MAX2165 DMB-TH USB Dongle Reference Design

Abstract: This compact USB dongle design combines a MAX2165 direct-conversion tuner and a DMB-TH demodulator. The design converts a UHF signal (470MHz to 858MHz) to a MPEG-2 transport stream. Then the USB interface enables video viewing on a laptop or desktop computer. More detailed image (PDF, 232kB)

Lab Measurements

This DMB-TH receiver reference design includes the MAX2165 direct-conversion tuner, a DMB-TH demodulator, and USB interface circuitry. This solution is intended for handheld or laptop computer-based digital video broadcast applications in the Chinese market. The design covers the 470MHz to 858MHz UHF band.The MAX2165 direct-conversion architecture eliminates the need for an IF-SAW filter. Programmable baseband channel-selection filters allow for operation with 7MHz and 8MHz channels. The fractional-N synthesizer reduces VCO lock time and minimizes close-in phase noise, thus eliminating the need for power-hungry, phase-noise reduction algorithms.The DMB-TH demodulator accepts I/Q inputs from the tuner and supplies a MPEG-2 transport stream to the USB chip. The USB chip enables interfacing with a laptop or desktop computer for viewing broadcast video and for lab analysis.