Analog Devices Inc./Maxim Integrated MAX2472EUT+T

Overview

The MAX2472EUT+T from Maxim Integrated is a dual-output, wideband VCO buffer amplifier operating from 500MHz to 2500MHz with +2.7V to +5.5V supply, delivering -5dBm into 50Ω while maintaining harmonic suppression below -25dBc and reverse isolation of 49dB at 900MHz - used in cellular transceivers to isolate voltage-controlled oscillators from mixer and PLL loads.

For engineers reviewing the MAX2472EUT+T datasheet, MAX2472EUT+T pinout, MAX2472EUT+T application, or MAX2472EUT+T equivalent, key selection criteria include its dual open-collector outputs, high input impedance (>250Ω at 900MHz), SOT23-6 package footprint, and guaranteed performance across -40°C to +85°C for RF signal routing in compact wireless modules.

Technical Context

The MAX2472EUT+T implements a two-stage wideband architecture: a high-input-impedance common-emitter amplifier followed by two independent open-collector output stages. Its design enables simultaneous buffering of a single VCO signal to multiple downstream blocks (e.g., mixer and prescaler) without signal coupling or degradation.

Reverse isolation of 49dB at 900MHz and harmonic suppression below -25dBc are achieved through internal biasing and optimized RF layout, while the open-collector outputs allow flexible AC-coupled termination using external inductors or resistors - supporting both high-gain reactive matching and low-gain resistive biasing per application need.

Key Specifications

Pinout & Package

Package: SOT23-6 - ultra-small surface-mount package (2.9mm × 1.6mm × 1.1mm) with exposed pad for thermal management and RF grounding.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar VCO buffer amplifier applications.

Compared with MAX2473EUT+T and QPL9057TR13, the MAX2472EUT+T uniquely provides dual isolated outputs in an open-collector configuration - essential for preventing cross-talk in multi-path RF architectures where oscillator stability is critical.

Availability

MAX2472EUT+T is available at Aetrix Electronics and suitable for cellular transceivers, private mobile radios, and ISM-band wireless sensor nodes requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for MAX2472EUT+T 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 demanding industrial, communications, and consumer applications.

The MAX2472EUT+T belongs to Maxim's high-frequency RF buffer amplifier product line, engineered specifically to replace discrete transistor buffers in VCO distribution networks where reverse isolation, low power, and small size are mandatory.

FAQ

What is the operating temperature range for the MAX2472EUT+T?

MAX2472EUT+T is specified for continuous operation from -40°C to +85°C. This industrial temperature range ensures reliable performance in mobile radios, outdoor wireless sensors, and automotive infotainment systems where ambient conditions vary widely. All AC and DC electrical characteristics in the datasheet are guaranteed across this full range, with typical values measured at +25°C.

Does the MAX2472EUT+T require external matching components?

Yes, the MAX2472EUT+T requires external matching: each open-collector output needs a pull-up element (inductor or resistor) and an AC-coupling capacitor. Recommended values - such as 12nH inductor and 1pF capacitor at 900MHz - are provided in the datasheet's Table 1. Input matching may also be needed for 50Ω VCO modules to optimize S11 and reverse isolation.

Can the MAX2472EUT+T drive 50Ω loads directly?

No, the MAX2472EUT+T cannot drive 50Ω loads directly because its outputs are open-collector. To deliver -5dBm into 50Ω, a reactive or resistive pull-up network must be used to set DC bias and provide proper RF termination. Typical configurations use an RF choke to VCC followed by a series capacitor to the 50Ω load, forming a high-pass matched network.

How does the MAX2472EUT+T achieve high reverse isolation?

The MAX2472EUT+T achieves 49dB reverse isolation at 900MHz through its two-stage wideband architecture: a high-input-impedance common-emitter stage followed by isolated open-collector output transistors. Layout optimization - including separate GND pins (pins 2 and 5) tied directly to ground plane - further suppresses feedback paths that cause oscillator pulling.

Is the MAX2472EUT+T pin-compatible with any other Maxim RF buffers?

No, the MAX2472EUT+T is not pin-compatible with other Maxim RF buffers such as MAX2473EUT+T. Although both use SOT23-6 packages, their pinouts differ: MAX2472EUT+T assigns OUT1 to pin 3 and OUT2 to pin 1, while MAX2473EUT+T uses pin 3 for BIAS and pin 1 for OUT. PCB layout must be redesigned when substituting between these variants.