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PDF TDA7478 Data sheet ( Hoja de datos )
| Número de pieza | TDA7478 | |
| Descripción | SINGLE CHIP RDS DEMODULATOR | |
| Fabricantes | ST Microelectronics | |
| Logotipo |  |
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TDA7478
Single chip RDS demodulator
Features
■ Very high RDS demodulation quality with
improved digital signal processing
■ High performance, 57 kHz bandpass filter (8th
order)
■ Filter adjustment free and without external
components
■ Purely digital RDS demodulation without
external components
■ RDS signal quality output
■ 4.332 MHz crystal oscillator (8.664 MHz
optionaL)
■ Low noise cmos technologY
■ Low radiation
Description
The TDA7478 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.
*$3*36
TSSOP16
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 processed by a suitable
RDS decoder.
Output for RDS signal quality is also present.
Table 1. Device summary
Order code
E-TDA7478AD
E-TDA7478ADTR
Package
TSSOP16
Packing
Tube
Tape and reel
September 2013
Doc 10679 Rev 4
1/11
www.st.com
11
1 page  
TDA7478
2 Electrical specifications
Electrical specifications
2.1
Thermal data
Table 3. Thermal data
Symbol
Description
Rth j-case Thermal resistance junction-to-case
Max.
Value
200
Unit
°C/W
2.2 Absolute maximum ratings
Table 4. Absolute maximum ratings
Symbol
Parameter
VS Supply voltage
Top Operating temperature range
Tstg Storage temperature
Value
-0.3 to 7
-40 to 85
-55 to 150
Unit
V
°C
°C
2.3 Electrical characteristics
Tamb = 25°C, VS = 5V, unless otherwise specified.
Table 5.
Symbol
Electrical characteristics
Parameter
Test condition
VS Supply voltage
IS Supply current
-
-
Filter
fC Center frequency
BW 3 dB bandwidth
G Gain
A Attenuation
RI Input impedance of MPX
RL Load impedance on FILOUT
S/N Signal to noise ratio
VIN MPX input signal
SRDS RDS detection sensitivity
-
-
f = 57 kHz
Δf ± 4 kHz
f = 38 kHz
f = 67 kHz
-
-
VIN = 3 mVRMS
f = 19 kHz; T3 ≤ 40 dB(1)
f = 57 kHz (RDS)
-
Min.
4.5
-
Typ.
5
7.5
Max.
5.5
12.0
Unit
V
mA
56.6 57 57.4 kHz
2.5 3 3.5 kHz
17 20 23 dB
- 22 - dB
- 60 - dB
- 45 - dB
- 120 - KΩ
1 - - MΩ
30 40 - dB
- - 1000 mVRMS
50 mVRMS
1 - - mVrms
Doc 10679 Rev 4
5/11
5 Page 
TDA7478
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Doc 10679 Rev 4
11/11
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