Analog Devices Inc. HMC422MS8TR

Overview

HMC422MS8TR from Analog Devices (formerly Hittite Microwave) is a GaAs MMIC double-balanced mixer IC with integrated LO amplifier, operating from 1.2 to 2.6 GHz RF/LO and DC–1 GHz IF. It delivers 8 dB typical conversion loss, +15 dBm input IP3 at 2 GHz, and requires only 0 dBm LO drive with 3 V / 30 mA single-supply operation. It serves as upconverter or downconverter in wireless infrastructure transceivers.

For engineers reviewing the HMC422MS8TR datasheet, HMC422MS8TR pinout, HMC422MS8TR application, or HMC422MS8TR equivalent, key selection criteria include its integrated LO amplifier enabling low-drive operation, 8 dB conversion loss, +8 dBm input P1dB, 23 dB LO-to-RF isolation, and MSOP-8 package compatibility with RF layout best practices.

Technical Context

The HMC422MS8TR implements a double-balanced Gilbert-cell mixer core with monolithically integrated GaAs LO amplifier, enabling full active mixing without external LO buffering. Its RF and IF ports are DC-coupled (RF), while LO is AC-coupled and 50 Ω matched - supporting both baseband and IF-sampling architectures.

Designed for fixed-frequency and tunable transceivers, it operates over –40°C to +85°C with guaranteed performance at 2 GHz under 3 V bias. The integrated LO amplifier dissipates <100 mW and enables stable conversion gain across temperature via internal biasing, eliminating external Vbias networks.

Key Specifications

Pinout & Package

Package: 8-lead MSOP (Mini Small Outline Package), RoHS-compliant, MSL1, 3 mm × 3 mm body, exposed paddle for thermal grounding.

Key Features

Applications

Equivalent & Alternatives

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

Compared with HMC422MS8TR, HMC1040LP4E offers broader frequency coverage at the cost of higher LO drive and conversion loss, while ADL5801ACPZ-R7 provides wider bandwidth and lower loss but consumes 4× more supply current and occupies >2× PCB area - making HMC422MS8TR optimal for compact, low-power 1.2–2.6 GHz infrastructure designs.

Availability

HMC422MS8TR is available at Aetrix Electronics and suitable for wireless local loop base stations, MMDS transmitters, and cellular infrastructure receivers requiring stable component supply, long-lifecycle support, and consistent RF performance across production batches.

Supply support for HMC422MS8TR 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 integrates its high-frequency RF portfolio into precision RF signal chain solutions for communications and defense markets.

The HMC422MS8TR belongs to Hittite's legacy GaAs MMIC mixer family, engineered specifically for low-LO-drive, high-linearity up/downconversion in licensed and unlicensed 1–3 GHz wireless infrastructure equipment.

FAQ

What is the recommended LO drive level for HMC422MS8TR?

The HMC422MS8TR is specified for 0 dBm LO drive at 2 GHz, enabling direct connection to low-power synthesizers without external amplification. Operating below this level increases conversion loss and degrades IP3; exceeding +13 dBm risks permanent damage per absolute maximum ratings. For optimal linearity and gain flatness, maintain LO drive within ±1 dB of 0 dBm across the 1.2–2.6 GHz band.

Can HMC422MS8TR operate as both an upconverter and downconverter?

Yes, the HMC422MS8TR supports bidirectional operation: RF and IF ports are functionally interchangeable depending on signal flow direction. As an upconverter, baseband or low-IF signals enter the IF port and mix with LO to generate RF output; as a downconverter, RF signals enter the RF port and produce IF output. Its double-balanced architecture ensures consistent isolation and linearity in both modes.

What is the maximum allowable DC current on the IF pin of HMC422MS8TR?

The IF pin of HMC422MS8TR must not source or sink more than ±10 mA DC current. Exceeding this limit risks non-function or irreversible die failure due to junction overheating. For DC-coupled applications, ensure baseband circuitry (e.g., op-amps or ADC drivers) complies with this current budget; for AC-coupled use, add a series capacitor sized to pass the required IF bandwidth without introducing phase error.

Is HMC422MS8TR still in active production?

HMC422MS8TR is marked OBSOLETE in official documentation, but Aetrix Electronics maintains legacy inventory and supports continued supply for existing designs. Analog Devices does not offer a direct replacement; engineering teams migrating should evaluate HMC1040LP4E or ADL5801ACPZ-R7 based on frequency, power, and footprint requirements - noting that HMC422MS8TR remains qualified for deployed systems requiring exact form-fit-function continuity.

What PCB layout practices are critical for HMC422MS8TR performance?

Successful implementation of HMC422MS8TR requires strict RF layout discipline: all GND pins (2,3,6,7) and the exposed paddle must connect to a solid, low-inductance ground plane using ≥6 thermal vias; RF and LO traces must be 50 Ω microstrip; Vdd requires a 10,000 pF chip capacitor placed within 2 mm of Pin 4; and IF routing must avoid coupling to noisy digital lines. Evaluation PCB 104813 (Rogers 4350) demonstrates validated reference layout.