TDA7479
SINGLE CHIP RDS DEMODULATOR + FILTER
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.
BLOCK DIAGRAM AND TEST CIRCUIT
DIP16
SO16
ORDERING NUMBERS:
TDA7479
TDA7479D
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.
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
V
S
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
1/7
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