General Description
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.

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)

Applications
    Cellular/GSM/DCS/PCS/UMTS Base Station Tx/Rx LO Drives
    Coherent Receivers
    ISM Wireless LAN
    Wireless Local Loop
    Local Multipoint Distribution Service
    Point-to-Point Systems