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TDA7479 Datasheet(PDF) 3 Page - STMicroelectronics

Part No. TDA7479
Description  SINGLE CHIP RDS DEMODULATOR FILTER
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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THERMAL DATA
Symbol
Description
DIP20
SO20
Unit
Rth j-amb
Thermal Resistance Junction-Ambient
Max
100
200
°C/W
ELECTRICAL CHARACTERISTICS (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
11.0
mA
FILTER
fC
Center frequency
56.5
57
57.5
kHz
BW
3dB Bandwidth
2.5
3
3.5
kHz
G
Gain
f = 57kHz
18
20
22
dB
A
Attenuation
∆f ± 4kHz
18
22
dB
f = 38kHz
50
60
dB
f = 67kHz
35
45
dB
RI
Input impedance of MPX
80
120
150
K
RL
Load impedance on FILOUT
1
M
S/N
Signal to noise ratio
VIN =3mVRMS
30
40
dB
VIN
MPX input signal
f = 19kHz; T3
≤ 40dB(1)
f = 57kHz (RDS+ ARI)
1000
50
mVRMS
mVRMS
VREF
Reference
VS/2
V
DEMODULATOR
Input pins (EXTRES, FSEL, TM)
all with internal pull down resistor
Input pin (OSEL)
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, ARI, 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
1
V
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
100
mVpp
OSEL = GND,
f = 8.664MHz
120
mVpp
OSEL = GND,
f = 17.328MHz
150
mVpp
(1) The 3rd harmonic (57kHz) must be less than -40dB with respect to the input signal plus gain.
TDA7479
3/7




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