Analog Devices Inc./Maxim Integrated MAX9982ETP+T

Overview

The MAX9982ETP+T from Maxim Integrated is a fully integrated SiGe active downconverter mixer optimized for GSM850/GSM900 and CDMA850 base-station receivers. It functions as a high-linearity RF-to-IF signal converter with 2dB conversion gain, +26.8dBm input IP3, and built-in LO switch for <250ns frequency hopping-enabling direct replacement of passive mixers plus IF amplifiers in cellular infrastructure front-ends.

For engineers reviewing the MAX9982ETP+T datasheet, MAX9982ETP+T pinout, MAX9982ETP+T application, or MAX9982ETP+T equivalent, key selection criteria include its 825–915MHz RF range, single-ended RF/LO interface via on-chip baluns, 5V operation, and -40°C to +85°C extended temperature rating for outdoor base station deployment.

Technical Context

The MAX9982ETP+T implements a SiGe BiCMOS active mixer core with integrated LO driver, dual LO ports (LO1/LO2), and internal RF/LO baluns-supporting both high-side and low-side injection across 725–1085MHz LO and 70–170MHz IF bands. Its architecture eliminates external baluns and enables single-ended drive while maintaining >51dB LO1–LO2 isolation and <250ns digital LO selection via LOSEL.

It operates from a single 5V supply drawing 138–193mA, with bias set by a 249Ω resistor on RFBIAS to achieve specified linearity. The differential IF output requires external 560nH inductors and 137Ω pullups to VCC for 70–120MHz optimization, and features ESD protection alongside exposed-paddle QFN thermal management.

Key Specifications

Pinout & Package

The MAX9982ETP+T is housed in a 20-pin QFN package (5mm × 5mm) with exposed paddle for thermal and RF grounding. Pin layout follows standard QFN top-view numbering with pin 1 at top-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADL5350ACPZ-R7 and LT5527EUF#TRPBF, the MAX9982ETP+T uniquely combines GSM/CDMA band coverage, integrated baluns, and sub-250ns LO switching-making it the only option that satisfies all three requirements simultaneously in a single 20-pin QFN.

Availability

The MAX9982ETP+T is available at Aetrix Electronics and suitable for GSM base station receivers, CDMA infrastructure equipment, and microwave link designs requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.

Supply support for MAX9982ETP+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 communications, industrial, and automotive markets.

The MAX9982ETP+T belongs to Maxim's high-linearity RF mixer product line, designed specifically for cellular infrastructure applications demanding exceptional IP3, integrated functionality, and ruggedized packaging for outdoor deployment.

FAQ

What is the RF frequency range supported by the MAX9982ETP+T?

The MAX9982ETP+T supports an RF frequency range of 825MHz to 915MHz. This range fully covers GSM850, GSM900, and CDMA850 uplink bands. Operation outside this range is not characterized or guaranteed-designs must constrain RF input to these frequencies to ensure specified linearity, gain, and noise performance per the datasheet.

Does the MAX9982ETP+T require external baluns for RF or LO inputs?

No, the MAX9982ETP+T does not require external baluns. It integrates on-chip RF and LO baluns enabling true single-ended RF and LO drive. Only a 33pF DC-blocking capacitor is needed at each of RF, LO1, and LO2 inputs. This integration reduces bill-of-materials cost, PCB area, and insertion loss compared to discrete balun solutions.

How is LO port selection controlled on the MAX9982ETP+T?

LO port selection on the MAX9982ETP+T is controlled by the LOSEL pin (pin 8). Driving LOSEL HIGH selects LO1; driving it LOW selects LO2. The switching time from 50% LOSEL transition to IF settling within 2° phase error is under 250ns-meeting GSM frequency-hopping timing requirements. No external logic or delay circuitry is required.

What is the recommended bias configuration for the MAX9982ETP+T to achieve datasheet performance?

To achieve the datasheet-specified +26.8dBm input IP3 and 168mA supply current, connect a 249Ω ±1% resistor from the RFBIAS pin (pin 4) to ground. This sets the optimal quiescent bias point. Deviations from this value shift linearity and current draw-higher resistance lowers current and degrades IP3; lower resistance increases current and may compromise thermal stability.

Can the MAX9982ETP+T operate with a supply voltage other than 5V?

The MAX9982ETP+T is specified for 4.75V to 5.25V operation. While absolute maximum ratings allow up to 5.5V, operation outside the 4.75–5.25V range voids guaranteed performance-including conversion gain, IP3, and noise figure. System designs must regulate to this window; using unregulated 5V supplies with >±2.5% tolerance risks parametric deviation or reliability issues.

What is the function of the TAP pin on the MAX9982ETP+T?

The TAP pin (pin 2) provides access to the center tap of the internal RF balun. A bypass capacitor (typically 33pF) must be connected from TAP to ground within 100 mils to stabilize common-mode bias and suppress balun resonance. Omitting this capacitor causes degraded RF return loss and increased distortion-this connection is mandatory for all operating conditions.