STMICROELECTRONICS TDA7330

TDA7330B
®
SINGLE CHIP RDS DEMODULATOR + FILTER
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
(8.664MHz OPTIONAL)
LOW NOISE MIXED BIPOLAR/CMOS TECHNOLOGY
DESCRIPTION
The TDA7330B is a RDS demodulator. It recovers the additional inaudible RDS information
which is transmitted by FM radio broadcasting
stations.
The output data signal (RDDA) and clock signal
(RDCL) can be further processed by a suitable
RDS decoder (microprocessor).
The device operates in accordance with the EBU
(European Broadcasting Union) specifications.
The IC includes a 2nd order antialiasing input fil-
DIP20
SO20
ORDERING NUMBERS:
TDA7330B
TDA7330BD
ter, a 57KHz switched capacitor band pass filter,
a smoothing filter and cross detector, a bit rate
clock recovery circuit, a 57KHz PLL, BI-PHASE
PSK decoder, differential decoding circuit, ARI indication and RDS signal quality output.
BLOCK DIAGRAM
November 1999
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TDA7330B
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
7
V
Operating Temperature Range
-40 to 85
°C
Storage Temperature
-40 to 150
°C
VCC
Supply Voltage
Top
Tstg
THERMAL DATA
Symbol
Rth j-case
Description
Thermal Resistance Junction-case
Typ.
DIP20
SO20
Unit
100
200
°C/W
PIN CONNECTION (Top view)
PIN FUNCTION
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Nr.
Name
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
MUXIN
Vref
COMP
FIL OUT
GND
T1
T3
T4
OSC OUT
OSC IN
T57
RDCL
RDDA
QUAL
ARI
16
17
18
19
VCC
T2
FSEL
TM
20
POR
Description
RDS input signal.
Reference voltage
Not inverting comparator input (smoothing filter)
Filter Output
Ground
Testing output pin (not to be used)
Testing output pin (not to be used)
Testing output pin (not to be used)
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 signals are present)
(High when only ARI is present)
(Low when only RDS is present)
(indefined when no signal is present)
Supply Voltage
Testing output pin (not to be used)
Frequency selector pin: open = 4.332MHz, closed to VCC = 8.664MHz
Test mode pin (open = normal RUN)
(closed to VCC = Test mode)
Reset Input for testing (active high)
TDA7330B
ELECTRICAL CHARACTERISTICS (VCC = 5V, Tamb = 25°C; Rg = 600Ω; fosc = 4.332MHz;
VIN = 20mVrms unless otherwise specified)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
4.5
5
9
40
2.5
5.5
V
mA
KΩ
V
56.5
2.5
18
18
50
35
57
3
20
22
80
50
0.5
1
2
160
40
57.5
3.5
22
KHz
KHz
dB
dB
dB
dB
DEG
DEG
DEG
KΩ
dB
Vrms
mVrms
KΩ
SUPPLY
VCC
IS
RPOR
PORON
Supply Voltage
Supply Current
POR Pull Down Resistor
POR Threshold
pin 20
FILTER(measured an pin 4 FILOUT)
FC
BW
G
A
Center Frequency
3dB Bandwidth
Gain
Attenuation
∆Ph
Phase non linearity
Ri
S/N
Vi
Input Impedance
Signal to Noise Ratio
Maximum Input Signal Capability
RL
Load Impedance
f = 57KHz
∆f = +4KHz
f = 38KHz; Vi = 500mVrms
f = 67KHz; Vi = 250mVrms
A (see note1)
B (see note1)
C (see note1)
Vi = 3mVrms
f = 19KHz; T3 < –40dB (see note2)
f = 57KHz (RDS + ARI)
Pin 4
100
30
5
7.5
10
200
1
50
100
CROSS DETECTOR
RA
Resistance pin 3-4
15
21
28
KΩ
1
MHz
MHz
V
V
VPP
OSCILLATOR
FOSC
Oscillator Frequency
VCLL
VCLH
Clock Input level LOW (pin 10)
Clock Input Level HIGH (pin 10)
Output Amplitude (pin 9)
4.332
8.664
FSEL = Open (*)
FSEL = Closed to VCC (**)
4
4.5
(*) FSEL pin has an internal 40KΩ pull down resistor A 4.332MHz QUARTZ must be used (**) A 8.664MHz QUARTZ must be used.
DEMODULATOR
∆fO
SRDS
SARI
Tlock
VOH
VOL
fRDS
tD
Max Oscillator Deviation
RDS Detection Sensitivity
ARI Detection Sensitivity
RDS Lockup Time
Output HIGH Voltage
Output LOW Voltage
Data Rate for RDS
RDDA Transition versus RDCL
FSEL = Open
+ 1.2
1
3
100
IL = 0.5mA; pins 12, 13, 14, 15
IL = 0.5mA; pins 12, 13, 14, 15
RDCL pin
(see figure 2)
4
1
1187.5
4.3
KHz
mVrms
mVrms
ms
V
V
Hz
µsec
Note(1):
The phase non linearity is defined as: ∆Ph = | -2 φf2 + φf1 + φf3 |
where φfx is the input-output phase difference at the frequency fx (x = 1,2,3)
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TDA7330B
ELECTRICAL CHARACTERISTICS (continued)
Measure
A
B
C
f1 (KHz)
56.5
56
55.5
f2 (KHz)
57
57
57
f3 (KHz)
57.5
58
58.5
∆Ph max
<5°
<7.5°
<10°
Note(2): The 3th harmonic (57KHz) must be less than -40dB in respect to the input signal 19KHz plus gain.
Figure 2: RDS timing diagram
OUTPUT TIMING
The generated 1187.5Hz output clock (RDCL
line) is synchronized to the incoming data.
According to the internal PLL lock condition this
Figure 3: Test Circuit
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data change can results on the falling or on the
rising clock edge.
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.
TDA7330B
APPLICATION SUGGESTION
A good DC decoupling between VCC and
GROUND is necessary: a 100nF ceramic capacitor, with low resistance and low inductance
at high frequency, directly connected on pin 16
(VCC)and 5 (GND) is recommended.
A small series inductance (100µH) or resistor
(27Ω) may be used for supply line filtering.
The Layout path pin2 - C2 - pin5 must be as
short as possible.
If the supply line, after the power on has a soft
and disturbed (spikes) slope, a capacitor of
100nF, between POR and VCC, is racommended.
The various testing pins have no sense for the
customer.
Figure 4: P.C. board and component layout of fig. 3 (1:1 scale)
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TDA7330B
Figure 5: Gain vs. Frequency
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Figure 6: Group Delay vs. Frequency
TDA7330B
mm
DIM.
MIN.
a1
0.254
B
1.39
TYP.
inch
MAX.
MIN.
TYP.
MAX.
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
OUTLINE AND
MECHANICAL DATA
3.3
0.130
DIP20
Z
1.34
0.053
7/9
TDA7330B
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
SO20
K
0˚ (min.)8˚ (max.)
L
h x 45˚
A
B
e
A1
K
H
D
20
11
E
1
0
1
SO20MEC
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C
TDA7330B
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. Specification 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.
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© 1999 STMicroelectronics – Printed in Italy – All Rights Reserved
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