TDA7331

® TDA7331 SINGLE CHIP RDS DEMODULATOR + FILTER VERY HIGH RDS DEMODULATION QUALITY WITH IMPROVED DIGITAL SIGNAL PROC- ESSING HIGH PERFORMANCE, 57KHz BANDPASS FILTER (8th ORDER) PURELY DIGITAL RDS DEMODULATION WITHOUT EXTERNAL COMPONENTS ARI INDICATION AND RDS SIGNAL QUAL- ITY OUTPUTS 4.332MHz CRYSTAL OSCILLATOR (8.664 and 17.328MHz SELECTABLE OP- t(s)TIONS) LOW NOISE CMOS TECHNOLOGY cLOW RADIATION DIP20 SO20 ORDERING NUMBERS: TDA7331 TDA7331D roduDESCRIPTION PThe TDA7331, an improved version of TDA7330B, recovers the additional inaudible teRDS information which is transmitted by FM radio lebroadcasting stations and operates in accordoance with the EBU (European Broadcasting Unsion) specifications. bThe device is made up of two sections: a cas- OBLOCK DIAGRAM and TEST CIRCUIT caded 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. t(s) C1 27pF 4.332MHz C2 47pF roducMPX 270pF 1 lete P4 o FILOUT bs 16 O VS 2nd ORDER ANTIALIASING FILTER 8th ORDER SC-BANDPASS FILTER T57 11 OSCIN 10 OSCOUT 9 OSCILLATOR & DIVIDER 57KHz PLL FAST ARI INDICATOR 1187.5Hz PLL QUAL DET. 3 OSEL 18 FSEL 12 RDCL 15 ARI 14 QUAL 100nF 10µF VREF 2 + POLARITY BIPHASE DEC. 0 MUX 1 13 DIFF. DECODER RDDA INTEGRAL BIPHASE DEC. TES...