Analog Devices Inc. HMC622LP4ETR

Overview

HMC622LP4ETR from Analog Devices (formerly Hittite Microwave) is a GaAs MMIC mixer IC with integrated IF and LO amplifiers, designed for RF upconversion and downconversion in 1.8–3.9 GHz systems. It delivers +23 dBm input IP3, 9 dB typical conversion gain (downconverter mode), and operates with only +3 dBm LO drive. It serves as the core signal translation element in compact transceivers for WiMAX, WCDMA, and PCS infrastructure.

For engineers reviewing the HMC622LP4ETR datasheet, HMC622LP4ETR pinout, HMC622LP4ETR application, or HMC622LP4ETR equivalent, key selection criteria include its high linearity at low LO power, dual-mode operation capability, 4×4 mm QFN package with exposed paddle, and integrated amplification eliminating external gain stages in IF/LO paths.

Technical Context

The HMC622LP4ETR implements a double-balanced mixer core with monolithically integrated LO amplifier and IF amplifier on a single GaAs die. Its architecture supports both upconversion and downconversion without reconfiguration, maintaining ≥27 dB LO-to-RF isolation and ≤10 dB noise figure across 200–550 MHz IF bandwidth.

It requires +5 V bias on VddIF and BIAS pins, draws 175–220 mA total supply current, and operates over –40°C to +85°C. All RF, LO, and IF ports are 50 Ω matched; DC blocking capacitors are required externally on MIXLO and LO pins, while IFIN uses an internal 51 nH inductor to ground.

Key Specifications

Pinout & Package

The HMC622LP4ETR is housed in a 24-lead, 4×4 mm RoHS-compliant QFN package with exposed ground paddle. All ground leads and the paddle must be soldered to PCB RF ground per Hittite Application Note land pattern guidance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with HMC1040LP4E and ADL5801ACPZ-R7, the HMC622LP4ETR uniquely balances high IP3 (+23 dBm), integrated gain (9 dB), and ultra-low LO drive (+3 dBm) in a single 4×4 mm package-making it optimal for power- and area-sensitive 3G/4G small cells and repeaters.

Availability

HMC622LP4ETR is available at Aetrix Electronics and suitable for PCS infrastructure, WiMAX CPE, and WCDMA repeater designs requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.

Supply support for HMC622LP4ETR 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 product portfolio for communications infrastructure and defense applications.

The HMC622LP4ETR belongs to Hittite's high-IP3 GaAs MMIC mixer family, engineered specifically for compact, high-linearity transceivers in 3G/4G wireless infrastructure where LO efficiency and integration reduce system-level complexity.

FAQ

What is the recommended LO drive level for optimal performance of the HMC622LP4ETR?

The HMC622LP4ETR achieves best linearity and conversion gain with +3 dBm LO drive, though it operates across 0 to +6 dBm. At +3 dBm, input IP3 reaches +23 dBm and conversion gain is 9 dB in downconverter mode. Deviating beyond this range increases distortion or reduces gain; the datasheet specifies +3 dBm as the nominal condition for all typical performance curves. Always verify LO drive with a calibrated source when characterizing the HMC622LP4ETR in your application.

Does the HMC622LP4ETR support both upconversion and downconversion without hardware changes?

Yes, the HMC622LP4ETR supports both upconversion and downconversion modes using the same pinout and biasing. The functional diagram and application circuits confirm identical RF, LO, and IF port assignments in both configurations. No external component rework or PCB modification is needed-only signal routing and LO/IF source configuration differ. This dual-mode capability is explicitly stated in the General Description and validated in evaluation boards 119242 (upconverter) and 119328 (downconverter).

What is the purpose of the CAP pin (Pin 9) on the HMC622LP4ETR?

The CAP pin (Pin 9) on the HMC622LP4ETR serves as an AC ground reference requiring a 0.01 μF external capacitor to PCB ground. It stabilizes internal bias nodes at low frequencies and suppresses low-frequency oscillation or drift. The datasheet mandates this capacitor in both upconverter and downconverter application circuits. Omitting it risks degraded noise figure, gain flatness, or instability below 100 MHz-critical for broadband IF interfaces in WiBro and TD-SCDMA systems using the HMC622LP4ETR.

How is thermal management handled for the HMC622LP4ETR in continuous operation?

The HMC622LP4ETR uses a 4×4 mm QFN package with an exposed ground paddle (Pin 17) that must be soldered to a thermally robust PCB ground plane. Its thermal resistance is 67.2 °C/W (junction-to-ground paddle), and maximum continuous dissipation at 85°C is 0.97 W, derating by 14.9 mW/°C above that. For reliable operation, designers must use ≥6 thermal vias under the paddle, connect all ground leads, and ensure ≥1 cm² copper area. These requirements are specified in the Absolute Maximum Ratings and Outline Drawing sections for the HMC622LP4ETR.

Is the HMC622LP4ETR pin-compatible with earlier Hittite mixer variants like HMC622LP4?

Yes, the HMC622LP4ETR is pin-compatible with the non-RoHS HMC622LP4, sharing identical 24-lead 4×4 mm footprint, pin numbering, and electrical functionality. The only differences are RoHS compliance (100% matte Sn finish vs. Sn/Pb), MSL1 rating with 260°C peak reflow (vs. 235°C), and updated package marking "H622". All application circuits, evaluation boards, and layout guidelines apply interchangeably. This backward compatibility is confirmed in the Package Information table for both HMC622LP4 and HMC622LP4E variants.