TDA7540B Datasheet, PDF (50/75 Pages) STMicroelectronics – AM/FM Car Radio Tuner IC with Stereo Decoder and Intelligent Selectivity System (ISS)

Software specification
TDA7540B
Table 24. Addr 13 Softmute Control 2 (continued)
MSB
LSB
d7 d6 d5 d4 d3 d2 d1 d0
Function
1111
AC mute “OFF”
0
AC mute filter 110KHz
1
AC mute filter 100KHz
Table 25. Addr 14 VCODIV/PLLREF
MSB
LSB
d7 d6 d5 d4 d3 d2 d1 d0
Function
0 0 not valid (only for testing)
0 1 VCO frequency divided by 2
1 0 VCO frequency divided by 3
1 1 original VCO frequency
0
VCO” I” signal 0 degree
1
VCO “I” signal 180 degree
100
PLL reference frequency 50KHz
101
110
PLL reference frequency 25KHz
PLL reference frequency 10KHz
111
PLL reference frequency 9KHz
000
PLL reference frequency 2KHz
0
Select FM mode
1
0
Select AM mode
Select PLL low pass filter FM
1
Select PLL low pass filter AM
Table 26. Addr 15 FM AGC
MSB
d7 d6 d5 d4 d3 d2
00
01
10
11
LSB
d1 d0
Function
0
0 RFAGC threshold V_9-11TH= 85(77 ANT)dBµV
0
1 RFAGC threshold V_9-11TH= 90(82 ANT)dBµV
1
0 RFAGC threshold V_9-11TH= 94(86 ANT)dBµV
1
1 RFAGC threshold V_9-11TH= 96(88 ANT)dBµV
IFAGC threshold V_77TH= 86(60 ANT)dBµV
IFAGC threshold V_77TH= 92(66 ANT)dBµV
IFAGC threshold V_77TH= 96(70 ANT)dBµV
IFAGC threshold V_77TH= 98(72 ANT)dBµV
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