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Double-balanced mixer supports 2GHz to 14GHz

13 Aug 2015

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Linear Technology has rolled out a double-balanced mixer that can operate either as an upconverter or downconverter, with an RF range from 2GHz to 14GHz. The LTC5549 boasts 24.4dBm IIP3 linearity at 9GHz and claims to enable efficient microwave transmitter and receiver designs with an integrated LO buffer that needs only a 0dBm drive level, effectively eliminating an external high power LO amplifier circuit.

The LTC5549 has an integrated on-chip, switchable frequency doubler for LO signal, providing an option to use lower cost, commonly available low frequency synthesisers. The LTC5549 employs wideband integrated balun transformer optimized to extend RF frequency bandwidth while enabling single-ended operation. Its IF port also has wide bandwidth up to 6GHz. All three ports are 50Ω matched. The mixer offers high port-to-port isolation, minimising undesirable LO leakage and easing external filtering requirements.


The LTC5549 promises to boost the performance of various microwave applications such as microwave backhaul, high unlicensed band LTE-Advanced base stations, satellite broadband radios, radar systems, X-band and Ku band transceivers, test equipment and satellite modems.

The LTC5549 features 2kV ESD human body model (HBM) rating on all pins. The device is available in a 12-lead, 3mm x 2mm plastic QFN package. With its minimal external component design, the LTC5549 results in a compact solution footprint, stated the company.

The device is rated for operation from -40°C to 105°C case temperature to support extended environmental operating temperature. The mixer is optimised for single 3.3V supply operation, drawing a nominal supply current of 115mA. Additionally, the LTC5549 has an enable pin to disable the IC. When deactivated, the device draws only 100μA maximum standby current. The enable pin can be driven directly to turn the device on and off rapidly in less than 0.2μs, supporting TDD or burst mode type radios. The LTC5549 is priced starting at $9.50 each in 1,000-piece quantities. Samples and production quantities are available.

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