MAX9988

Obsolete

+14dBm to +20dBm LO Buffers/Splitters with ±1dB Variation

Data Sheet (Rev. 2) Product Selection Table

Part Models: 2
1ku List Price: price unavailable

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Overview

±1dB Output Power Variation

+14dBm to +20dBm Adjustable Output Power

Two-Way Power Splitting

40dB Reverse Isolation

More than 30dB Output-to-Output Isolation

Low Output Noise: -170dBc/Hz at +17dBm

160mA Supply Current at +17dBm

Isolated PLL Output (+3dBm)

The MAX9987 and MAX9988 LO buffers/splitters each integrate a passive two-way power splitter with highisolation input and output buffer amplifiers. These buffers are designed to provide the high output (+14dBm to +20dBm) necessary to drive the LO inputs of high-linearity passive mixers, while offering 40dB reverse isolation to prevent LO pulling. The MAX9987 is internally matched for the cellular/GSM bands, and the MAX9988 is matched for the DCS/PCS/UMTS bands.

The typical application circuit provides a nominal +17dBm output power with ±1dB variation over supply, temperature, and input power. With two optional resistors, the output power can be precision set from +14dBm to +20dBm. The devices offer more than 30dB output-to-output port isolation, and are offered in 5mm x 5mm 20-pin thin QFN packages with exposed paddle.

Applications

Base-Station Main and Diversity Channels
Cellular/GSM/DCS/PCS/UMTS Base Station
Coherent Receivers
ISM Wireless LAN
Local Multipoint Distribution Service
Point-to-Point Systems
Tx/Rx LO Drive
Wireless Local Loop (WLL)

Part Models: 2
1ku List Price: price unavailable

Documentation

Data Sheet 1

MAX9987-MAX9988: +14dBm to +20dBm LO Buffers/Splitters with ±1dB Variation Data Sheet (Rev.2) 11/20/2002

Technical Articles 3

PCBs Layout Guidelines for RF & Mixed-Signal 09/14/2011

Simplifying Tomorrow's LO Drive Designs with the MAX9987-90 Family of LO Buffers/Splitters 03/06/2003

Silicon Germanium (SiGe) Technology Enhances Radio Front-End Performance 09/02/2002

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
MAX9988ETP+	20-LFCSP-5X5X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX9988ETP+T	20-LFCSP-5X5X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Oscillators 2
MAX9989	PRODUCTION	+14dBm to +20dBm LO Buffers with ±1dB Variation
MAX9990		+14dBm to +20dBm LO Buffers with ±1dB Variation

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