TDA7479
Single chip RDS demodulator + filter
Features
■
■
■
■
■
■
■
■
Very high RDS demodulation quality with
improved digital signal processing
High performance, 57 kHz bandpass filter
(8
th
order)
FIlter adjustment free and without external
components
Purely digitaL RDS Demodulation without
external components
ARI (SK indication) and RDS signal quality
output
4.332 MHz crystal oscillator
(8.664 and 17.328 MHz optional)
Low noise CMOS technology
Low radiation
TSSOP16
SO16
Description
The TDA7479 recovers the additional inaudible
RDS information which is transmitted by FM radio
broadcasting stations and operates in accordance
with the EBU (European Broadcasting Union)
specifications.
Table 1.
Device summary
Order code
E-TDA7479D
(1)
E-TDA7479AD
(1)
The device is made up of two sections: a
cascaded antialiasing + switched capacitors 8
th
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 processed by a suitable
RDS decoder.
Outputs for RDS signal quality and ARI indication
are also present.
Package
SO16
TSSOP16
Packing
Tube
Tube
1. Device in ECOPACK® package (see
Section 5: Package information on page 9).
September 2013
Rev 8
1/12
www.st.com
12
Contents
TDA7479
Contents
1
Block diagram and pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1
1.2
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2
Electrical specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.1
2.2
2.3
Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3
4
5
6
Output timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Oscillator controls (FSEL, OSEL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2/12
TDA7479
Block diagram and pin description
1
1.1
Figure 1.
Block diagram and pin description
Block diagram
Block diagram
C1 27pF
4.332MHz
C2 47pF
T57
15
4
270pF
2nd ORDER
ANTIALIASING
FILTER
OSCIN
13
OSCOUT
14
MPX
5
OSCILLATOR &
DIVIDER
9
OSEL
FSEL
16
FILOUT
8
8th ORDER
SC-BANDPASS
FILTER
57KHz PLL
1187.5Hz
PLL
7
1
V
S
100nF
VREF
10μF
INTEGRAL
BIPHASE DEC.
3
-
+
POLARITY
BIPHASE DEC.
0
1
2
12
FAST ARI
INDICATOR
QUAL DET.
RDCL
ARI
QUAL
MUX
DIFF. DECODER
RDDA
10
TEST LOGIC
TM
6
GND
11
EXTRES
D97AU751A
1.2
Pin description
Figure 2.
Pin connection (top view)
QUAL
RDDA
VREF
MPX
OSEL
GND
ARI
FILOUT
1
2
3
4
5
6
7
8
D97AU752
16
15
14
13
12
11
10
9
RDCL
T57
OSCOUT
OSCIN
V
S
EXTRES
TM
FSEL
3/12
Block diagram and pin description
Table 2.
No pin
1
2
3
4
5
6
TDA7479
Pin description
Name
QUAL
RDDA
VREF
MPX
OSEL
GND
Description
Output for signal quality indication (High = good)
RDS data output
Reference voltage
RDS input signal
Oscillator selector pin:
– open, closed to V
S
= 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:
– 100 kHz to V
S
= 17.328 MHz
– open = 4.332MHz
– closed to VS = 8.664 MHz
Test mode pin:
– open = normal operation
– closed to VS = test mode
7
ARI
8
FILOUT
9
FSEL
10
TM
11
12
13
14
15
16
Reset pin:
EXTRES – open = run mode
– -closed to VS = reset condition
V
S
OSCIN
Supply voltage
Oscillator input
OSCOUT Oscillator output
T57
RDCL
Testing output pin: 57 kHz clock output
RDS clock output 1187.5 Hz
4/12
TDA7479
Electrical specification
2
2.1
Electrical specification
Thermal data
Table 3.
Symbol
R
th j-case
Thermal data
Parameter
Thermal resistance junction to case
Max.
SO16
200
TSSOP16
160
Unit
°C/W
2.2
Absolute maximum ratings
Table 4.
Symbol
V
S
T
op
T
stg
Supply voltage
Operating temperature range
Storage temperature
Absolute maximum ratings
Parameter
Value
-0.3 to 7
-40 to 85
-55 to 150
Unit
V
°C
°C
2.3
Table 5.
Symbol
V
S
I
S
Filter
f
C
BW
G
Electrical characteristics
Electrical characteristics
(T
amb
= 25°C, V
S
= 5V, unless otherwise specified)
Parameter
Supply voltage
Supply current
Test condition
Min.
4.5
Typ.
5
7.5
Max.
5.5
11.0
Unit
V
mA
Center frequency
3dB Bandwidth
Gain
f = 57 kHz
f
± 4 kHz
56.5
2.5
18
18
50
35
80
1
V
IN
= 3 mVrms
f = 19 kHz; T3
40 dB
(1)
f = 57 kHz (RDS+ ARI)
1
3
30
57
3
20
22
60
45
120
57.5
3.5
22
kHz
kHz
dB
dB
dB
dB
A
Attenuation
f = 38 kHz
f = 67 kHz
R
I
R
L
S/N
V
IN
S
RDS
S
ARI
Input impedance of MPX
Load impedance on FILOUT
Signal to noise ratio
MPX input signal
RDS detection sensitivity
ARI Detection Sensitivity
150
K
M
40
1000
50
dB
mV
RMS
mV
RMS
mVrms
mVrms
5/12
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