The LTC5551 is an ultrahigh dynamic range RF down-converting mixer for applications that demand the very best in performance. The LTC5551 offers very high linearity of +36dBm IIP3, (input third-order intercept), and low 9.7dB noise figure comparable to the highest IIP3 passive mixers available. Unlike passive mixers which typically have 7dB to 9dB of conversion loss, the LTC5551 boasts 2.4dB of conversion gain, substantially improving receiver dynamic range. The device also has broad RF frequency range capability, operating from 300MHz to 3.5GHz.Additionally, passive mixers require high LO (local oscillator) drive to reach their claimed IIP3. The LTC5551 has an integrated LO buffer requiring only 0dBm drive level, hence external circuitry and costs are minimized. And with the elimination of a high power LO signal in the users' receiver, it substantially reduces a potential source of undesirable radiation, thus simplifying filtering and RF shielding requirements.The LTC5551 ensures robust radio performance with its high 1dB compression point of +18dBm. Both the RF and LO inputs have integrated balun transformers, further reducing cost and external components while simplifying the design task. The mixer is powered from a single 3.3V supply with current consumption of 204mA, delivering its high performance with exceptionally low power. The superior performance of this mixer is ideally suited for a wide range of mission-critical, high performance applications that are exposed to strong interference sources such as multi-carrier GSM, 4G LTE and LTE-Advanced multimode basestations, point-to-point backhauls, military communications, wireless repeaters, public safety radios, VHF/UHF/white-space broadcast receivers, radar and avionics.The LTC5551 comes in a 4mm x 4mm QFN that is specified over -40°C to 105°C and is priced starting at $7.25 each in 1,000-piece quantities.
