Analog Devices Inc. HMC786LP4ETR

Overview

HMC786LP4ETR from Analog Devices (formerly Hittite Microwave) is a high-dynamic-range BiCMOS double-balanced downconverter/upconverter mixer with integrated LO amplifier, operating from 700–1100 MHz RF, 750–1350 MHz LO, and 50–250 MHz IF. It delivers 7.5 dB typical conversion loss, +38 dBm input IP3, and +27 dBm input P1dB at 0 dBm LO drive, optimized for cellular base station receivers and transmitters.

For engineers reviewing the HMC786LP4ETR datasheet, HMC786LP4ETR pinout, HMC786LP4ETR application, or HMC786LP4ETR equivalent, key selection criteria include its 24-lead 4×4 mm QFN package, high-side LO architecture, integrated LO buffer enabling -1 to +6 dBm drive range, and differential IF interface supporting both DC-coupled and AC-coupled configurations.

Technical Context

The HMC786LP4ETR implements a passive MMIC mixer core with on-chip LO amplifier and balun structures for single-ended RF/LO and differential IF interfaces. Its internal resistive G_BIAS divider (15 kΩ to Vcc and ground) sets nominal 2.5 V bias, enabling trade-offs between conversion loss and linearity via external adjustment.

It supports both downconversion (IF = 150 MHz typical) and upconversion (IF = 120 MHz typical) modes with identical RF/LO frequency coverage. High isolation-24 dB LO-to-RF, 30 dB LO-to-IF, and 39 dB RF-to-IF (typ.)-is achieved through balanced topology and optimized internal layout in the 4×4 mm QFN package.

Key Specifications

Pinout & Package

Package: 24-lead, 4×4 mm, 0.5 mm pitch QFN with exposed thermal paddle (RoHS-compliant, MSL1, matte tin finish). Ground paddle and pins 2,5,15,17 must be soldered to PCB RF ground 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 HMC686LP4ETR, the HMC786LP4ETR delivers +3 dB higher IP3 and 1 dB lower conversion loss at same LO drive, directly improving receiver dynamic range. Against ADL5801ACPZ-R7, it offers lower power, smaller footprint, and integrated LO drive-but lacks broadband coverage beyond 1.1 GHz.

Availability

HMC786LP4ETR is available at Aetrix Electronics and suitable for cellular infrastructure, wireless repeater systems, and WiMAX subscriber equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for HMC786LP4ETR 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, including mixers, amplifiers, and PLLs for communications and defense applications.

The HMC786LP4ETR belongs to Hittite's legacy high-linearity BiCMOS mixer family, designed specifically for demanding 3G/4G/LTE base station and repeater signal chains where IP3, isolation, and integration are critical.

FAQ

What is the recommended LO drive level for optimal performance of the HMC786LP4ETR?

The HMC786LP4ETR achieves best linearity and conversion loss at 0 dBm LO drive, with operational range from -1 to +6 dBm. At 0 dBm, typical conversion loss is 7.5 dB and input IP3 reaches +38 dBm. Driving outside this range trades off distortion performance for power efficiency or gain, and the LO_BIAS pin allows fine-tuning of LO amplifier current to maintain stability across temperature.

Can the HMC786LP4ETR be used in both upconverter and downconverter configurations?

Yes, the HMC786LP4ETR supports both upconversion and downconversion modes. In downconversion, RF is 0.7–1.1 GHz and IF is 50–250 MHz (150 MHz typical); in upconversion, IF is 50–250 MHz (120 MHz typical) and RF remains 0.7–1.1 GHz. The same pinout and biasing apply, with only LO frequency and signal routing adjusted per mode.

How should the G_BIAS pin be configured for minimal conversion loss in the HMC786LP4ETR?

To minimize conversion loss, set G_BIAS to 3.0 V using an external voltage source or resistor divider. At 3.0 V, conversion loss drops ~1.2 dB versus the nominal 2.5 V setting, though IP3 decreases by ~2 dB. The internal 15 kΩ divider allows precise control, and the datasheet provides curves showing CG vs. G_BIAS across temperature and frequency.

Is the HMC786LP4ETR pin-compatible with any other Hittite/Analog Devices mixers?

Yes, the HMC786LP4ETR is pin-for-pin compatible with the HMC686LP4ETR, sharing identical 24-lead 4×4 mm QFN package, pinout, and footprint. This enables drop-in replacement where higher linearity (+38 dBm vs. +35 dBm IP3) and lower conversion loss (7.5 dB vs. 8.5 dB) are required without PCB redesign.

What thermal management considerations apply to the HMC786LP4ETR in continuous operation?

The HMC786LP4ETR has a junction-to-ground-paddle thermal resistance of 37 °C/W. With 130 mA total supply current at +5 V, power dissipation is ~650 mW. To maintain junction temperature ≤125 °C at 85 °C ambient, the exposed paddle must be soldered to a minimum 200 mm² copper area with ≥6 thermal vias (0.3 mm diameter) to inner ground planes. Derating begins above 85 °C at 27 mW/°C.