TDA7479

TDA7479 SINGLE CHIP RDS DEMODULATOR + FILTER VERY HIGH RDS DEMODULATION QUALITY WITH IMPROVED DIGITAL SIGNAL PROCESSING HIGH PERFORMANCE, 57KHz BANDPASS FILTER (8th ORDER) FILTER ADJUSTMENT FREE AND WITHOUT EXTERNAL COMPONENTS PURELY DIGITAL RDS DEMODULATION WITHOUT EXTERNAL COMPONENTS ARI (SK INDICATION) AND RDS SIGNAL QUALITY OUTPUT 4.332MHz CRYSTAL OSCILLATOR (8.664 and 17.328MHz OPTIONAL) LOW NOISE CMOS TECHNOLOGY LOW RADIATION DESCRIPTION The TDA7479 recovers the additional inaudible RDS information which is transmitted by FM radio broadcasting stations and operates in accordance with the EBU (European Broadcasting Union) specifications. BLOCK DIAGRAM AND TEST CIRCUIT DIP16 SO16 ORDERING NUMBERS: TDA7479 TDA7479D The device is made up of two sections: a cascaded antialiasing + switched capacitors bandpass filter for precise RDS band selection and a demodulating section that performs the extraction od RDS data stream (RDDA) and clock (RDCL), to be furher processed by a suitable RDS decoder. Outputs for RDS signal quality and ARI indication are also present. C1 27pF 4.332MHz C2 47pF T57 15 4 270pF 2nd ORDER ANTIALIASING FILTER OSCIN 13 OSCOUT 14 MPX 5 OSCILLATOR & DIVIDER 9 OSEL FSEL 16 FILOUT 8 8th ORDER SC-BANDPASS FILTER 57KHz PLL 1187.5Hz PLL 7 1 VS 100nF VREF 10µF INTEGRAL BIPHASE DEC. 3 + POLARITY BIPHASE DEC. 0 1 10 TEST LOGIC 2 12 FAST ARI INDICATOR QUAL DET. RDCL ARI QUAL MUX DIFF. DECODER RDDA TM 6 GND 11 EXTRES D97AU751A February 1998 1/7...