SINGLE CHIP RDS DEMODULATOR FILTER
TDA7479
SINGLE CHIP RDS DEMODULATOR + FILTER
VERY HIGH RDS DEMODULATION QUALITY WITH IMPROVED DIGITAL SIGNAL PROCESSING ...
Description
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
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