Analog Devices Inc./Maxim Integrated MAX9982ETP+

Overview

The MAX9982ETP+ 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 enabling <250ns switching-deployed in cellular infrastructure front-ends where linearity, low noise, and fast frequency hopping are critical.

For engineers reviewing the MAX9982ETP+ datasheet, MAX9982ETP+ pinout, MAX9982ETP+ application, or MAX9982ETP+ equivalent, this page delivers verified technical context, package-aware design meaning, real-world RF/IF/LO frequency constraints, and validated alternative options for 2G/2.5G/CDMA base station receiver designs.

Technical Context

The MAX9982ETP+ implements a single-ended RF input (825–915MHz) and dual single-ended LO inputs (725–1085MHz), internally balanced via on-chip baluns. Its active SiGe BiCMOS architecture delivers net conversion gain while eliminating the need for a discrete IF amplifier stage.

LO selection is controlled digitally via LOSEL, toggling between LO1 and LO2 with sub-250ns settling time and >51dB isolation. The mixer supports both high-side and low-side injection, with IF output spanning 70–170MHz differential, requiring external pull-up inductors and resistors for proper termination and resonance.

Key Specifications

Pinout & Package

MAX9982ETP+ is housed in a 20-pin QFN-EP package (5mm × 5mm, 0.8mm height) with exposed thermal paddle for enhanced RF grounding and heat dissipation. Pin layout follows JEDEC MO220 standard; coplanarity ≤0.10mm; lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADL5360ACPZ-R7 and HMC774ALC3B, the MAX9982ETP+ uniquely combines GSM/CDMA band optimization, integrated baluns, and sub-250ns LO switching in a single 5mm × 5mm QFN - making it the only solution that simultaneously satisfies linearity, size, and frequency-hopping requirements in legacy cellular infrastructure.

Availability

MAX9982ETP+ is available at Aetrix Electronics and suitable for GSM base station receivers, CDMA infrastructure equipment, and microwave backhaul IF stages requiring stable component supply, long-term lifecycle support, and guaranteed traceability.

Supply support for MAX9982ETP+ 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 automotive markets.

The MAX9982ETP+ belongs to Maxim's high-linearity RF mixer product line, designed specifically for cellular infrastructure applications demanding exceptional IP3, low noise, and fast LO agility in compact form factors.

FAQ

What is the recommended LO drive level for MAX9982ETP+?

The MAX9982ETP+ accepts LO drive levels from -5dBm to +5dBm across its 725–1085MHz range. At 0dBm LO drive, typical conversion gain is +2.1dB (GSM band) and +2.6dB (Cellular band). Operating outside this range may degrade linearity or increase LO leakage; the device's integrated LO driver ensures stable performance across the full specified range without external amplification.

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

No. The MAX9982ETP+ integrates on-chip RF and LO baluns, enabling direct connection of single-ended 50Ω sources to RF, LO1, and LO2 pins. Only a 33pF DC-blocking capacitor is required at each port. This eliminates external transformer-based baluns, reducing insertion loss, board area, and impedance-matching sensitivity in production layouts.

How is the bias current set for MAX9982ETP+?

The MAX9982ETP+ bias current is set by connecting a precision 249Ω resistor from the RFBIAS pin (Pin 4) to ground. This yields a nominal supply current of 168mA and achieves the specified +26.8dBm input IP3. Deviating from 249Ω alters linearity and gain - e.g., 237Ω increases IIP3 slightly but raises ICC, while 261Ω reduces power consumption at the expense of IP3.

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

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 improve RF return loss. Leaving TAP floating degrades RF input match and increases second-harmonic distortion in the mixer's active core.

Can MAX9982ETP+ operate with high-side injection?

Yes. The MAX9982ETP+ supports both high-side and low-side injection configurations. For high-side injection, LO frequency equals RF + IF (e.g., RF = 870MHz, IF = 100MHz → LO = 970MHz). Conversion gain remains +2dB nominal, though noise figure rises to ~14.5dB and IIP3 drops ~0.5dB versus low-side injection - verified across 825–915MHz RF and 70–170MHz IF ranges.

What is the maximum allowable RF input power for MAX9982ETP+?

The absolute maximum RF input power for MAX9982ETP+ is +20dBm, per Absolute Maximum Ratings. However, for linear operation, RF input should be limited to ensure P1dB compression is not exceeded - typically ≤0dBm for optimal IIP3 and NF performance. Sustained input above +5dBm risks permanent degradation of SiGe transistor junctions, especially at elevated temperatures.