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STMicroelectronics Electronic Components Datasheet


E-TDA7478AD

SINGLE CHIP RDS DEMODULATOR



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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



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TDA7478
Table 2. Pin Description
No pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Name
QUAL
RDDA
VREF
MPX
OSEL
GND
N.U.
FILOUT
FSEL
TM
EXTRES
VS
OSCIN
OSCOUT
T57
RDCL
Description
Output for signal quality indication (High = good)
RDS data output
Reference voltage
RDS input signal
Oscillator selector pin:
- open, closed to VS = quartz oscillator
- closed to GND=external driven
Ground
Not Used (to be left open)
Filter output
Frequency selector pin:
- open = 4.332MHz
- closed to VS = 8.664MHz
Test mode pin: - open = normal operation - closed to VS = testmode
Reset pin: - open=run mode - closed to VS = reset condition
Supply voltage
Oscillator input
Oscillator output
Testing output pin: 57kHz clock output
RDS clock output 1187.5Hz
Figure 3. Pin Connection (Top view)
QUAL
RDDA
VREF
MPX
OSEL
GND
N.U.
FILOUT
1 16
2 15
3 14
4 13
5 12
6 11
7 10
89
D97AU752A
RDCL
T57
OSCOUT
OSCIN
VS
EXTRES
TM
FSEL
Table 3. Thermal Data
Symbol
Description
Rth j-case Thermal Resistance Junction-case Max.
Value
200
Unit
°C/W
2/8



Part Number E-TDA7478AD
Description SINGLE CHIP RDS DEMODULATOR
Maker STMicroelectronics - STMicroelectronics
Total Page 8 Pages
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