Analog Devices Inc. 119916-HMC689LP4

Overview

HMC689LP4 from Analog Devices (formerly Hittite Microwave) is a BiCMOS MMIC double-balanced mixer with integrated LO amplifier, designed for RF-to-IF downconversion and upconversion in 2.0–2.7 GHz systems. It delivers 7.5 dB typical conversion loss, +32 dBm input IP3, and +23 dBm input P1dB at 0 dBm LO drive, operating with +5 V supply and supporting DC–800 MHz differential IF output - ideal for LTE/WiMAX base station transceivers.

For engineers reviewing the HMC689LP4 datasheet, HMC689LP4 pinout, HMC689LP4 application, or HMC689LP4 equivalent, key selection criteria include its high-side LO optimization, 24-lead 4×4 mm QFN package with RF/IF balun integration, thermal performance up to +85°C, and compatibility with GSM/CDMA/OFDM signal chains requiring low spurious generation and robust LO-to-RF isolation.

Technical Context

The HMC689LP4 integrates a broadband LO amplifier driving a passive double-balanced mixer core, enabling both upconversion and downconversion with high linearity. Its internal RF and IF baluns provide single-ended 50 Ω RF input and differential 50 Ω IF ports, while LO bias (LO_BIAS) and gate bias (G_BIAS) pins allow current tuning for dynamic range optimization.

It operates across -40°C to +85°C with absolute max ratings of +23 dBm RF input and +10 dBm LO drive. Thermal resistance is 27.6°C/W (channel-to-paddle), and the device requires full ground paddle soldering per MSL1 reflow profile - critical for RF return loss stability and isolation performance above 26 dB (LO–RF) and 24 dB (RF–IF).

Key Specifications

Pinout & Package

Package: 24-lead, 4 mm × 4 mm × 0.85 mm exposed-pad QFN (MSL1, Sn/Pb or RoHS matte Sn). Ground paddle must be soldered to PCB RF ground plane using ≥9 vias for optimal thermal and RF performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with HMC689LP4, HMC688LP4 offers identical packaging and footprint but trades LO-side optimization for slightly reduced linearity, while ADL5802ACPZ-R7 sacrifices integration and IP3 for broader frequency coverage - making HMC689LP4 the optimal choice for fixed-band, high-dynamic-range 2.0–2.7 GHz infrastructure designs.

Availability

HMC689LP4 is available at Aetrix Electronics and suitable for LTE base station receivers, WiMAX transmitters, GSM/CDMA repeaters, and OFDM test equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing for industrial deployment.

Supply support for HMC689LP4 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 continues to manufacture, support, and qualify its high-frequency RF IC portfolio including GaAs and BiCMOS MMICs.

The HMC689LP4 belongs to Hittite's legacy high-linearity mixer product line, engineered specifically for wireless infrastructure applications demanding low conversion loss, high IP3, and integrated LO drive in compact SMT packages.

FAQ

What is the recommended LO drive level for optimal performance of the HMC689LP4?

The HMC689LP4 achieves best linearity and conversion loss at 0 dBm LO drive, with specified operation from -3 dBm to +3 dBm. At 0 dBm, it delivers 7.5 dB typical conversion loss and +32 dBm input IP3. Driving outside this range increases conversion loss or compresses dynamic range - the HMC689LP4's integrated LO amplifier eliminates need for external drivers within this window.

Does the HMC689LP4 support both upconversion and downconversion?

Yes, the HMC689LP4 supports both upconversion and downconversion. Its double-balanced architecture and broadband IF response (DC–800 MHz) enable flexible use: as a downconverter (e.g., RF=2.5 GHz → IF=300 MHz with LO=2.8 GHz) or upconverter (IF=300 MHz → RF=2.5 GHz with same LO). Performance metrics like IP3 and P1dB apply equally in both modes per datasheet characterization.

How should the ground paddle of the HMC689LP4 be connected on the PCB?

The exposed ground paddle of the HMC689LP4 must be soldered directly to the PCB's main RF/DC ground plane using ≥9 thermal vias (0.3 mm diameter, spaced ≤1 mm apart). This connection is mandatory for achieving specified RF performance - including 26 dB LO–RF isolation and -40 dB return loss - and for maintaining thermal resistance at 27.6°C/W. Floating or undersoldered paddles degrade noise figure and cause instability.

Can the HMC689LP4 operate with a single +5 V supply?

Yes, the HMC689LP4 operates from a single +5 V supply applied to all three Vcc pins (8, 10, 24), drawing 152–185 mA total. While the datasheet shows separate Vcc1/Vcc2/Vcc3 labels, they are internally tied and require only one regulated +5 V source with proper local decoupling (1 nF + 0.1 µF per pin). No negative or auxiliary supplies are needed for standard operation of the HMC689LP4.

Is the HMC689LP4 pin-compatible with any other Hittite/Analog Devices mixers?

Yes, the HMC689LP4 is pin-for-pin compatible with the HMC688LP4, differing only in internal LO amplifier optimization (high-side vs. low-side LO). Both share identical 24-lead 4×4 mm QFN packaging, pin functions, and footprint. This allows drop-in replacement in existing layouts when switching between high-side and low-side LO system architectures - no PCB redesign is required for the HMC689LP4 or HMC688LP4.