tda7479 STMicroelectronics, tda7479 Datasheet

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tda7479

Manufacturer Part Number
tda7479
Description
Single Chip Rds Demodulator Filter
Manufacturer
STMicroelectronics
Datasheet

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1
2
The TDA7479 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
December 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
ARI (SK INDICATION) AND RDS SIGNAL
QUALITY OUTPUT
4.332MHz CRYSTAL OSCILLATOR(8.664 and
17.328MHz OPTIONAL)
LOW NOISE CMOS TECHNOLOGY
LOW RADIATION
FEATURES
DESCRIPTION
MPX
100nF
V
10 µ F
S
270pF
FILOUT
VREF
4
8
12
3
GND
6
SINGLE CHIP RDS DEMODULATOR + FILTER
ANTIALIASING
+
-
2nd ORDER
SC-BANDPASS
8th ORDER
FILTER
FILTER
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.
Outputs for RDS signal quality and ARI indication are
also present.
Figure 1. Packages
Table 1. Order Codes
INDICATOR
57KHz PLL
POLARITY
INTEGRAL
FAST ARI
C1 27pF
OSCIN
Part Number
TDA7479AD
OSCILLATOR &
TDA7479D
4.332MHz
DIVIDER
13
SO16
0
1
C2 47pF
OSCOUT
14
MUX
EXTRES
QUAL DET.
11
1187.5Hz
DIFF. DECODER
PLL
TEST LOGIC
TDA7479
TSSOP16
TSSOP16
D97AU751A
Package
th
SO16
bandpass filter
16
10
5
9
7
1
2
OSEL
FSEL
RDCL
ARI
QUAL
RDDA
TM
Rev. 6
1/8

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tda7479 Summary of contents

Page 1

... CRYSTAL OSCILLATOR(8.664 and 17.328MHz OPTIONAL) ■ LOW NOISE CMOS TECHNOLOGY ■ LOW RADIATION 2 DESCRIPTION The TDA7479 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 4 MPX 270pF 8 ...

Page 2

... TDA7479 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 closed to GND=external driven 6 GND Ground 7 ARI Output for ARI indication: ...

Page 3

... (pull-up input 0.5mA 0.5mA L OSEL = open circuit OSEL = open circuit OSEL = open circuit OSEL = GND 4.332MHz OSEL = GND 8.664MHz OSEL = GND 17.328MHz TDA7479 Value Unit -0 - °C -55 to 150 °C Min. Typ. Max. Unit 4 ...

Page 4

... TDA7479 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 rising clock edge. (see Fig. 4)Whichever clock edge is used by the decoder (rising or falling edge) the data will remain valid for 416.7 µs after the clock transi- tion ...

Page 5

... Mold flash, protusions or gate burrs shall not exceed 0.15mm per side. inch MIN. TYP. MAX. 0.093 0.104 0.004 0.012 0.013 0.200 0.009 0.013 0.398 0.413 0.291 0.299 0.050 0.394 0.419 0.010 0.030 0.016 0.050 0.004 TDA7479 OUTLINE AND MECHANICAL DATA SO16 (Wide) 0016021 C 5/8 ...

Page 6

... TDA7479 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) 4.300 4.400 4.500 e 0.650 L 0.450 0.600 0.750 L1 1.000 k 0˚ (min.) 8˚ (max.) aaa 0 ...

Page 7

... Table 8. Revision History Date Revision September 2004 November 2004 2 December 2004 4 First Issue in EDOCS dms. 5 Add in the table 5 “RDS and ARI Detection Sensitivity” parameters. 6 Errata corrige of the Order Codes table. Description of Changes TDA7479 7/8 ...

Page 8

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