July 11th, 2010
Silicon Laboratories... DTV Combo Solution (SatBroadcastingDemodulator)
Today's iDTV and STB makers rely on multiple demodulators to enable satellite (DVB-S/S2), terrestrial (DVB-T), and cable (DVB-C) reception in a single system. This approach adds cost and complexity to the system design. By supporting DVB-T/C/S/S2 in a single device, the Si2167 eliminates the need for multiple demodulators and greatly simplifies both hardware and software design. The Si2167 IC's DVB-T/C core is an enhanced and field-proven version of the Si2165 IC core, a market-leading terrestrial and cable demodulator that has shipped in high volumes during the last two years. Available in a tiny 48-pin 7 mm x 7 mm QFN package, the Si2167 IC enables the industry's smallest demodulator footprint for a DVB-S/S2 demodulator despite the inherent complexity of the DVB-S2 standard. Additionally, embedding DVB-T/C into the same device provides a space-saving multimedia demodulator solution that dramatically reduces PCB area, which is an important consideration for NIM manufacturers and systems with multiple front-end designs. The lower pin count simplifies the design process and significantly reduces the overall electrical component bill of material.
The Si2167 supports a seamless interface to Silicon Labs Si217x hybrid silicon tuner. Additionally, the Si2167's flexible terrestrial and cable intermediate frequency (standard and low IF) interface is also compatible with any standard mixer oscillator phase-locked loop (MOPLL) based metal can tuners. For DVB-S/S2 applications, the Si2167 supports common Zero IF (ZIF) tuner solutions by integrating two dedicated on-chip analog-to-digital converters. The Si2167 IC's power dissipation is less than 200 mW in DVB-T/C reception mode, and it also ranges from 450 to 860 mW depending on the DVB-S2 mode and actual field reception conditions. These figures represent significant power savings compared with legacy solutions, which helps minimize overheating inside the module or the equipment cabinet. The Si2167 IC's on-chip oscillator/PLL circuit enables the demodulator to be driven by the tuner's clock sources, eliminating the need for a dedicated crystal for the demodulator.