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.
Linear Technology
