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TDA7478 Datasheet(PDF) 1 Page - STMicroelectronics

Part No. TDA7478
Description  SINGLE CHIP RDS DEMODULATOR
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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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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