TDA7541 Datasheet, PDF (52/76 Pages) STMicroelectronics – AM/FM car radio tuner IC with stereo decoder and intelligent selectivity system

Software specification
TDA7541
Table 23. Addr 7 Quality AC (FM 50h)
MSB
LSB
d7 d6 d5 d4 d3 d2 d1 d0
Function
ISSBW
0 ISS filter fixed band width 120kHz
1 ISS filter fixed band width 80kHz
BWDEF
0
Disable bit ISSBW for ISS filter band width control
1
Enable bit ISSBW for ISS filter band width control
ACF
0
AC highpass frequency 100kHz
1
AC bandpass frequency 100kHz
ACTH<4:3>
00
AC detector threshold 0,35V
01
AC detector threshold 0,45V
10
11
AC detector threshold 0,55V
AC detector threshold 0,65V
TISS<7:5>
0 00
discharge current 1µA, charge current mid 74µA, narrow 124µA
0 01
discharge current 3µA, charge current mid 72µA, narrow 122µA
0 10
0 11
discharge current 5µA, charge current mid 70µA, narrow 120µA
discharge current 7µA, charge current mid 68µA, narrow 118µA
- --
-
1 11
discharge current 15µA,charge current mid 60µA, narrow 110µA
52/76