TDA7541 Datasheet, PDF (20/76 Pages) STMicroelectronics – AM/FM car radio tuner IC with stereo decoder and intelligent selectivity system

Electrical specifications and characteristics
TDA7541
Table 8.
Stereo decoder section
(T_amb=25°C, V_CC1=V_CC2=V_CCMIX1=V_CCVCO=V_CCIF=8.5V, f_Xtal = 10.25 MHz,
V_MPX=500mV_rms mono, f=1kHz, deemphasis τ=50µs, in application circuit, unless otherwise
specified)
Item Symbol
Parameter
Test conditions
Min. Typ. Max. Unit
27. Stereo decoder
27.1
Vin MPX input level
27.2
WBON = 1
27.3
27.4
27.5
27.6
R_in
G_STD
G_STDWB
SVRR
Input resistance
Stereo decoder gain
Stereo decoder gain
Supply voltage ripple
rejection
Weather band mode
V_ripple = 100mV, f = 1kHz
27.7
A channel separation
V_MPX = 500 mV_rms stereo, only
L/R, ROC adjusted
27.8 THD Total harmonic distortion
27.9
(S+N)/N
Signal plus noise to noise
ratio
A-weighted, 19 kHz notch
28. Mono/stereo switch
28.1
28.2
28.3
28.4
V_PTHST1 Pilot threshold voltage
V_PTHST0 Pilot threshold voltage
V_PTHMO1 Pilot threshold voltage
V_PTHMO0 Pilot threshold voltage
29. 19kHz PLL
for Stereo, PTH = 1
for Stereo, PTH = 0
for Mono, PTH = 1
for Mono, PTH = 0
29.1
29.2
f_lock Capture range
DP Pilot deviation range
30. Deemphasis and highcut
Pilot magnitude 20 mV_rms = 4%
f_pilot = 19kHz
30.1
30.2
30.3
t_HC50
t_HC75
Deemphasis time
constant
Deemphasis time
constant
t_HC50 Highcut time constant
30.4 t_HC75 Highcut time constant
30.5 A_Ammin Min. Attenuation in AM
30.6 A_Ammax Max. Attenuation in AM
DEEMP=0, High Cut OFF
DEEMP = 1, High Cut OFF
DEEMP = 0, High Cut ON,
V₂₈=0.1V
DEEMP= 1, High Cut ON,
V₂₈=0.1V
Voutmax/Vout@ f = 3.5kHz,
DEEMP = 0, AMCF “111”
Voutmax/Vout@ f = 3.5kHz,
DEEMP= 0, AMCF “000”
0.5 0.93
0.05 0.06
V_rms
80 100 120 kΩ
2 2.5 3
dB
23 26 27
dB
60
dB
35 40
dB
0.02 0.3
%
85
dB
5
8
12 mV_rms
7
11
16 mV_rms
3.5
6
10 mV_rms
6
9
14 mV_rms
18.9
19.1 kHz
4
30
%
45 50 55
μs
67 75 83
μs
135 150 165 μs
200 225 250 μs
4.5 6.5 8.5 dB
11 14 17
dB
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