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TDA7540N Datasheet, PDF (20/76 Pages) STMicroelectronics – AM/FM car radio tuner IC with stereo decoder and intelligent selectivity system (ISS)
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Electrical specifications
TDA7540N
Table 8.
Stereodecoder electrical characteristics (continued)
(Tamb = 25°C, VCC1 = VCC2 = VCC3 = VCCST= VCCVCO = VCCMIX1 = VCCMIX2 = VCCIF1 = 8.5V,
VMPX = 500mVrms mono, f = 1kHz, deemphasis = 50µs, fXtal = 10.25MHz, in application
circuit, unless otherwise specified).
Symbol
Parameter
Test conditions
Min. Typ. Max. Unit
Vpuafs
Rpuafs
VTH1
VTH2
Pull up voltage for AFS pin
Pull up resistor for AFS pin
1. threshold for AFS PIN
2. threshold for AFS PIN
Mono/stereo-switch
3.1
3.3 3.5
V
25
kΩ
2.2
2.4 2.6
V
0.6
0.8 1.0
V
VPTHST1
VPTHST0
VPTHMO1
VPTHMO0
19kHz PLL
Pilot threshold voltage
Pilot threshold voltage
Pilot threshold voltage
Pilot threshold voltage
for Mono->Stereo, PTH = 1
for Mono->Stereo, PTH = 0
for Stereo->Mono, PTH = 1
for Stereo->Mono, PTH = 0
6
10
15 mVrms
10
14
19 mVrms
4
8
12 mVrms
7
12
16 mVrms
flock
PLL lock range
DP
Pilot deviation
Pilot magnitude
20 mVrms = 4%
18.9
Pilot frequency 19kHz
4
19.1 kHz
30
%
Deemphasis- and highcut
tHC50 Deemphasis time constant
tHC75 Deemphasis time constant
tHC25 Deemphasis time constant
tHC37 Deemphasis time constant
tHC50 Highcut time constant
tHC75 Highcut time constant
FAMCMin Min. AM corner frequency
FAMCMin Max. AM corner frequency
DEEMP = 0, DESFT = 1
VLEVEL >> VHCH
DEEMP = 1, DESFT = 1
VLEVEL >> VHCH
DEEMP = 0, DESFT = 0
VLEVEL >> VHCH
DEEMP = 1, DESFT = 0
VLEVEL >> VHCH
DEEMP = 0, DESFT = 1
VLEVEL << VHCL
DEEMP= 1, DESFT = 1
VLEVEL << VHCL
DEEMP = 0, DESFT = 1
AMCF
DEEMP = 0, DESFT = 1
AMCF
50
μs
75
μs
25
μs
37.5
μs
150
μs
225
μs
1.06
kHz
3.18
kHz
Stereoblend- and highcut-control
LGmin Min. level gain
LG
LGmax Max. level gain
LG
LGstep Level gain step resolution
LG
-0.5
0
0.5
dB
4.0
4.7 5.2
dB
0.4 0.67 0.9
dB
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