Features: 3.3V Operation for Reduced Power
50 Single-Ended RF and LO Ports
Wide RF Frequency Range: 400MHz to 3.8GHz*
High Input IP3: 25.6dBm at 900MHz
24.7dBm at 1950MHz
23.7dBm at 2.6GHz
Conversion Gain: 3.3dB at 900MHz
2.9dB at 1950MHz
3dBm LO Drive Level
Low LO Leakage
Low Noise Figure: 10.6dB at 900MHz
11.7dB at 1950MHz
Very Few External Components
16-Lead (4mm * 4mm) QFN PackageApplication Cellular, CDMA, WCDMA, TD-SCDMA and UMTS Infrastructure
WiMAX
Wireless Infrastructure Receiver
Wireless Infrastructure PA Linearization
900MHz/2.4GHz/3.5GHz WLANPinout
SpecificationsSupply Voltage (VCC1, VCC2, IF+, IF) ................... 4V
Enable Voltage ........................... 0.3V to VCC + 0.3V
LO Input Power (380MHz to 4.2GHz) ............. +10dBm
LO Input DC Voltage ........................ 1V to VCC + 1V
RF Input Power (400MHz to 3.8GHz) ............. +12dBm
RF Input DC Voltage ......................................... ±0.1V
Operating Temperature Range ..............40 to 85
Storage Temperature Range ...............65 to 125
Junction Temperature (TJ)................................... 125
CAUTION: This part is sensitive to electrostatic discharge (ESD). It is very important that proper ESD precautions be observed when handling the LT5557.
DescriptionThe LT®5557 active mixer is optimized for high linearity, wide dynamic range downconverter applications. The IC ncludes a high speed differential LO buffer amplifier driving a double-balanced mixer. Broadband, integrated ransformers on the RF and LO inputs provide singleended 50 interfaces. The differential IF output allows convenient interfacing to differential IF filters and amplifiers, or is easily matched to drive a single-ended 50 load, with or without an external transformer.
The RF input is internally matched to 50 from 1.6GHz to 2.3GHz, and the LO input is internally matched to 50 from GHz to 5GHz. The frequency range of both ports is easily extended with simple external matching. The IF output is artially matched and usable for IF frequencies up to 600MHz.
The LT5557's high level of integration minimizes the total solution cost, board space and system-level variation.
LT5557 Data Sheet
