LT5557

LT5557 400MHz to 3.8GHz 3.3V Active Downconverting Mixer Features n Wide RF Frequency Range: 400MHz to 3.8GHz* n High Input IP3: 25.6dBm at 900MHz 24.7dBm at 1950MHz 23.7dBm at 2.6GHz n Conversion Gain: 3.3dB at 900MHz 2.9dB at 1950MHz n –3dBm LO Drive Level n Low LO Leakage n Low Noise Figure: 10.6dB at 900MHz 11.7dB at 1950MHz n Low Power: 3.3V/269mW n 50Ω Single-Ended RF and LO Ports n Very Few External Components n 16-Lead (4mm × 4mm) QFN Package Applications n Cellular, CDMA, WCDMA, TD-SCDMA and UMTS Infrastructure n WiMAX n Wireless Infrastructure Receiver n Wireless Infrastructure PA Linearization n 900MHz/2.4GHz/3.5GHz WLAN Description The LT®5557 active mixer is optimized for high linearity, wide dynamic range downconverter applications. The IC includes a high speed differential LO buffer amplifier driving a double-balanced mixer. Broadband, integrated transformers on the RF and LO inputs provide single-ended 50Ω interfaces. The differential IF output allows convenient interfacing to differential IF filters and amplifiers, or is easily matched to drive a single-ended 50Ω load, with or without an external transformer. The RF input is internally matched to 50Ω from 1.6GHz to 2.3GHz, and the LO input is internally matched to 50Ω from 1GHz to 5GHz. The frequency range of both ports is easily extended with simple external matching. The IF output is partially matched and usable for IF frequencies up to 600MHz. The LT5557’s high level ...