Double-Balanced Mixer Cruises 3 to 20 GHz Space

In a 3 mm x 2 mm package, the LTC5552 double balanced mixer features wideband matching from 3 GHz to 20 GHz. It can be used as an up- or downconverter and shines in up-conversion applications with its DC capable differential IF port that enables the LO to be close in frequency to the RF. The device exhibits LO to RF leakage of less than –25 dBm, which greatly eases the burden on the external filter. Additionally, the mixer delivers a linearity of 20.1 dBm IIP3 at 14 GHz, and 18.3 dBm at 17 GHz. The device integrates a broadband LO buffer, requiring only 0dBm drive and effectively eliminating an external high power LO amplifier circuit. Moreover, the LTC5552 integrates a wideband balun transformer in its RF port, allowing single-ended 50Ω matched operation over its specified frequency range. 


The LTC5552 is offered in a tiny 12-lead, 3mm x 2mm plastic QFN package. The device is rated from -40°C to +105°C case temperature to support extended environmental operating temperatures. The mixer is powered from a single 3.3V supply and typically consumes 132mA supply current. Additionally, the LTC5552 can be shut down via an enable pin. When deactivated, the device draws only 100 μA maximum standby current. The enable pin can also be driven directly to turn the device on and off rapidly in less than 0.2μs, supporting time-division duplex (TDD) or burst mode type transmitters and receivers. The LTC5552 is priced starting at $22.00 each in 1,000-piece quantities. More information and a datasheet are available.


Linear Technology Corp.

Milpitas, CA.