TDA7541 Datasheet, PDF (50/76 Pages) STMicroelectronics – AM/FM car radio tuner IC with stereo decoder and intelligent selectivity system

Software specification
Table 21. Addr 5 TPLL Divider (FM 3Dh , AM 2Dh)
MSB
LSB
d7 d6 d5 d4 d3 d2 d1 d0
Function
VCOD<2:0>
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
RC<5:3>
011
PLL reference frequency 2 kHz
100
PLL reference frequency 9 kHz
101
110
PLL reference frequency 10 kHz (AM)
PLL reference frequency 25 kHz
111
PLL reference frequency 50 kHz (FM)
AMD<7:6>
0
0
AM VCO predivider ratio 10
0
1
1
0
AM VCO predivider ratio 8
AM VCO predivider ratio 6
1
1
AM VCO predivider ratio 4
TDA7541
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