Linear Technology DC426B Manuals

1 of 10 DC426B DEMO BOARD QUICK START GUIDE Description: The DC426B demo circuit board is intended to demonstrate the capabilities of the LT5511 high signal level upconverting mixer IC for 1900MHz infrastructure applications. The LT5511 mixer IC is designed to meet the high linearity requirements of cable TV infrastructure downstream transmitters and wireless infrastructure transmit systems. The IC includes a differential LO buffer amplifier driving a double-balanced mixer. The LO, RF and IF ports can be easily matched to a broad range of frequencies for different applications. The high performance capability of the LO buffer allows the use of a single-ended source, thus eliminating the need for an LO balun. The LT5511 mixer delivers +17dBm typical input 3rd order intercept at 950MHz, and +15.5dBm IIP3 at 1900MHz, with IF input signal levels of –5dBm. The input 1dB compression point is typically +6dBm. The DC426B demo board is optimized to upconvert a 50MHz IF input to 1900MHz RF output with the LO injected from the high-side at 1950MHz. Figure 1. LT5511 IC Block Diagram LO BUFFER LO- LO+ NC IF- IF+ GND GND VCCBIAS BIAS CIRCUITS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 RF- RF+ NC GND GND (BACKSIDE) GND GND EN VCCLO