Linear Technology has announced the LTC5569, a dual RF mixer. With a wide operating frequency coverage to address high density footprints of multimode 4G RRH (remote radio head) MIMO (multiple-input, multiple-output) receivers, the new mixer has been designed to deliver impressive levels of performance:
- +26.8dBm IIP3 (input third order intercept)
- 300mW per mixer
- 300MHz to 4GHz frequency range
Linear Technology's designers intend for a single part to be configured to operate on any of the cellular bands from 700MHz to 2.7GHz. According to the company, the LTC5569 dual mixer provides best-in-class power consumption while delivering outstanding IIP3 with a conversion gain of 2dB and a noise figure of 11.7dB. This enables excellent dynamic range performance for both MIMO and diversity broadband receiver applications. In addition, the LTC5569 mixer can withstand strong in-band blocking interference signals without significantly degrading its noise figure, thus enhancing receiver sensitivity.
Each channel of the LTC5569 dual mixer contains an integrated balun transformer at the RF and LO inputs. These ports are single-ended 50Ohm matched, requiring minimal external components to save costs and reduce the solution footprint. Each channel’s LO has separate buffers driven from a common input. The LO input port is also single-ended, always 50Ohm matched regardless of whether the mixer is turned on or powered down. So turning on and off the channels will not induce load disturbance, avoiding unlocking of a PLL (phase-locked loop) and VCO circuit. The LO input requires 0dBm drive level and has excellent reverse RF isolation, so it can be driven directly from an external VCO circuit requiring no external buffer.
The dual mixer is housed in a 4mm x 4mm QFN package and is specified for case operating temperature from -40°C to 105°C. The LTC5569 operates from a single 3.3V supply, drawing a total supply current of 180mA when both channels are on. Each mixer can be independently shut down with a separate enable control. When disabled, the IC has a maximum of 200µA leakage current.
Availability & Price:
The LTC5569 is priced starting at $8.50 each in 1,000-pieces quantities. Samples and production quantities are available immediately.
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