300MHz to 4GHz 3.3V Dual Active Downconverting Mixer

The LTC5569 dual active downconverting mixer is optimized for diversity and MIMO receiver applications that require low power and small size. Each mixer includes an independent LO buffer amplifier, active mixer core, and bias circuit with enable pin. The symmetry of the IC assures that a phase and amplitude coherent LO is applied to each mixer.

The RF inputs are 50Ω matched from 1.4GHz to 3.3GHz, and easily matched for higher or lower RF frequencies with simple external matching. The LO input is 50Ω matched from 1GHz to 3.5GHz, even when one or both mixers are disabled. The LO input is easily matched for higher or lower frequencies, as low as 350MHz, with simple external matching. The low capacitance differential IF outputs are usable up to 1.6GHz.

Applications

* Wireless Infrastructure Diversity Receivers

* MIMO Infrastructure Receivers

* Remote Radio Units

* High IIP3: 26.8dBm at 1950MHz* 2dB Conversion Gain* Low Noise Figure: 11.7dB at 1950MHz* 17dB NF Under 5dBm Blocking* 44dB Channel Isolation* Low Power: 3.3V/600mW Total* Very Small Solution Size* Enable Pins for Each Mixer* Wide IF Frequency Range* LO Input 50Ω Matched in All Modes* –40°C to 105°C Operation* 16-Lead (4mm × 4mm) QFN package