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MAX9988：+14dBm to +20dBm LO Buffers/Splitters with ±1dB Variation

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.

Key Features ±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)

MAX9987, MAX9988: Typical Operating Circuit Applications/Uses 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)

DataSheet

Parametrics

Design kits & evaluation modules

• MAX9987EVKIT
• MAX9988EVKIT

Related Products

• MAX9989：+14dBm to +20dBm LO Buffers with ±1dB Variation
• MAX9990：+14dBm to +20dBm LO Buffers with ±1dB Variation

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