TDA7513T Datasheet, PDF (32/59 Pages) STMicroelectronics – SINGLE-CHIP FM/AM TUNER WITH STEREO DECODER AND AUDIO PROCESSOR

TDA7513T
Figure 18. Relationship between unadjusted (LEVEL) and adjusted (LEVELITERN) filtered field
strength signals
INTERNAL
VOLTAGES
REF 5V
SETUP OF VST
LEVEL INTERN
INTERNAL
VOLTAGES
REF 5V
SETUP OF VMO
LEVEL INTERN
VSBL
LEVEL
58%
VSBL
29%
VMO
VST
t
FIELDSTRENGHT VOLTAGE
modAU639
VMO
Figure 19. Highcut Characteristics
LOWPASS
TIME CONSTANT
3•τ_Deemp
t
VST
FIELDSTRENGHT VOLTAGE
τ_Deemp
VHCL
VHCH FIELDSTRENGHT
D97AU640
Figure 20.
MPX
MPOUT
RECTIFIER
RECT
+
-
VTH
+
LOWPASS
CONTROL
PEAK
+
modAU856
MONOFLOP
THRESHOLD
GENERATOR
ADDITIONAL
THRESHOLD
CONTROL
HOLDN
Figure 21. Block diagram of the Multipath Detector
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