Analog Devices Inc./Maxim Integrated MAX2680AUT+T

Overview

MAX2680AUT+T from Maxim Integrated is a silicon-germanium (SiGe) double-balanced downconverter mixer optimized for RF-to-IF signal translation in portable wireless systems. It operates from 400MHz to 2500MHz RF input, accepts LO signals across the same range, and delivers IF output from 10MHz to 500MHz with 11.6dB conversion gain at 900MHz and 6.3dB noise figure. Designed for battery-powered ISM-band radios and cellular handsets, it supports single +2.7V to +5.5V supply operation.

For engineers reviewing the MAX2680AUT+T datasheet, MAX2680AUT+T pinout, MAX2680AUT+T application, or MAX2680AUT+T equivalent, this page delivers verified electrical parameters, validated SOT23-6 terminal mapping, confirmed shutdown behavior (<0.1μA), and real-world impedance-matching guidance for RFIN/IFOUT ports at 900MHz, 1950MHz, and 2450MHz bands.

Technical Context

The MAX2680AUT+T implements a Gilbert-cell-based double-balanced mixer architecture with single-ended RF, LO, and open-collector IF ports. Its on-chip bias cell enables active-low shutdown control, reducing supply current to <0.1μA while maintaining DC blocking on all AC-coupled inputs.

It requires external impedance-matching networks on RFIN (e.g., Z1=86nH, Z2=270pF, Z3=open at 400MHz) and IFOUT (e.g., L1=390nH, C2=39pF, R1=250Ω at 45MHz), with specified port impedances (e.g., 54−j179Ω at 900MHz RFIN) and LO return loss >10dB across 400–2500MHz.

Key Specifications

Pinout & Package

MAX2680AUT+T is housed in a RoHS-compliant 6-pin SOT23 package (top mark AAAR), with 1.3mm × 2.3mm footprint and 0.95mm height. Thermal resistance θ_JA is 115°C/W; maximum continuous power dissipation at +70°C is 696mW.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX2680AUT+T, MAX2681EUT+T trades 3.7mA extra supply current for +7.9dB higher IIP3 at 2450MHz, while MAX2682EUT+T adds 10mA and delivers +10.1dB IIP3 improvement-making MAX2680AUT+T the optimal balance of low power and adequate linearity for portable battery-operated radios.

Availability

MAX2680AUT+T is available at Aetrix Electronics and suitable for ISM-band radios, cellular handsets, and wireless data modems requiring stable component supply, guaranteed RoHS compliance, and full traceability from Maxim Integrated's production lot.

Supply support for MAX2680AUT+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) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and RF solutions for industrial, communications, and consumer markets.

The MAX2680AUT+T belongs to Maxim's SiGe downconverter mixer family, engineered specifically for ultra-low-power, miniature RF front-ends in portable wireless devices operating across 400MHz–2.5GHz.

FAQ

What is the absolute maximum RF input power rating for MAX2680AUT+T?

The MAX2680AUT+T specifies an absolute maximum RF input power of +10dBm into a 50Ω source, as defined in the Absolute Maximum Ratings table. Exceeding this level risks permanent damage to the RFIN ESD protection structure. For reliable operation, RF input should be limited to −25dBm per tone during two-tone IIP3 testing and kept below −10dBm in continuous-wave applications to maintain linearity and avoid compression.

Does MAX2680AUT+T require external biasing components on the IFOUT pin?

Yes, MAX2680AUT+T IFOUT is an open-collector output and requires an external pull-up inductor connected to VCC. The recommended value is 390nH at 45MHz, 330nH at 70MHz, or 82nH at 240MHz, per Table 4 in the datasheet. Without this inductor, the IF stage cannot develop proper DC bias or deliver rated conversion gain, resulting in severe signal attenuation and distortion.

Can MAX2680AUT+T operate with a 1.8V supply?

No, MAX2680AUT+T is not rated for 1.8V operation. Its specified supply range is +2.7V to +5.5V, with guaranteed performance only within that window. At 1.8V, internal bias circuits fail to activate, LO injection efficiency drops sharply, and conversion gain collapses-verified by supply-current vs. voltage curves showing no functional region below 2.5V. Use MAX2681EUT+T or MAX2682EUT+T only if lower voltage is required; neither supports 1.8V either.

What is the LO-to-IF isolation performance of MAX2680AUT+T at 900MHz?

At 900MHz LO frequency, MAX2680AUT+T provides ≥22dB LO-to-IF isolation, measured as LO leakage power at the IFOUT port. This value is confirmed in the Typical Operating Characteristics section (Figure MAX2680/1/2-28), where LO-to-IF isolation reaches 25dB at 900MHz. This isolation level prevents LO energy from contaminating the IF signal path and simplifies post-mixer filtering requirements.

How does the shutdown function behave during power-up sequencing?

During power-up, MAX2680AUT+T enters normal operation only after VCC reaches ≥2.0V and SHDN rises above 2.0V (VIH threshold). If SHDN remains ≤0.5V during VCC ramp, the device stays in shutdown (<0.1μA ICC) until SHDN is actively driven high. The turn-on delay is <500ns (per Figure MAX2680/1/2-31), ensuring rapid wake-up for time-critical receive bursts in TDMA or packet-based protocols.