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TDA7540B Datasheet(PDF) 65 Page - STMicroelectronics

Part # TDA7540B
Description  AM/FM Car Radio Tuner IC with Stereo Decoder and Intelligent Selectivity System (ISS)
PDF  75 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TDA7540B Datasheet(HTML) 65 Page - STMicroelectronics

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TDA7540B
Appendix
65/75
Block Diagram Quality Detection Principle (without overdeviation correction)
Table 51.
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 52.
Input Signals
Mode1
Mode2
ac
ac+
sm
dev
dev+
inton
int80
Function
inton
int80
Function
000
00
0
0
wide
0
0
wide
000
10
0
0
wide
0
0
wide
000
11
0
0
wide
0
0
wide
0
0
1
0
0
1
1
narrow
1
1
narrow
001
10
0
0
wide
1
0
mid
001
11
0
0
wide
0
0
wide
100
00
1
1
narrow
1
0
mid
1
1
0
0
0
1
1
narrow
1
1
narrow
100
10
1
0
mid
1
0
mid
110
11
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
101
10
1
0
mid
1
0
mid
111
10
1
0
mid
1
1
narrow
101
11
1
0
mid
1
0
mid
111
11
1
0
mid
1
1
narrow



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