RDS demodulator with integrated filter

The RDS (Radio Data System) demodulator described in the May 1989 issue is based on the SAF7579T, and has an external 4-section 57-kHz bandpass filter ahead of it that is not easy to adjust. A follow-up type of the SAF7559T, the SAA6579T, has an on-chip pre-aligned RDS filter, which eliminates any adjustment.