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TDA7478 Datasheet

  • TDA7478

  • SINGLE CHIP RDS DEMODULATOR

  • 8頁

  • STMICROELECTRONICS   STMICROELECTRONICS

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TDA7478
SINGLE CHIP RDS DEMODULATOR
1
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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
Figure 1. Packages
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SO16
TSSOP16
Table 1. Order Codes
Part Number
TDA7478D
E-TDA7478AD
Package
SO16
TSSOP16
EBU (European Broadcasting Union) specifications.
The device is made up of two sections: a cascaded
antialiasing + switched capacitors 8
th
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.
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
Figure 2. Block Diagram
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
10碌F
INTEGRAL
BIPHASE DEC.
3
-
+
POLARITY
BIPHASE DEC.
0
1
2
12
QUAL DET.
RDCL
N.U.
QUAL
MUX
DIFF. DECODER
RDDA
10
TEST LOGIC
TM
6
GND
11
EXTRES
D03AU1490
November 2004
Rev. 2
1/8

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