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TDA7479 Datasheet

SINGLE CHIP RDS DEMODULATOR FILTER

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TDA7479
SINGLE CHIP RDS DEMODULATOR + FILTER
VERY HIGH RDS DEMODULATION QUALITY
WITH IMPROVED DIGITAL SIGNAL PROC-
ESSING
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
DESCRIPTION
The TDA7479 recovers the additional inaudible
RDS information which is transmitted by FM radio
broadcasting stations and operates in accord-
ance with the EBU (European Broadcasting Un-
ion) specifications.
BLOCK DIAGRAM AND TEST CIRCUIT
DIP16
SO16
ORDERING NUMBERS:
TDA7479
TDA7479D
The device is made up of two sections: a cas-
caded antialiasing + switched capacitors band-
pass filter for precise RDS band selection and a
demodulating section that performs the extraction
od RDS data stream (RDDA) and clock (RDCL),
to be furher processed by a suitable RDS de-
coder.
Outputs for RDS signal quality and ARI indication
are 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
FAST ARI
INDICATOR
1187.5Hz
PLL
QUAL DET.
5
OSEL
9
FSEL
16
RDCL
7
ARI
1
QUAL
POLARITY
BIPHASE DEC.
INTEGRAL
BIPHASE DEC.
0
MUX
1
DIFF. DECODER
2
RDDA
TEST LOGIC
10
TM
6
GND
11
EXTRES
D97AU751A
February 1998
1/7


STMicroelectronics Electronic Components Datasheet

TDA7479 Datasheet

SINGLE CHIP RDS DEMODULATOR FILTER

No Preview Available !

TDA7479
ABSOLUTE MAXIMUM RATINGS
Symbol
VS
Top
Tstg
Parameter
Supply Voltage
Operating Temperature Range
Storage Temperature
THERMAL DATA
Value
-0.3 to 7
-40 to 85
-55 to 150
Symbol
Description
Rth j-case Thermal Resistance Junction-case
PIN DESCRIPTION
Max.
DIP16
100
SO16
200
No pin
1
2
3
4
5
6
7
Name
QUAL
RDDA
VREF
MPX
OSEL
GND
ARI
8 FILOUT
9 FSEL
10 TM
11 EXTRES
12 VS
13 OSCIN
14 OSCOUT
15 T57
16 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
Output for ARI indication:
- high when RDS+ARI are present
- high when only ARI is present
- low when only RDS is present
- undefined when nos signal is present
Filter output
Frequency selector pin:
Test mode pin:
Reset pin:
-100K to VS = 17.328MHz
- open = 4.332MHz
- closed to VS = 8.664MHz
- open = normal operation
- closed to VS = testmode
- 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
PIN CONNECTION (Top View)
Unit
V
°C
°C
Unit
°C/W
QUAL
RDDA
VREF
MPX
OSEL
GND
ARI
FILOUT
1 16
2 15
3 14
4 13
5 12
6 11
7 10
89
D97AU752
RDCL
T57
OSCOUT
OSCIN
VS
EXTRES
TM
FSEL
2/7


Part Number TDA7479
Description SINGLE CHIP RDS DEMODULATOR FILTER
Maker ST Microelectronics
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TDA7479 Datasheet PDF





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