+36dBm IIP3 down-converting mixer features 2.4dB conversion gain
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, says the manufacturer. 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. If needed, the mixer also has a low power mode controlled via the ISEL pin. In this mode, current consumption drops by 30% to 142mA, trading off the IIP3 slightly to +29.3dBm.
The mixer can be conveniently shut down with an enable control pin. When disabled, the IC draws a maximum of 100µA standby current. The device turns on and off in 500ns, suitable for burst-mode receivers. The LTC5551 is specified for operation from -40°C to 105°C case temperature, it comes in a 16-lead, 4x4mm QFN package.
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