The LTC5566 dual mixer has a 300MHz to 6GHz input frequency range, and so covers the emerging 3.6GHz and 4.5GHz 5G mobile bands, as well as the established 4G bands.
It supports bandwidths up to 400MHz to meet the needs of the growing sub-6GHz 5G wireless access equipment.
The mixer’s dynamic range is specified at an input P1dB of +11.5dBm and input IP3 of +25.5dBm at 3.6GHz.
At higher frequencies, up to 5.8GHz, its IIP3 sustains more than +24dBm.
According to the supplier, the device’s integrated IF amplifier boosts the overall power conversion gain to a maximum of 12dB.
The gain of each channel is independently programmed in precise 0.5dB steps via the on-chip SPI bus. So, with each channel driving an A/D converter, the fine gain control provides a simple means to balance the gain of the two channels and calibrate to the optimum level with minimal external components.
The mixer has a double-balanced mixer core which optimises conversion loss and provides the port-to-port isolation. Each mixer input includes an integrated wideband balun transformer, allowing a simple single-ended interface.
Using the SPI or parallel pins, the mixer inputs can be digitally tuned for optimum return loss over several wide, overlapping frequency bands, ranging from 1.3GHz to 5.3GHz.