TDA7540B Datasheet, PDF (16/75 Pages) STMicroelectronics – AM/FM Car Radio Tuner IC with Stereo Decoder and Intelligent Selectivity System (ISS)

Electrical specifications
TDA7540B
3.2.4 Stereodecoder
Table 7.
Electrical characteristics
(T_amb = 25°C, V_CC1 = V_CC2 = V_CC3 = V_CCST= V_CCVCO = V_CCMIX1 = V_CCMIX2 = V_CCIF1 = 8.5V,
V_MPX = 500mV_rmsmono, f = 1kHz, deemphasis = 50µs, f_Xtal = 10.25MHz, in application
circuit, unless otherwise specified).
Item Symbol
Parameter
Test Conditions
Min. Typ. Max. Unit
23 Stereodecoder
23.1
23.2
23.3
23.4
23.5
V_in
R_in
G_min
G_max
G_step
MPX input level
Input resistance
Min. Stereodecoder gain
Max. Stereodecoder gain
Stereodecoder gain step
resolution
STD Gain = 2,5 dB
23.6
SVRR
Supply voltage ripple
rejection
Vripple = 100mV, f = 1kHz
23.7
a
Max. channel separation ^{VMPX = 500mVrms stereo}
only L/R
23.8
THD Total harmonic distortion
23.9
(S+N)/N
Signal plus Noise to Noise
ratio
A-weighted, 19kHz notch
23.10
23.11
23.12
23.13
V_puafs
R_puafs
V_TH1
V_TH2
Pull up voltage for AFS pin
Pull up resistor for AFS pin
1. threshold for AFS PIN
2. threshold for AFS PIN
24 Mono/Stereo-switch
24.1
24.2
24.3
24.4
25
V_PTHST1
V_PTHST0
V_PTHMO1
V_PTHMO0
Pilot threshold voltage
Pilot threshold voltage
Pilot threshold voltage
Pilot threshold voltage
19kHz PLL
for Mono->Stereo, PTH = 1
for Mono->Stereo, PTH = 0
for Stereo->Mono, PTH = 1
for Stereo->Mono, PTH = 0
25.1
25.2
f_lock
PLL lock range
DP Pilot deviation
Pilot magnitude
20 mV_rms = 4%
Pilot frequency 19kHz
26 Deemphasis- and highcut
26.1
26.2
t_HC50
t_HC75
Deemphasis time constant
Deemphasis time constant
DEEMP = 0, DESFT = 1
V_LEVEL >> V_HCH
DEEMP = 1, DESFT = 1
V_LEVEL >> V_HCH
18.9
4
0.5 0.93
100
0
3.75
V_rms
kΩ
dB
dB
1.25
dB
60
dB
50
dB
0.02 0.3
%
85
dB
3.3
V
25
kΩ
2.4
V
0.8
V
10
mV_rms
14
mV_rms
8
mV_rms
12
mV_rms
19.1 kHz
30
%
50
µs
75
µs
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