Broadcast audio ICs offer ‘unmatched’ integration in cmos

According to the mixed signal/analogue specialist, the Si484x receivers are based on a patented low IF digital architecture and offer 'unmatched' integration in cmos, reducing radio component count by more than 70%. SiLabs claims the new receivers shrink bill of materials and pcb area requirements in any consumer electronics containing a digital display radio tuned by a mechanical wheel. The receivers have been designed to resolve a design challenge for the market. Competitive solutions use frequency counter ICs to approximate the tuned frequency of traditional analogue ICs. With this approach, the actual tuned frequency could be significantly different from the displayed frequency, leading to problems with tuning for radio users. According to SiLabs, the Si484x family provides precise mechanical tuning that enables radio users to hear the exact channel that is being displayed. SiLabs adds that the devices deliver 'unsurpassed' rf performance in the worldwide AM/FM/SW bands, as well as audio features that are 'unmatched' by competing radio ICs. The Si484x receivers' automatically tuned rf front end circuitry adjusts to reject noise and amplify the target signal for exceptional sensitivity in weak signal conditions. In crowded broadcast environments, the rf front end automatically attenuates undesired blockers and receives the audio signals on the desired channel with high signal quality. The receivers are said to provide advanced audio conditioning for all signal environments, removing pops, clicks and loud static in variable signal conditions. The ICs also enable display indicators for valid stations, mono/stereo signals and tuned frequency. Additional unique audio features include digital volume control, soft mute and bass/treble audio control. "Radio designs based on the new Si484x receivers require no manually tuned components, enabling radio makers to eliminate costly manual placement, testing and tuning in their manufacturing lines, thereby reducing labour cost while improving capacity, yield and time to market," said Diwakar Vishakhadatta, general manager of Silicon Labs' broadcast audio products. "Silicon Labs' Si484x receivers provide radio makers with a highly integrated multiband receiver solution with unprecedented flexibility, simplifying design and manufacturing for a broad range of wheel tuned, digital display radio products."