Demonstration circuit 2460A is optimized for evaluation of the LTC5566 dual programmable gain downconverting mixer. Each channel incorporates an active mixer and a digital IF VGA with 15.5dB gain control range. The IF gain of each channel is independently programmable through the SPI in 0.5dB steps. Its single-ended RF ports are tunable via the SPI or parallel control lines and have a range from 300MHz to 6GHz. The LO port is always matched to 50Ω from 150MHz to 6GHz with 10dB return loss. The differential IF port is usable from 1MHz to 500MHz. There is a reduced power mode available through the SPI, which lowers the total current consumption by 25%.