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

The MAX9989 and MAX9990 LO buffers 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 MAX9989 is internally matched for the cellular/GSM bands, and the MAX9990 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 35dB main driver output to PLL amp output isolation. Each device is offered in a 5mm x 5mm 20-pin thin QFN package with exposed paddle.

Key Features ±1dB Output Power Variation +14dBm to +20dBm Adjustable Output Power 40dB Reverse Isolation Better Than 35dB Main Driver Output to PLL Amp Output Isolation Low Output Noise: -170dBc/Hz at +17dBm 110mA Supply Current at +17dBm ESD Protection Isolated PLL Output (+3dBm)

MAX9989, MAX9990: Typical Operating Circuit Applications/Uses Cellular/GSM/DCS/PCS/UMTS Base Station Tx/Rx LO Drive Coherent Receivers ISM Wireless LAN Local Multipoint Distribution Service Point-to-Point Systems Wireless Local Loop (WLL)

DataSheet

Parametrics

Design kits & evaluation modules

• MAX9989EVKIT
• MAX9990EVKIT

Related Products

• MAX9987：+14dBm to +20dBm LO Buffers/Splitters with ±1dB Variation
• MAX9988：+14dBm to +20dBm LO Buffers/Splitters with ±1dB Variation

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