Analog Devices Inc./Maxim Integrated MAX2674EVKIT+

Overview

MAX2674EVKIT+ from Maxim Integrated is an evaluation kit designed to validate the MAX2674 ultra-small, high-IP3 GPS/GNSS low-noise amplifier with integrated antenna switch and bias functionality. It supports L1-band GNSS signals (1575.42 MHz), delivers 18 dB typical gain and 0.75 dB noise figure, operates from 1.6V–3.6V, and enables rapid prototyping of receiver front-ends in smartphones and PNDs.

For engineers reviewing the MAX2674EVKIT+ datasheet, MAX2674EVKIT+ pinout, MAX2674EVKIT+ application, or MAX2674EVKIT+ equivalent, this kit provides full access to RF performance characterization-including in-band IIP3 (+5 dBm for MAX2676 variant), ANT port autosensing threshold (75–850 µA), shutdown current (<10 µA), and S-parameter measurement points-under real-world supply and thermal conditions.

Technical Context

The MAX2674EVKIT+ implements a complete reference design for the MAX2674 WLP-6 LNA, including matched input network (10 pF DC-block + 88 nH series inductor), on-board 39 pF/100 pF VCC decoupling, and direct-access test points for RFIN, RFOUT/SHDN, ANT, and GNDAC/GNDDC. It replicates the production-level impedance environment required to verify 15 dB input/output return loss and >45 dB reverse isolation.

It supports dual-mode operation: active LNA path (RFIN → RFOUT) and antenna-switched path (ANT → RFOUT), with automatic detection triggered by ANT current draw ≥75 µA. The board includes logic-level SHDN control via 25 kΩ resistor and provisions for external antenna bias delivery through the ANT terminal.

Key Specifications

Availability

MAX2674EVKIT+ is available at Aetrix Electronics and suitable for GNSS receiver validation, front-end module development, and antenna-integrated LNA qualification requiring stable component supply, traceable calibration, and documented RF performance benchmarks.

Supply support for MAX2674EVKIT+ 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

Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in analog, mixed-signal, and RF solutions for precision sensing, power management, and connectivity applications.

The MAX2674/MAX2676 product line was engineered specifically for space-constrained GNSS front-ends in mobile devices, integrating LNA, antenna switch, and bias delivery into a single 0.86mm × 1.26mm wafer-level package to eliminate discrete sensing and switching circuitry.

FAQ

What is the primary function of the MAX2674EVKIT+?

The MAX2674EVKIT+ is an evaluation kit that enables full characterization of the MAX2674 and MAX2676 GPS/GNSS LNAs. It provides calibrated RF paths, accessible test points, and verified layout for measuring gain, noise figure, IIP3, and antenna autosensing behavior under real operating conditions. The MAX2674EVKIT+ does not operate standalone-it requires connection to a signal generator, spectrum analyzer, or network analyzer to evaluate the underlying MAX2674 or MAX2676 IC.

Does the MAX2674EVKIT+ support both MAX2674 and MAX2676 devices?

Yes, the MAX2674EVKIT+ is compatible with both the MAX2674 (optimized for 18 dB typical gain) and MAX2676 (optimized for +5 dBm in-band IIP3). The board's passive matching network and bias configuration are identical for both variants, as confirmed in the "Typical Operating Circuit" and "Ordering Information" sections of the MAX2674/MAX2676 datasheet. No hardware modification is needed to swap between them.

How is antenna autosensing validated using the MAX2674EVKIT+?

The MAX2674EVKIT+ allows direct measurement of the ANT pin current threshold (75–850 µA) that triggers automatic switching from RFIN to ANT path. By injecting controlled current into the ANT terminal and monitoring RFOUT response with a spectrum analyzer, users can confirm the device transitions at the specified threshold-validating the feature described in the "Autodetect Antenna Connection" section of the datasheet. The MAX2674EVKIT+ includes dedicated test pads for this purpose.

Can the MAX2674EVKIT+ be used to measure noise figure accurately?

Yes-the MAX2674EVKIT+ layout follows Maxim's recommended RF grounding, decoupling, and impedance control practices (per AN1891 and datasheet Layout Guidelines), enabling repeatable noise figure measurements down to 0.75 dB for the MAX2674. It includes SMA connectors with 50 Ω matched traces and minimizes parasitic coupling, satisfying the conditions under which the datasheet's NF specification (VCC = 3.3 V, TA = +25°C) was characterized.

Is the MAX2674EVKIT+ RoHS-compliant and lead-free?

Yes, the MAX2674EVKIT+ uses RoHS-compliant components and assembly processes. Its designation includes the "+" suffix, which Maxim specifies as denoting lead(Pb)-free/RoHS-compliant packaging per the "Ordering Information" table. All PCB materials, solder mask, and surface finish meet IPC-J-STD-609 Class 1 requirements for halogen-free and lead-free compliance.