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TDA7478
Table 4. Absolute Maximum Ratings
(1) The 3rd harmonic (57kHz) must be less than -40dB with respect to the input signal plus gain.
Symbol Parameter Value Unit
V
S
Supply Voltage -0.3 to 7 V
T
op
Operating Temperature Range -40 to 85 °C
T
stg
Storage Temperature -55 to 150 °C
Table 5. Electrical Characteristcs
(T
amb
= 25°C, V
S
= 5V, unless otherwise specified)
Symbol Parameter Test Condition Min. Typ. Max. Unit
V
S
Supply voltage 4.5 5 5.5 V
I
S
Supply current 7.5 12.0 mA
FILTER
f
C
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
R
I
Input impedance of MPX 120 KΩ
R
L
Load impedance on FILOUT 1 MΩ
S/N Signal to noise ratio V
IN
= 3mVRMS 30 40 dB
V
IN
MPX input signal
f = 19kHz; T3 ≤ 40dB
(1)
f = 57kHz (RDS)
1000
50
mV
RMS
mV
RMS
S
RDS
RDS Detection Sensitivity 1 mVrms
S
ARI
ARI Detection Sensitivity 3 mVrms
V
REF
Reference V
S
/2 V
DEMODULATOR
Input pins (EXTRES, FSEL, TM) all with internal pull down resistor
Input pin (OSEL) with internal pull up resistor
I
PD
Input Current V
IN
= 5V (pull-down input) 15 30 µA
I
PU
Input Current V
IN
= 0V (pull-up input) -25 -10 µA
V
IH
Input voltage high
0.7 · V
S
0.8 · V
S
V
VIL Input voltage low
0.2 · V
S
0.3 · V
S
V
Output pins (RDCL, RDDA, QUAL, T57)
V
OH
Ouput voltage high I
L
= 0.5mA 4 4.6 V
V
OL
Output voltage low I
L
= 0.5mA 0.4 1 V
OSCILLATOR
V
CLL
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
V
PP
Amplitude OSCIN
(for external drive)
OSEL = GND, f = 4.332MHz
OSEL = GND, f = 8.664MHz
100
120
mVpp
mVpp
