The Si475x products are feature-rich solutions, providing excellent performance with Silicon Labs' recommended default settings, coupled with extensive flexibility to customize audio and system performance according to customer’s preferences. Programmable algorithms include advanced seek with multiple signal qualifiers and thresholds in all supported bands and a comprehensive suite of weak signal processing engines including FM stereo-mono blend with programmable rates and thresholds, soft mute, AM/FM noise impulse blankers, dynamic AM/FM channel bandwidth control, dynamic AM/FM hi-cut audio filtering, FM hi-blend audio filtering, and AM lo-cut filtering for 50/60Hz power line suppression.
The Si475x generates all internal clocking from an external crystal using an on-chip oscillator, or an external programmable reference clock. The supported crystal and external clock source frequency is 4 MHz. The IC provides audio output in standard line-level analog audio using high fidelity stereo DACs. FM MPX analog output is provided for interface to third party VICS decoders for the Japanese market.
All odd numbered Si475x parts offer a fully-integrated preprocessor for the European Radio Data System and the North American Radio Broadcast Data System (RDS). The RDS preprocessor includes all symbol decoding, advanced error-correction, detailed visibility to block-error rates (BLER), synchronization status and times, and complete, decoded and error-corrected RDS group data.