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Broadband RF mixer tips 26.9dBm IIP3 on 294mW

Posted: 16 May 2012 ?? ?Print Version ?Bookmark and Share

Keywords:broadband? RF mixer? LTC5567?

Linear Technology Corp. has introduced the LTC5567 broadband RF mixer. The 300MHz to 4GHz downconverting mixer achieves input third order intercept (IIP3) of 26.9dBm using 294mW. It features 2.5GHz IF bandwidth for 4G wireless base stations and high dynamic range receiver applications.

The device operates in any of the cellular bands from 700MHz to 2.7GHz, with a conversion gain of 1.9dB and a noise figure of 11.8dB. Its IF output has a wide frequency range of 5MHz to 2500MHz, supporting cable TV downlink transmitters, digital predistortion receivers, and other wideband applications. Also, the LTC5567's RF input is designed to withstand in-band blocking signals, while delivering a noise figure of 16.5dB with a +5dBm blocker, ensuring receiver sensitivity in the presence of interference.

RF balun transformers are integrated on-chip at the RF and LO inputs, enabling the LTC5567 to operate single-ended with 50 input impedance from 1.4GHz to 3GHz. Thus, minimum external components are needed, reducing system costs and solution size. Since the LO input's 50 termination remains even when the device is powered off, turning the device on and off will not introduce a load disturbance that can cause a PLL (phase-locked loop) with VCO loop to unlock. The LO input contains a built-in buffer amplifier, requiring only 0dBm drive level and providing excellent reverse RF isolation. As a result, the LTC5567 can be driven directly from an external VCO circuit, eliminating an external buffer. All of these features combine for a solution that is cost-effective, space efficient, and easy to design.

The device measures 4 x 4mm in a QFN package. Furthermore, the LTC5567 is specified for case temperature operation from -40C to 105C. With its single 3.3V supply, 89mA current consumption, the LTC5567 draws the lowest power in its class. Additionally, the mixer can be conveniently shut down with an enable control pin. When disabled, the IC draws a maximum of 100?A leakage current.

The LTC5567 is priced starting at $6.50 each in 1,000-piece quantities. Samples and production quantities are available immediately.

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