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TDA7479 Arkusz danych(PDF) 1 Page - STMicroelectronics |
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TDA7479 Arkusz danych(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) 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 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 4 270pF - + 8 FILOUT 12 VS 3 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. 6 GND 11 EXTRES 14 13 5 9 16 7 1 D97AU751A TM 10 RDDA 2 QUAL ARI RDCL FSEL OSEL OSCOUT OSCIN 4.332MHz C2 47pF C1 27pF 15 T57 BLOCK DIAGRAM AND TEST CIRCUIT TDA7479 SINGLE CHIP RDS DEMODULATOR + FILTER DIP16 SO16 ORDERING NUMBERS: TDA7479 TDA7479D 1/7 |
Podobny numer części - TDA7479 |
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