TDA7540N Datasheet, PDF (49/76 Pages) STMicroelectronics – AM/FM car radio tuner IC with stereo decoder and intelligent selectivity system (ISS)

TDA7540N
Software specification
Table 20. Addr 8 quality ISS filter (continued)
MSB
LSB
d7 d6 d5 d4 d3 d2 d1 d0
Function
0
Switch “OFF” ISS filter 120kHz
1
0
Switch “ON” ISS filter 80kHz
Switch “OFF” ISS filter 30KHz for weatherband
1
Switch “ON” ISS filter 30KHz for weatherband
000
discharge current1µA, charge current mid 74µA
narrow124µA
001
010
discharge current3µA, charge current mid 72µA
narrow122µA
discharge current5µA, charge current mid 70µA
narrow120µA
011
discharge current7µA, charge current mid 68µA
narrow118µA
-
-
-
-
111
discharge current15µA,charge current mid 60µA
narrow110µA
Table 21. Addr 9 quality detection adjacent channel
MSB
LSB
d7 d6 d5 d4 d3 d2 d1 d0
Function
0 dc-coupling deviation detector (has to be 0 in AM mode)
1 ac-coupling deviation detector (recommended mode)
0
AC highpass frequency 100kHz
1
AC bandpass frequency 100kHz
0
AC gain 32dB
1
AC gain 38dB
000
001
AC wide band threshold 0.25V
AC wide band threshold 0.35V
010
AC wide band threshold 0.45V
-
-
-
-
111
00
AC wide band threshold 0.95V
AC narrow band threshold 0.0V
01
AC narrow band threshold 0.1V
10
AC narrow band threshold 0.2V
11
AC narrow band threshold 0.3V
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