+36-dBm IIP3 downconverting mixer provides 2.4-dB conversion gain

+36-dBm IIP3 downconverting mixer provides 2.4-dB conversion gain

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By eeNews Europe

The LTC5551 offers high linearity of +36 dBm IIP3, (input third-order intercept), and low 9.7 dB noise figure comparable to the highest IIP3 passive mixers available.

Unlike passive mixers which typically have 7 dB to 9 dB of conversion loss, the LTC5551 claims 2.4 dB of conversion gain, improving receiver dynamic range. The device also has broad RF frequency range capability, operating from 300 MHz to 3.5 GHz.

Additionally, passive mixers require high LO (local oscillator) drive to reach their claimed IIP3. The LTC5551 has an integrated LO buffer requiring only 0 dBm drive level, hence external circuitry and costs are minimized. By eliminating a high power LO signal in the users’ receiver, the device reduces a potential source of undesirable radiation to simplify filtering and RF shielding requirements.

The LTC5551 ensures robust radio performance with its high 1 dB compression point of +18 dBm. 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 3.3 V supply with current consumption of 204 mA, delivering its high performance with low power. If needed, the mixer also has a low power mode controlled via the ISEL pin. In this mode, current consumption drops by 30% to 142 mA, trading off the IIP3 slightly to +29.3 dBm.

The superior performance of the 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 mixer can be conveniently shut down with an enable control pin. When disabled, the IC draws a maximum of 100 µA standby current. The device turns on and off in 500 ns, suitable for burst-mode receivers. The LTC5551 is specified for operation from -40°C to 105°C case temperature. The mixer’s minimum external circuits and its 16-lead, 4 mm x 4 mm QFN package provide a highly compact solution footprint.

Availability and Pricing

The LTC5551 is priced starting at $7.25 each in 1,000-piece quantities. Production quantities are available immediately.

More information about the LTC5551 RF down-converting mixer at

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