased in the HMC552LP4?

The LO amplifier in the HMC552LP4 is biased through Pin 3 (BIAS), which requires an external 18 Ω resistor connected to +5 V and three bypass capacitors (100 pF, 1000 pF, and 2.2 µF) to ground as shown in the application circuit. This configuration sets the 62 mA supply current and ensures stable LO amplifier operation across temperature. Deviating from the recommended R1 value affects Icc and may degrade conversion loss or IP3.

Can the HMC552LP4 operate with IF frequencies down to DC?

Yes, the HMC552LP4 supports true DC-coupled IF operation on Pin 10. However, the IF port must not source or sink more than ±18 mA to avoid die malfunction or permanent damage. For AC-coupled IF applications, a series capacitor sized for the lowest IF frequency (e.g., 100 nF for 10 MHz) is recommended. DC coupling enables zero-IF receiver designs without transformer-based IF interfaces.

What is the thermal management requirement for the HMC552LP4?

The HMC552LP4 features an exposed ground paddle with a thermal resistance of 105.6 °C/W (junction-to-paddle). To maintain junction temperature ≤150°C at +85°C ambient, the paddle must be fully soldered to a multilayer PCB ground plane using ≥6 thermal vias (0.3 mm diameter) under the pad. Insufficient grounding causes thermal runaway and accelerated degradation of conversion loss and IP3 over time.