MAX9989

19-2486; Rev 0; 7/02 www.DataSheet4U.com +14dBm to +20dBm LO Buffers with ±1dB Variation 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. 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 ✕ 5mm 20-pin thin QFN package with exposed paddle. o ±1dB Output Power Variation o +14dBm to +20dBm Adjustable Output Power o 40dB Reverse Isolation o Better Than 35dB Main Driver Output to PLL Amp Output Isolation o Low Output Noise: -170dBc/Hz at +17dBm o 110mA Supply Current at +17dBm o ESD Protection o Isolated PLL Output (+3dBm) Features MAX9989/MAX9990 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 PART Ordering Information TEMP RANGE PINPACKAGE 20 Thin QFN-EP* FREQUENCY RANGE (MHz) 700 to 1100 MAX9989ETP -40°C to +85°C MAX9990ETP -40°C to +85°C 20 QFN-EP* 1500 to 2200 *E...