TDA7540N Datasheet, PDF (48/76 Pages) STMicroelectronics – AM/FM car radio tuner IC with stereo decoder and intelligent selectivity system (ISS)

Software specification
TDA7540N
Table 18. Addr 6 IF counter control 2 (continued)
MSB
LSB
d7 d6 d5 d4 d3 d2 d1 d0
Function
010
011
100
101
110
111
Not valid
Δf = 6.25kHz (FM)1kHz (AM) not recommended
Δf = 12.5kHz (FM) 2kHz (AM) not recommended
Δf = 25kHz (FM) 4kHz (AM)
Δf = 50kHz (FM) 8kHz (AM)
Δf = 100kHz (FM)16kHz (AM)
Table 19. Addr 7 AM control
MSB
d7 d6 d5 d4 d3 d2
00
01
10
11
00
01
10
11
0
1
0
1
LSB
d1 d0
Function
0 Normal AGC time constant
1 Short time constant for AM seek stop
0
Multipath information available FM at PIN 24
1
AM stereo output available at PIN 24
Prescaler ratio 10
Prescaler ratio 8
Prescaler ratio 6
Prescaler ratio 4
Disable additional TV1, 2 offset
Enable additional TV1 offset +3.175V (for weather band)
Enable additional TV2 offset +3.175V (for weather band)
Enable additional TV1, 2 offset +3.175V (for weather band)
TV is tracking with PLL
TV is independing on PLL
Disable local mode
Enable local mode (PIN diode current = 0.5mA)
Table 20. Addr 8 quality ISS filter
MSB
LSB
d7 d6 d5 d4 d3 d2 d1 d0
Function
0 ISS filter control “ON” recommended
1 ISS filter control “OFF”
0
Switch ISS filter “OFF”
1
Switch ISS filter “ON”
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