Analog Devices Inc./Maxim Integrated MAX9994EVKIT#

Overview

MAX9994EVKIT# from Maxim Integrated is a fully assembled and factory-tested evaluation kit for the MAX9994 high-linearity UMTS/DCS/PCS base-station downconversion mixer. It supports RF input from 1700MHz to 2200MHz, LO frequencies from 1400MHz to 2000MHz, and delivers 8.3dB conversion gain with 26.2dBm IIP3 and 9.7dB noise figure at 200MHz IF.

For engineers reviewing the MAX9994EVKIT# datasheet, MAX9994EVKIT# pinout, MAX9994EVKIT# application, or MAX9994EVKIT# equivalent, this kit enables rapid bench validation of mixer linearity, LO switching isolation (45dB), IF output impedance transformation (200Ω diff → 50Ω SE via Mini-Circuits TC4-1W-7A balun), and dual-LO port selection using TP3.

Technical Context

The MAX9994EVKIT# implements the MAX9994 active mixer IC in a 20-pin thin QFN-EP package with integrated RF/LO baluns, LO buffer, SPDT LO switch, and differential IF amplifier. It uses discrete 470nH chokes (L1/L2) for IF biasing and a 10nH inductor (L3) to enhance LO-to-IF isolation.

Test setup requires +5.0V/300mA DC supply, two RF signal generators (1–3GHz), spectrum analyzer (≥3GHz), and power meter. The board includes SMA connectors (Johnson 142-0741-856), 0603/0402 C0G/X7R capacitors, and a 4:1 transformer for single-ended IF output.

Key Specifications

Availability

MAX9994EVKIT# is available at Aetrix Electronics and suitable for RF front-end validation, base-station transceiver development, and cellular infrastructure prototyping requiring stable component supply and traceable evaluation hardware.

Supply support for MAX9994EVKIT# 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) designs precision analog, mixed-signal, and RF ICs for communications, industrial, and automotive applications.

The MAX9994EVKIT# belongs to Maxim's RF mixer evaluation platform family, engineered specifically to accelerate design-in of high-linearity, broadband downconverters for cellular base stations and repeaters.

FAQ

What is the primary function of the MAX9994EVKIT#?

The MAX9994EVKIT# is a complete evaluation platform for the MAX9994 downconversion mixer IC. It enables functional verification of RF-to-IF conversion performance, LO port switching behavior, and linearity metrics including IIP3 and noise figure across UMTS, DCS, and PCS frequency bands. The MAX9994EVKIT# includes all necessary passive components, SMA interfaces, and test points for immediate bench use without assembly.

Does the MAX9994EVKIT# require external power supplies or signal sources?

Yes - the MAX9994EVKIT# requires a +5.0V DC supply capable of delivering up to 300mA, two RF signal generators (1–3GHz range), a spectrum analyzer (≥3GHz), and an RF power meter for full characterization. The MAX9994EVKIT# itself contains no onboard power regulation or signal generation; it is a passive evaluation interface for the MAX9994 IC under controlled test conditions.

How is LO port selection implemented on the MAX9994EVKIT#?

LO port selection is controlled via the LOSEL test point (TP3): grounding TP3 selects LO1, while leaving TP3 open (pulled high by 47kΩ resistor R4) selects LO2. This matches the MAX9994's internal SPDT switch logic and allows verification of 45dB LO1-to-LO2 isolation. The MAX9994EVKIT# schematic confirms direct routing from TP3 to the MAX9994 LOSEL pin without level-shifting circuitry.

Can the MAX9994EVKIT# be used for IF frequencies other than 200MHz?

Yes - the MAX9994EVKIT# supports IF tuning across 40MHz to 350MHz by scaling the IF bias inductors L1 and L2 per the resonance equation f = 1/(2π√LC). The default 470nH value targets ~140MHz; lower IFs require larger inductance. The MAX9994EVKIT# documentation provides explicit guidance for retuning, and the differential IF output remains valid across the full specified IF band.

What thermal considerations apply to the MAX9994EVKIT# during operation?

The MAX9994EVKIT# mounts the MAX9994ETP in a 20-pin thin QFN-EP package with an exposed paddle that must be soldered to a grounded PCB plane for thermal and electrical integrity. The board uses nine plated vias beneath the EP to connect to inner-layer ground planes. Operating temperature range is -40°C to +85°C case temperature, and proper thermal coupling ensures stable gain and linearity during extended testing of the MAX9994EVKIT#.