TDA7331
®
SINGLE CHIP RDS DEMODULATOR + FILTER
VERY HIGH RDS DEMODULATION QUALITY
WITH IMPROVED DIGITAL SIGNAL PROCESSING
HIGH PERFORMANCE, 57KHz BANDPASS
FILTER (8th ORDER)
PURELY DIGITAL RDS DEMODULATION
WITHOUT EXTERNAL COMPONENTS
ARI INDICATION AND RDS SIGNAL QUALITY OUTPUTS
4.332MHz CRYSTAL OSCILLATOR
(8.664 and 17.328MHz SELECTABLE OPTIONS)
LOW NOISE CMOS TECHNOLOGY
LOW RADIATION
DIP20
ORDERING NUMBERS:
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MPX
270pF
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FILOUT
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TDA7331
DESCRIPTION
The TDA7331, an improved version of
TDA7330B, 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.
The device is made up of two sections: a casBLOCK DIAGRAM and TEST CIRCUIT
SO20
TDA7331D
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caded antialiasing + switched capacitors 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 furher processed by a suitable RDS decoder.
Outputs for RDS signal quality and ARI indication
are also present.
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C1 27pF
T57
4.332MHz
OSCIN
C2 47pF
OSCOUT
10
11
2nd ORDER
ANTIALIASING
FILTER
9
3
OSCILLATOR &
DIVIDER
18
12
8th ORDER
SC-BANDPASS
FILTER
4
1187.5Hz
PLL
57KHz PLL
15
14
FAST ARI
INDICATOR
16
VS
)
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QUAL DET.
OSEL
FSEL
RDCL
ARI
QUAL
100nF
VREF
-
2
+
POLARITY
BIPHASE DEC.
0
1
10µF
MUX
DIFF. DECODER
19
INTEGRAL
BIPHASE DEC.
5
GND
September 2003
6,7,8,17
N.C.
13
TEST LOGIC
RDDA
TM
20
EXTRES
D97AU686B
1/7
TDA7331
ABSOLUTE MAXIMUM RATINGS
Symbol
VS
Top
Tstg
Parameter
Supply Voltage
Operating Temperature Range
Storage Temperature
Value
7
-40 to 85
-55 to 150
Unit
V
°C
°C
PIN FUNCTION
No pin
1
2
3
Name
MPX
VREF
OSEL
4
5
6
7
8
9
10
11
12
13
14
15
FILOUT
GND
nc
nc
nc
OSCOUT
OSCIN
T57
RDCL
RDDA
QUAL
ARI
16
17
18
Vs
nc
FSEL
19
TM
20
EXTRES
PIN CONNECTION
Functional description
RDS input signal
Reference voltage
Oscillator selector pin: - open, or closed to Vs = quartz oscillator
- closed to GND = external driven
Filter output
Ground
Not connected
Not connected
Not connected
Oscillator output
Oscillator input
Testing output pin: 57kHz clock output
RDS clock output 1187.5Hz
RDS data output
Output for signal quality indication (High = good)
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
Supply voltage
Not connected
Frequency selector pin: - 100K to VS = 17.328MHz
- 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
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-
MPX
1
20
EXTRES
VREF
2
19
TM
OSEL
3
18
FSEL
FILOUT
4
17
N.C.
GND
5
16
VS
N.C.
6
15
ARI
N.C.
7
14
QUAL
N.C.
8
13
RDDA
OSCOUT
9
12
RDCL
10
11
T57
OSCIN
D97AU687
2/7
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TDA7331
THERMAL DATA
Symbol
Description
Rth j-amb
Thermal Resistance Junction-Ambient
DIP20
SO20
Unit
100
200
°C/W
Max
ELECTRICAL CHARACTERISTICS (Tamb = 25°C, VS = 5V, unless otherwise specified).
Symbol
Parameter
VS
Supply voltage
IS
Supply current
Test Condition
Min.
4.5
Typ.
Max.
Unit
5
5.5
V
7.5
11.0
mA
FILTER
fC
BW
Center frequency
56.5
57
57.5
kHz
3dB Bandwidth
2.5
3
3.5
kHz
22
dB
G
Gain
f = 57kHz
18
20
A
Attenuation
∆f ± 4kHz
f = 38kHz
18
50
22
60
f = 67kHz
RI
RL
Input impedance of MPX
Load impedance on FILOUT
35
80
1
45
120
S/N
Signal to noise ratio
VIN = 3mVRMS
30
40
VIN
MPX input signal
f = 19kHz; T3 ≤ 40dB(1)
f = 57kHz (RDS+ ARI)
VREF
Reference
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DEMODULATOR
Input pins (EXTRES, FSEL, TM)
Input pin (OSEL)
Input Current
Input Current
Input voltage high
IPD
IPU
VIH
(s)
Input voltage low
VIL
Output pins (RDCL, RDDA, ARI, QUAL, T57)
VOH
Ouput voltage high
VOL
Output voltage low
OSCILLATOR
VCLL
VCLH
s
b
O
IL = 0.5mA
OSEL = open circuit
OSEL = open circuit
OSEL = open circuit
Amplitude OSCIN
(for external drive)
OSEL = GND,
f = 4.332MHz
OSEL = GND,
f = 8.664MHz
OSEL = GND,
f = 17.328MHz
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150
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1000
50
VS/2
dB
KΩ
MΩ
dB
mVRMS
mVRMS
V
all with internal pull down resistor
with internal pull up resistor
15
-25
0.7 ⋅ VS 0.8 ⋅ VS
30
-10
0.2 ⋅ VS 0.3 ⋅ VS
4
IL = 0.5mA
Input level OSCIN pin
Input level OSCIN pin
Amplitude OSCOUT
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-
VIN = 5V (pull-down input)
VIN = 0V (pull-up input)
dB
dB
4.6
0.4
µA
µA
V
V
V
1
V
1
4.5
V
V
V
100
mVpp
120
mVpp
150
mVpp
4
(1) The 3rd harmonic (57kHz) must be less than -40dB with respect to the input signal plus gain.
3/7
TDA7331
Figure 1. RDS timing diagram
CLOCK
LINE
DATA
LINE
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. 1)
Whichever clock edge is used by the decoder
(rising or falling edge) the data will remain valid
for 416.7 µsec after the clock transition.
OSCILLATOR CONTROLS (FSEL, OSEL)
Three different crystal frequencies can be used.
The adaption of the internal clock divider to the
external crystal is achieved via the input pin
FSEL. See the followings table for reference:
Crystal
FSEL (pin configuration)
4.332MHz
8.664MHz
17.328MHz
connected to GND or open
connected to Vs
external resistor of 100K to Vs
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4/7
A special mode is introduced to reduce EMI. With
pin OSEL connected to GND the internal oscillator is switched off and an external sinusoidal frequency could be applied on OSCIN. The peak to
peak voltage of this signal can be reduced down
to 60mV.
In this mode the frequency selection via FSEL is
still active.
Suggested values of C1 and C2 are shown in the
following table:
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Crystal
4.332MHz
8.664MHz
17.328MHz
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C1
C2
27pF
27pF
27pF
47pF
-
TDA7331
mm
DIM.
MIN.
a1
0.254
B
1.39
TYP.
inch
MAX.
MIN.
TYP.
MAX.
OUTLINE AND
MECHANICAL DATA
0.010
1.65
0.055
0.065
b
0.45
0.018
b1
0.25
0.010
D
25.4
1.000
E
8.5
0.335
e
2.54
0.100
e3
22.86
0.900
F
7.1
0.280
I
3.93
0.155
L
3.3
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DIP20
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0.130
1.34
0.053
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5/7
TDA7331
mm
inch
OUTLINE AND
MECHANICAL DATA
DIM.
MIN.
TYP.
MAX.
MIN.
TYP.
MAX.
A
2.35
2.65
0.093
0.104
A1
0.1
0.3
0.004
0.012
B
0.33
0.51
0.013
0.020
C
0.23
0.32
0.009
0.013
D
12.6
13
0.496
0.512
E
7.4
7.6
0.291
0.299
e
1.27
0.050
H
10
10.65
0.394
0.419
h
0.25
0.75
0.010
0.030
L
0.4
1.27
0.016
0.050
K
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SO20
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0˚ (min.)8˚ (max.)
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-
L
h x 45˚
A
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A1
K
H
D
20
11
E
1
0
1
SO20MEC
6/7
C
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TDA7331
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Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences
of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is
granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are
subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products
are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.
The ST logo is a registered trademark of STMicroelectronics.
All other names are the property of their respective owners
© 2003 STMicroelectronics - All rights reserved
STMicroelectronics GROUP OF COMPANIES
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