E-TDA7478AD PDF даташит
Спецификация E-TDA7478AD изготовлена «STMicroelectronics» и имеет функцию, называемую «SINGLE CHIP RDS DEMODULATOR». |
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Детали детали
Номер произв | E-TDA7478AD |
Описание | SINGLE CHIP RDS DEMODULATOR |
Производители | STMicroelectronics |
логотип |
8 Pages
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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
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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
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Table 4. Absolute Maximum Ratings
Symbol
VS
Top
Tstg
Parameter
Supply Voltage
Operating Temperature Range
Storage Temperature
TDA7478
Value
-0.3 to 7
-40 to 85
-55 to 150
Unit
V
°C
°C
Table 5. Electrical Characteristcs
(Tamb = 25°C, VS = 5V, unless otherwise specified)
Symbol
Parameter
Test Condition
Min. Typ. Max. Unit
VS Supply voltage
4.5 5 5.5 V
IS Supply current
7.5 12.0 mA
FILTER
fC Center frequency
56.6 57 57.4 kHz
BW 3dB Bandwidth
2.5 3 3.5 kHz
G Gain
f = 57kHz
17 20 23 dB
A Attenuation
∆f ± 4kHz
22 dB
f = 38kHz
60 dB
f = 67kHz
45 dB
RI Input impedance of MPX
120 KΩ
RL Load impedance on FILOUT
1 MΩ
S/N Signal to noise ratio
VIN = 3mVRMS
30 40
dB
VIN MPX input signal
f = 19kHz; T3 ≤ 40dB(1)
f = 57kHz (RDS)
1000 mVRMS
50 mVRMS
SRDS RDS Detection Sensitivity
1 mVrms
SARI ARI Detection Sensitivity
3 mVrms
VREF Reference
VS/2
V
DEMODULATOR
Input pins (EXTRES, FSEL, TM)
Input pin (OSEL)
all with internal pull down resistor
with internal pull up resistor
IPD Input Current
VIN = 5V (pull-down input)
15
30 µA
IPU Input Current
VIN = 0V (pull-up input) -25 -10 µA
VIH Input voltage high
0.7 · VS 0.8 · VS
V
VIL Input voltage low
0.2 · VS 0.3 · VS V
Output pins (RDCL, RDDA, QUAL, T57)
VOH Ouput voltage high
IL = 0.5mA
4 4.6
V
VOL Output voltage low
IL = 0.5mA
0.4 1
V
OSCILLATOR
VCLL Input level OSCIN pin
OSEL = open circuit
1V
VCLH Input level OSCIN pin
OSEL = open circuit
4
V
Amplitude OSCOUT
OSEL = open circuit
4.5 V
VPP Amplitude OSCIN
(for external drive)
OSEL = GND, f = 4.332MHz
OSEL = GND, f = 8.664MHz
100 mVpp
120 mVpp
(1) The 3rd harmonic (57kHz) must be less than -40dB with respect to the input signal plus gain.
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E-TDA7478AD | SINGLE CHIP RDS DEMODULATOR | STMicroelectronics |
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