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TDA7541B Datasheet, PDF (56/77 Pages) STMicroelectronics – AM/FM car radio tuner IC with stereo decoder and intelligent selectivity system | |||
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Software specification
TDA7541B
Table 29. Addr 12 AM IF NB (AM B1h)
MSB
LSB
d7 d6 d5 d4 d3 d2 d1 d0
Function
AINENA
-
- - - - - - 0 AM IF noise blanker disable
1 AM IF noise blanker enable
AINTH<4:1>
0000
not recommended
----
-
0010
not recommended
0100
AM IF NB Threshold 50 mV
-
-
-
0101
- AM IF NB Threshold 62.5 mV
----
-
1000
AM IF NB Threshold 100 mV
----
-
1111
AM IF NB Threshold 187.5 mV
AINT<6:5>
00
AM IF NB Time 8 µs
-
01 - - - -
- AM IF NB Time 11 µs
10
AM IF NB Time 14 µs
11
AM IF NB Time 17 µs
IFAGCS
0
------
- Enable AM IFAGC threshold shift down (check address6)
1
Disable AM IFAGC threshold shift down
Table 30. Addr 13 XTAL adjust(80h)
MSB
d7 d6 d5 d4 d3 d2 d1
0000
0000
-
- - 0001
0001
0010
1111
1111
0
00
0
01
0
10
0
11 -
-
-
-
1
00
1
01
1
10
1
11
LSB
d0
Function
XTAL<4:0>
0 CLoad 0pF
1 CLoad 0.75 pF
0 CLoad 1.5 pF
1 CLoad 2.25 pF
0 CLoad 3 pF
0 CLoad 22.5 pF
1 CLoad 23.25 pF
SL<7:5>
S meter slope FM = 0.75 V/20 dB, AM = 1.61 V/20 dB
S meter slope FM = 0.80 V/20 dB, AM = 1.75 V/20 dB
S meter slope FM = 0.85 V/20 dB, AM = 1.89 V/20 dB
- S meter slope FM = 0.90 V/20 dB, AM = 1.98 V/20 dB
S meter slope FM = 0.95 V/20 dB, AM = 2.04 V/20 dB
S meter slope FM = 1.0 V/20 dB, AM = 2.1 V/20 dB
S meter slope FM = 1.05 V/20 dB, AM = 2.15 V/20 dB
S meter slope FM = 1.1 V/20 dB, AM = 2.20 V/20 dB
56/77
Doc ID 16048 Rev 1
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