TDA7512F Datasheet, PDF (41/45 Pages) STMicroelectronics – FM car-radio tuner IC with intelligent selectivity system (ISS)

TDA7512F
Block diagrams
Table 34. Block diagram quality detection principle (without overdeviation
correction)
Signal
Low
High
ac
No adjacent channel
Adjacent channel present
ac+
No strong adjacent channel
Adjacent channel higher as ac
sm
Fieldstrength higher as softmute
threshold
Fieldstrength lower as softmute
threshold
dev
Deviation lower as threshold DWTH Deviation higher as threshold DWTH
dev+
Deviation lower as threshold
DTH*DWTH
Deviation higher as threshold
DTH*DWTH
inton
ISS filter off by logic (wide)
ISS filter on by logic
int80
ISS filter 120kHz (mid)
ISS filter 80kHz (narrow)
Table 35. Input signals modes
Input signals
Mode 1
Mode 2
0ac 0ac+ 0sm 0dev 0dev+ 0inton 0int80 0Function 0inton 0int80 0Function
0
0
0
0
0
0
0
wide
0
0
wide
0
0
0
1
0
0
0
wide
0
0
wide
0
0
0
1
1
0
0
wide
0
0
wide
0
0
1
0
0
1
1
narrow
1
1
narrow
0
0
1
1
0
0
0
wide
1
0
mid
0
0
1
1
1
0
0
wide
0
0
wide
1
0
0
0
0
1
1
narrow
1
0
mid
1
1
0
0
0
1
1
narrow
1
1
narrow
1
0
0
1
0
1
0
mid
1
0
mid
1
1
0
1
1
1
0
mid
1
1
narrow
1
0
1
0
0
1
1
narrow
1
1
narrow
1
1
1
0
0
1
1
narrow
1
1
narrow
1
0
1
1
0
1
0
mid
1
0
mid
1
1
1
1
0
1
0
mid
1
1
narrow
1
0
1
1
1
1
0
mid
1
0
mid
1
1
1
1
1
1
0
mid
1
1
narrow
Doc ID 12668 Rev 2
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