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E-TDA7478AD Schematic ( Datenblatt PDF ) - STMicroelectronics

Teilenummer E-TDA7478AD
Beschreibung SINGLE CHIP RDS DEMODULATOR
Hersteller STMicroelectronics
Logo STMicroelectronics Logo 

Gesamt 8 Seiten
		
E-TDA7478AD Datasheet, Funktion
TDA7478
SINGLE CHIP RDS DEMODULATOR
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
Figure 2. Block Diagram
Figure 1. Packages
SO16
Table 1. Order Codes
Part Number
TDA7478D
E-TDA7478AD
TSSOP16
Package
SO16
TSSOP16
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.
C1 27pF 4.332MHz C2 47pF
MPX
270pF
4
8
FILOUT
VS
100nF
10µF
12
VREF 3
2nd ORDER
ANTIALIASING
FILTER
8th ORDER
SC-BANDPASS
FILTER
-
+
T57
15
OSCIN
13
OSCOUT
14
OSCILLATOR &
DIVIDER
57KHz PLL
1187.5Hz
PLL
QUAL DET.
5
OSEL
9
FSEL
16
RDCL
7
N.U.
1
QUAL
POLARITY
BIPHASE DEC.
INTEGRAL
BIPHASE DEC.
0
MUX
1
DIFF. DECODER
2
RDDA
TEST LOGIC
10
TM
November 2004
6
GND
11
EXTRES
D03AU1490
Rev. 2
1/8






E-TDA7478AD Datasheet, Funktion
TDA7478
Figure 6. TSSOP16 Mechanical Data & Package Dimensions
DIM.
MIN.
mm
TYP.
MAX. MIN.
inch
TYP. MAX.
A
1.200
0.047
A1 0.050
0.150 0.002
0.006
A2 0.800 1.000 1.050 0.031 0.039 0.041
b 0.190
0.300 0.007
0.012
c 0.090
0.200 0.005
0.009
D (1) 4.900 5.000 5.100 0.114 0.118 0.122
E 6.200 6.400 6.600 0.244 0.252 0.260
E1 (1) 4.300 4.400 4.500 0.170 0.173 0.177
e 0.650
0.026
L 0.450 0.600 0.750 0.018 0.024 0.030
L1 1.000
0.039
k 0˚ (min.) 8˚ (max.)
aaa
0.100
0.004
Note: 1. D and E1 does not include mold flash or protrusions.
Mold flash or potrusions shall not exceed 0.15mm
(.006inch) per side.
OUTLINE AND
MECHANICAL DATA
TSSOP16
(Body 4.4mm)
0080338 (Jedec MO-153-AB)
6/8

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