TDA7541B Datasheet, PDF (28/77 Pages) STMicroelectronics – AM/FM car radio tuner IC with stereo decoder and intelligent selectivity system

Functional description
Table 10. ISS filter control by I²C bus
I²C control bits
Notes
TDA7541B
28/77
0 X X X X X ISS filter is switched off (bypass)
1 1 0 X X X ISS filter is in manual control mode, Band width is 120 kHz
1 1 1 X X X ISS filter is in manual control mode, Band width is 80 kHz
1
1
X
1
X
X
ISS filter is in manual control mode, Band width is 22 kHz
This setting must be used for weather band application
1
0
X
X
0
0
ISS filter is in automatic control mode
Filter activation and band width defined by control table mode1
1
0
X
X
1
0
ISS filter is in automatic control mode
Filter activation and band width defined by control table mode2
ISS filter is in automatic control mode
1 0 0 X 0 1 Filter activation defined by control table mode1
band width fixed to 120 kHz
ISS filter is in automatic control mode
1 0 0 X 1 1 ^{Filter activation defined by control table mode2}
band width fixed to 120 kHz
ISS filter is in automatic control mode
1 0 1 X 0 1 Filter activation defined by control table mode1
band width fixed to 80 kHz
ISS filter is in automatic control mode
1 0 1 X 1 1 Filter activation defined by control table mode2
band width fixed to 80 kHz
Description of I²C bits:
ISSENA
ISS filter enable
“1”: ISS filter control enabled
“0”: ISS filter is switched off (bypass of the filter, wide)
ISSON
ISS filter control mode
“1”: ISS filter is in manual control mode (switched "ON"); the bits ISSBW and WBON are
defining the bandwidth
“0”: ISS filter is in automatic control mode according to mode1/2 table
ISSBW
ISS filter band width
“1”: 80 kHz
Doc ID 16048 Rev 1