TDA7541 Datasheet, PDF (56/76 Pages) STMicroelectronics – AM/FM car radio tuner IC with stereo decoder and intelligent selectivity system

Software specification
TDA7541
Table 28. 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 50mV
0101
AM IF NB Threshold 62.5mV
----
-
1000
AM IF NB Threshold 100mV
----
-
1111
AM IF NB Threshold 187.5mV
AINT<6:5>
00
AM IF NB Time 8µs
01
AM IF NB Time 11µs
10
AM IF NB Time 14µs
11
AM IF NB Time 17µs
IFAGCS
0
Enable AM IFAGC threshold shift down (check address6)
1
Disable AM IFAGC threshold shift down
Table 29. 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 C_Load 0pF
1 C_Load 0.75pF
0 C_Load 1.5pF
1 C_Load 2.25pF
0 C_Load 3pF
--
0 C_Load 22.5pF
1 C_Load 23.25pF
SL<7:5>
S meter slope FM = 0.75V/20dB, AM = 1.61V/20dB
S meter slope FM = 0.80V/20dB, AM = 1.75V/20dB
S meter slope FM = 0.85V/20dB, AM = 1.89V/20dB
S meter slope FM = 0.90V/20dB, AM = 1.98V/20dB
S meter slope FM = 0.95V/20dB, AM = 2.04V/20dB
S meter slope FM = 1.0V/20dB, AM = 2.1V/20dB
S meter slope FM = 1.05V/20dB, AM = 2.15V/20dB
S meter slope FM = 1.1V/20dB, AM = 2.20V/20dB
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