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TDA7786 数据表(PDF) 48 Page - STMicroelectronics

部件名 TDA7786
功能描述  ELITE automotive tuners for AM/FM car-radio
PDF  54 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

TDA7786 数据表(HTML) 48 Page - STMicroelectronics

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Weak signal processing
TDA7786, TDA7786M
48/54
DocID026122 Rev 5
5.1.6
Stereo decoder
5.2
AM IF-processing
5.2.1
Channel selection filter
5.2.2
Soft mute
Table 41. De-emphasis filter - continuous set
Symbol
Parameter
Test condition
Min
Typ
Max
Units
DEtc
De-emphasis time constant 1 -
-
50
-
µs
De-emphasis time constant 2 -
-
75
-
Table 42. Stereo decoder - continuous set
Symbol
Parameter
Test condition
Min
Typ
Max
Units
PilSup
Pilot signal suppression
Pilot 9%, 19 kHz, ref = 40 kHz
-
60
-
dB
SubcSup
Subcarrier suppression
f = 38 kHz
-
70
-
dB
f = 57 kHz
-
70
-
dB
f = 76 kHz
-
80
-
dB
Table 43. Channel selection filter
Symbol
Parameter
Test condition
Min
Typ
Max
Units
CSF BW
Channel selection filter BW
response: - 3dB
-
±3.7
-
kHz
Table 44. Soft mute - continuous set
Symbol
Parameter
Test condition
Min
Typ
Max
Units
SMsp
Start point vs. field strength
audio atten = 1 dB
read “FM_SoftMute”
no adjacent channel present
025
40
dBµV
SMep
End point vs. field strength
audio atten = SMd + 1 dB
read “FM_SoftMute”
no adjacent channel present
0
0
30
dBµV
SMd
Depth
-
-40
-24
0
dB
SMtauatt
Transition time for field
strength-dependent soft mute
activation
-
0.001
0.1
10
s
SMtaurel
Transition time for field
strength-dependent soft mute
release
-
0.001
3
10
s



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