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.
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