Mixer Dual
LTC5569 Released by Linear Technology Corp
Recently, Linear Technology Corporation has announced LTC5569, a dual high performance RF mixer. In order to satisfy high density footprints of multimode 4G RRH (Remote Radio Head) MIMO (Multiple-Input, Multiple-Output) receivers, the LTC5569 combines 26.8dBm IIP3 (Input Third Order Intercept), 300mW per mixer, together with wide operating frequency coverage. Since the operating range for this mixer is from 300MHz to 4GHz, just a single part can work on any of the cellular bands from 700MHz to 2.7GHz. While delivering excellent IIP3 with a conversion gain of 2dB as well as a noise figure of 11.7dB, the
LTC5569
provides best-in-class power consumption, which helps MIMO and various broadband receiver applications realize outstanding dynamic range performance. Besides these, with the robust inputs, the LTC5569 can withstand strong in-band blocking interference signals without degrading its noise figure significantly, which can improve receiver sensitivity.
Meanwhile, the LTC5560, a dual symmetrical active downconverting mixer, has separate baluns on both RF and LO inputs. These ports, exactly matching for 50Ω, need the least external parts, which could save costs and space for solving solutions. Each LO has single buffer with common input, providing the excellent space between the channels. LO offers single-ended inputs with simple external matching for 50Ω, no matter the mixer is on or off. Therefore, whether connecting or disconnecting channels, it will not cause loading interference, avoiding PPL (phase lock loop) and VCO circuit unlock. LO input only needs 0dBm level drive, having excellent reverse RF isolation, thus, it can adopt an external VCO circuit driver without external buffer. All these functions enhance this useful solution with the minimum external components.
The LTC5569, double channel mixer with low power and the compact solution, is the optimization model for the new 4G generation pattern receivers. With frequency 300mW every channel, it release the cooling challenge of MIMO RRH design. Meanwhile, this mixer need the least external components, with 4mm x 4mm QFN package, it provides highly compact space solution. Additionally, LTC5569 model can operate in the temperature range from -40°C to 105°C, still reliability in the harsh environment.
LTC5569 operates under the 3.3V low power. With the two channels put on, it absorbs 180mA total current. Each mixer can control independent halt separately. What’s more, being out of service, the IC’s leakage current is about 200 uA. Furthermore, the LTC5569 is on production and the samples are providing now. As for its price, it is priced at $8.5 in 1000-piece lots.
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