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Date: 27-05-15

Wideband 3GHz to 8GHz mixer improves upconversion performance

The new LTC5576, an active double balanced upconversion mixer from Linear Technology work in wide 3GHz to 8GHz frequency range. LTC5576 delivers high linearity of 25dBm OIP3 and a conversion loss of 2dB at 8GHz so that the signal quality is high compared to passive mixers, which typically said to have 8dB of loss. Due to integrated buffer in LTC5576 which need only a 0dBm level drive no external amplifier circuit is required.

LTC5576 integrates RF balun transformer design to extend output frequency bandwidth while enabling single ended operation from 3GHz to 8GHz. LTC5576' IF input also offers wide bandwidth, and is continuous 50 ohms differential matched from 30MHz to over 3GHz. With a proper external balun transformer, the upper range can be extended to over 6GHz, suggests Linear.

The LTC5576 offers good port-to-port isolation due to active double balanced mixer core. Linear shares an example, where at 5.8GHz frequency and 0dBm LO input, the LO leakage at its RF output measures low 35dBm. All this resulting in lesser external filtering in order to meet regulatory outofband emission requirements. Even at 8GHz, its LO leakage stands out at 27dBm, as per Linear.

The LTC5576 targets applications such as short-range microwave backhauls, 5.8GHz cellular base stations and wireless repeaters.

Also due to its dynamic range, LTC5576 supports the performance requirements of wireless test equipment, radar receivers and satellite communications.

The LTC5576 features improved ESD rating of 2,500V human body model (HBM) on all pins.

The mixer is optimized for single 5V supply operation, with a nominal supply current of 99mA. Its power consumption can be reduced by powering from a 3.3V supply, with slightly reduced performance. Additionally, the LTC5576 has an enable pin to disable the IC, which when deactivated, draws only 1.3mA typical standby current. This enable pin can be used to turn the device on and off rapidly in less than 0.6μs, supporting time division duplex (TDD) or burst mode type radios.

Package: 4mm x 4mm QFN package
Temp rating: The device is rated for operation from 40°
C to 105°C case temperature to support extended environmental operating temperature.

Price: The LTC5576 is priced starting at $7.89 each in 1,000 piece quantities. Samples and production quantities are available immediately.

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