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TDA7331 Datasheet(PDF) 1 Page - STMicroelectronics

Part No. TDA7331
Description  SINGLE CHIP RDS DEMODULATOR FILTER
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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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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