May 14, 2012 – Linear Technology Korea (CEO Hong Sa-kwak) announced the release of a down-converting mixer (product name: LTC5567) with an operating frequency range of 300 MHz to 4 GHz. This product features excellent IIP3 (Input Third Order Intercept) performance of 26.9 dBm, low power consumption of 294 mW, and a wide IF bandwidth of 2.5 GHz to support 4G wireless base stations and various high dynamic range receiver applications.
The LTC5567's wide operating frequency range of 300 MHz to 4 GHz provides numerous functions in a single device, enabling operation in any cellular band from 700 MHz to 2.7 GHz. Featuring a conversion gain of 1.9 dB and a noise level of 11.8 dB, this mixer offers excellent dynamic range for various receiver applications. Furthermore, the LTC5567's IF output has a wide frequency range of 5 MHz to 2500 MHz, supporting broadband applications such as cable TV downlink transmitters and Digital Line Distortion (DPD) receivers. The LTC5567's RF input is designed to withstand strong in-band blocking signals, while simultaneously providing an industry-leading noise level of 16.5 dB with a +5 dBm blocker, thereby enhancing receiver sensitivity even in the presence of interference.
The RF balun transformer is integrated on the chip at both the RF and LO inputs, allowing the LTC5567 to operate as a single-ended unit with a 50Ω input impedance in the 1.4GHz to 3GHz range. Consequently, system cost and solution size can be reduced as only minimal external components are required. The 50Ω terminal at the LO input remains in place even when the device is powered off, ensuring that no load failure occurs when the device is turned on or off (in the event of a load failure, the phase-locked loop (PLL) of the VCO loop may unlock). The LO input includes a built-in buffer amplifier, requiring only a 0dBm drive level and providing excellent reverse RF blocking performance. As a result, the LTC5567 can be driven directly from an external VCO circuit, eliminating the need for an external buffer. Combined with all these features, the LTC5567 offers a cost-effective, space-efficient, and easy-to-design solution.
The LTC5567 offers a very compact solution footprint in a 4mm x 4mm QFN package. Furthermore, the LTC5567 is designed to operate at case temperatures ranging from -40°C to 105°C, ensuring reliability even in demanding environments. With a single 3.3V supply voltage and 89mA current consumption, the LTC5567 boasts the lowest power consumption in its class. Additionally, this mixer can be easily shut down via an enable control pin. When disabled, the IC consumes up to 100μA of leakage current. The LTC5567 starts at $6.50 per unit in 1,000-piece quantities. Samples and production units are available for purchase immediately. For product details, please visit www.linear.com/product/LTC5567 .

Photo caption: High-performance, low-power, wideband RF mixer

Product Features: LTC5567

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