TDA7478D STMicroelectronics, TDA7478D Datasheet

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TDA7478D

Manufacturer Part Number
TDA7478D
Description
Manufacturer
STMicroelectronics
Datasheet

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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
November 2004
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
MPX
FEATURES
DESCRIPTION
100nF
V
10µF
S
270pF
FILOUT
VREF
4
8
12
3
GND
6
ANTIALIASING
+
-
2nd ORDER
SC-BANDPASS
FILTER
8th ORDER
FILTER
SINGLE CHIP RDS DEMODULATOR
15
T57
BIPHASE DEC.
BIPHASE DEC.
EBU (European Broadcasting Union) specifications.
The device is made up of two sections: a cascaded
antialiasing + switched capacitors 8
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.
Figure 1. Packages
Table 1. Order Codes
57KHz PLL
POLARITY
INTEGRAL
C1 27pF
OSCIN
E-TDA7478AD
Part Number
OSCILLATOR &
TDA7478D
4.332MHz
DIVIDER
13
SO16
0
1
C2 47pF
OSCOUT
14
MUX
EXTRES
QUAL DET.
11
1187.5Hz
DIFF. DECODER
PLL
TEST LOGIC
TDA7478
TSSOP16
TSSOP16
Package
th
D03AU1490
SO16
bandpass filter
16
10
5
9
7
1
2
OSEL
FSEL
RDCL
N.U.
QUAL
RDDA
TM
Rev. 2
1/8

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TDA7478D Summary of contents

Page 1

... ORDER ANTIALIASING FILTER 8th ORDER 57KHz PLL SC-BANDPASS FILTER - POLARITY BIPHASE DEC. + INTEGRAL BIPHASE DEC. TDA7478 SO16 TSSOP16 Part Number Package TDA7478D E-TDA7478AD TSSOP16 th 4.332MHz C2 47pF OSCOUT 13 14 OSCILLATOR & DIVIDER 1187.5Hz PLL QUAL DET. 0 MUX DIFF. DECODER 1 TEST LOGIC ...

Page 2

TDA7478 Table 2. Pin Description No pin Name 1 QUAL Output for signal quality indication (High = good) 2 RDDA RDS data output 3 VREF Reference voltage 4 MPX RDS input signal 5 OSEL Oscillator selector pin: - open, closed ...

Page 3

Table 4. Absolute Maximum Ratings Symbol V Supply Voltage S T Operating Temperature Range op T Storage Temperature stg Table 5. Electrical Characteristcs (T = 25° 5V, unless otherwise specified) amb S Symbol Parameter V Supply voltage S ...

Page 4

TDA7478 Figure 4. RDS timing diagram 3 OUTPUT TIMING The RDS (1187.5Hz) output clock on RDCL line is synchronized to the incoming data. According to the internal PLL lock condition data change can result on the falling or on the ...

Page 5

Figure 5. SO16 Mechanical Data & Package Dimensions mm DIM. MIN. TYP. MAX. A 2.35 2.65 A1 0.10 0.30 B 0.33 0.51 C 0.23 0.32 (1) 10.10 10. 7.40 7.60 e 1.27 H 10.0 10.65 h 0.25 0.75 ...

Page 6

TDA7478 Figure 6. TSSOP16 Mechanical Data & Package Dimensions mm DIM. MIN. TYP. MAX. A 1.200 A1 0.050 0.150 A2 0.800 1.000 1.050 b 0.190 0.300 c 0.090 0.200 D (1) 4.900 5.000 5.100 E 6.200 6.400 6.600 E1 (1) ...

Page 7

Table 8. Revision History Date Revision July 2004 November 2004 1 First Issue 2 Add in the table 5 “RDS and ARI Detection Sensitivity” parameters. Description of Changes TDA7478 7/8 ...

Page 8

... No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics ...

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