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TDA7331 Datasheet(PDF) 1 Page - STMicroelectronics |
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TDA7331 Datasheet(HTML) 1 Page - STMicroelectronics |
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1 / 7 page  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- TIONS) LOW NOISE CMOS TECHNOLOGY LOW RADIATION DESCRIPTION The TDA7331, an improved version of TDA7330B, recovers the additional inaudible RDS information which is transmitted by FM radio broadcasting stations and operates in accord- ance with the EBU (European Broadcasting Un- ion) specifications. The device is made up of two sections: a cas- caded antialiasing + switched capacitors band- pass 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 de- coder. Outputs for RDS signal quality and ARI indication are also present. February 1998 2nd ORDER ANTIALIASING FILTER 8th ORDER SC-BANDPASS FILTER MPX 1 270pF - + 4 FILOUT 16 VS 2 VREF 100nF 10 µF OSCILLATOR & DIVIDER 57KHz PLL FAST ARI INDICATOR POLARITY BIPHASE DEC. INTEGRAL BIPHASE DEC. 1187.5Hz PLL MUX 0 1 DIFF. DECODER TEST LOGIC QUAL DET. 5 GND N.C. 6,7,8,17 20 EXTRES 9 10 3 18 12 15 14 D97AU686B TM 19 RDDA 13 QUAL ARI RDCL FSEL OSEL OSCOUT OSCIN 4.332MHz C2 47pF C1 27pF 11 T57 BLOCK DIAGRAM and TEST CIRCUIT TDA7331 SINGLE CHIP RDS DEMODULATOR + FILTER DIP20 SO20 ORDERING NUMBERS: TDA7331 TDA7331D 1/7 |
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