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E-TDA7478AD Folha de dados(PDF) 1 Page - STMicroelectronics |
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E-TDA7478AD Folha de dados(HTML) 1 Page - STMicroelectronics |
1 / 8 page 1/8 TDA7478 November 2004 1 FEATURES ■ 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 ■ RDS SIGNAL QUALITY OUTPUT ■ 4.332MHz CRYSTAL OSCILLATOR(8.664MHz OPTIONAL) ■ LOW NOISE CMOS TECHNOLOGY ■ LOW RADIATION 2 DESCRIPTION The TDA7478 recovers the additional inaudible RDS information which is transmitted by FM radio broad- casting stations and operates in accordance with the EBU (European Broadcasting Union) specifications. The device is made up of two sections: a cascaded antialiasing + switched capacitors 8th 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 further pro- cessed by a suitable RDS decoder. Output for RDS signal quality is also present. SINGLE CHIP RDS DEMODULATOR Figure 2. Block Diagram 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 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 D03AU1490 TM 10 RDDA 2 QUAL N.U. RDCL FSEL OSEL OSCOUT OSCIN 4.332MHz C2 47pF C1 27pF 15 T57 Figure 1. Packages Table 1. Order Codes Part Number Package TDA7478D SO16 E-TDA7478AD TSSOP16 SO16 TSSOP16 Rev. 2 |
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