TDA7513T_07 Datasheet, PDF (45/84 Pages) STMicroelectronics – Single chip FM/AM tuner with stereo decoder and audio processor

TDA7513T
Functional description
Figure 17. Relationship between unadjusted (LEVEL) and adjusted (LEVELITERN)
filtered field strength signals
INTERNAL
VOLTAGES
REF 5V
VSBL
SETUP OF VST
LEVEL INTERN
INTERNAL
VOLTAGES
REF 5V
LEVEL
58%
VSBL
29%
SETUP OF VMO
LEVEL INTERN
VMO
VST
t
FIELDSTRENGHT VOLTAGE
modAU639
VMO
t
VST
FIELDSTRENGHT VOLTAGE
Figure 18. Highcut characteristics
LOWPASS
TIME CONSTANT
3•τ_Deemp
τ_Deemp
VHCL
VHCH FIELDSTRENGHT
D97AU640
Figure 19. Noise blanker block diagram
MPX
MPOUT
RECTIFIER
RECT
+
-
VTH
+
LOWPASS
CONTROL
PEAK
+
modAU856
MONOFLOP
THRESHOLD
GENERATOR
ADDITIONAL
THRESHOLD
CONTROL
HOLDN
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