TDA7705_10 Datasheet, PDF (36/42 Pages) STMicroelectronics – Highly integrated tuner for AM/FM car radio

Weak signal processing
TDA7705
Table 31. De-emphasis filter
(continuous set)
Symbol
Parameter
DEtc
De-emphasis time constant 1 -
De-emphasis time constant 2 -
Test condition
Min
Typ
Max Units
-
50
-
µs
-
75
-
5.1.6 Stereo decoder
Table 32. Stereo decoder
Symbol
Parameter
PilSup Pilot signal suppression
SubcSup Subcarrier suppression
Test condition
Min
Typ
Max Units
Pilot 9%, 19 kHz, ref=40 kHz -
60
-
dB
f = 38 kHz
-
70
-
dB
f = 57 kHz
-
70
-
dB
f = 76 kHz
-
80
-
dB
5.2
AM IF-processing
5.2.1 Channel selection filter
Table 33. Channel selection filter
Symbol
Parameter
CSF BW Channel selection filter BW
Test condition
response: - 3dB
Min
Typ
Max Units
-
±3.7
-
kHz
5.2.2 Soft mute
Table 34. Soft mute
(continuous set)
Symbol
Parameter
Test condition
Min
Typ
Max Units
audio atten = 1 dB
SMsp Start point vs. field strength read “FM_softmute”
0
no adjacent channel present
audio atten = SMd + 1 dB
SMep End point vs. field strength read “FM_softmute”
0
no adjacent channel present
25
40 dBµV
0
30 dBµV
SMd Depth
-
-40
-24
0
dB
SMtauatt
SMtaurel
Transition time for field
strength-dependent soft mute -
activation
Transition time for field
strength-dependent soft mute -
release
0.001 0.1
10
s
0.001
3
10
s
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Doc ID 15938 Rev 8