Analog Devices Inc. 113758-HMC571LC5

Overview

HMC571LC5 from Analog Devices (formerly Hittite Microwave) is a GaAs MMIC I/Q downconverter IC operating from 21–25 GHz RF, with 9 dB small-signal conversion gain, 3.0 dB noise figure, and 18 dB image rejection. It integrates an LNA, active x2 LO multiplier, and image-reject mixer to eliminate post-LNA filtering and suppress thermal noise at the image frequency-enabling compact, surface-mount radio front-ends for millimeter-wave systems.

For engineers reviewing the HMC571LC5 datasheet, HMC571LC5 pinout, HMC571LC5 application, or HMC571LC5 equivalent, this device requires attention to its 32-pin 5×5 mm SMT package, external 90° IF hybrid requirement, LO drive sensitivity (+4 dBm typical), DC-coupled IF outputs with current limits, and RF/LO port AC coupling-all critical for phase-coherent downconversion in radar and SATCOM receivers.

Technical Context

The HMC571LC5 implements a monolithic image-reject mixer (IRM) architecture with integrated LNA and active x2 LO multiplier, enabling direct RF-to-IF downconversion without external image filters. Its quadrature outputs (IF1/IF2) require an external 90° hybrid to select upper or lower sideband-no internal phase-shifting circuitry is present.

Operation relies on precise LO frequency planning: LO range is 9–14 GHz, producing IF output from DC to 3.5 GHz when RF is 21–25 GHz. Performance is specified at Vdd = 3.5 Vdc, TA = +25°C, and IF = 100 MHz, with total supply current of 125–165 mA across temperature.

Key Specifications

Pinout & Package

32-lead 5×5 mm leadless RoHS-compliant SMT package with alumina body, gold-over-nickel plating, and exposed ground paddle requiring soldering to PCB RF ground per MSL3 reflow profile (peak 260°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with HMC571LC5, HMC1048LP5E offers broader RF coverage but sacrifices noise performance and integration; ADMV1013ACPZ adds programmability and frequency range at the cost of higher NF, larger footprint, and digital complexity-making HMC571LC5 optimal for fixed-frequency, low-noise, space-constrained E-band receivers.

Availability

HMC571LC5 is available at Aetrix Electronics and suitable for point-to-point radio, military radar/EW, and satellite communications systems requiring stable component supply, consistent RF performance across temperature, and RoHS-compliant SMT assembly.

Supply support for HMC571LC5 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, SiGe, and RF SOI solutions for defense, aerospace, and communications markets.

The HMC571LC5 belongs to Hittite's legacy IRM product line, designed specifically for compact, high-performance image-reject downconversion in E-band wireless infrastructure and electronic warfare platforms.

FAQ

What is the recommended LO drive level for optimal performance of the HMC571LC5?

The HMC571LC5 achieves best conversion gain (9 dB), noise figure (3.0 dB), and image rejection (18 dB) at +4 dBm LO drive. Deviations reduce gain and increase NF-e.g., at +2 dBm, gain drops ~1.5 dB and NF rises ~0.5 dB. The absolute maximum LO drive is +13 dBm; exceeding this risks permanent damage. Always verify LO source power with a calibrated RF power meter before connecting to the HMC571LC5.

Does the HMC571LC5 require an external 90° hybrid, and why?

Yes, the HMC571LC5 requires an external 90° hybrid to combine its IF1 and IF2 outputs and select either upper or lower sideband. The device itself provides only quadrature IF signals without internal phase shifting or summation-so the hybrid is essential for functional downconversion. Without it, the HMC571LC5 delivers two independent IF streams unsuitable for standard I/Q demodulation. Hybrid selection must match IF frequency range (DC–3.5 GHz) and impedance (50 Ω).

Can the IF outputs of the HMC571LC5 be used for DC-coupled baseband operation?

Yes, the IF1 and IF2 outputs of the HMC571LC5 are DC-coupled and support true zero-IF operation-but only if each output sinks or sources ≤3 mA. Exceeding this current causes non-function or failure. For most baseband applications, external series capacitors are still recommended to block DC offsets and prevent ground loop issues. Verify DC bias conditions with oscilloscope measurements before committing to DC-coupled layout.

What thermal management is required for reliable operation of the HMC571LC5?

The HMC571LC5 features an exposed ground paddle that must be soldered to a solid PCB ground plane using ≥6 thermal vias (0.3 mm diameter, spaced ≤1 mm apart) to achieve effective heat dissipation. With 165 mA supply current at 3.5 V, power dissipation reaches ~578 mW-requiring thermal resistance <50°C/W to keep channel temperature below 175°C. Avoid conformal coating over the paddle and ensure reflow profile meets MSL3 (260°C peak) specifications.

Is the HMC571LC5 pin-compatible with other Hittite IRM devices like the HMC570LC5?

No, the HMC571LC5 is not pin-compatible with HMC570LC5 or other variants. While both are 5×5 mm packages, HMC571LC5 uses 32 leads with specific VddLO/VddLO2/VddRF separation and N/C pin assignments distinct from HMC570LC5's 24-pin layout and different biasing scheme. PCB layout must be designed exclusively for HMC571LC5; no mechanical or electrical interchangeability exists without redesign.