GENERAL DESCRIPTION
THE OUTLINE OF RDS(RADIO DATA SYSTEM)
Since 1988 most European national broadcaststations transmit RDS-code beside their audio signals. RDS means Radio Data System and was originally intended to give people in their cars additional information about the weather or traffic(jams). But RDS has grown out to one big channel of information. Radiostations send their name, the time (with DCF-77 accuracy), their type of music (format) and even more. The digital data of RDS are multiplexed into an FM radio wave using a sub-carrier of 57kHz. The transmission rate of RDS data is 1.1875kbit/sec.

FEATURES
• Low Current
• Two Stage Anti-aliasing Filter
• 8th 57kHz Switched Capacitor Bandpass Filter
• DSB Demodulation (Carrier Recovery)
• Clock Recovery Circuit
• Biphase Decoder & Differential Decoder
• Quality Indication Output for Demodulated Data