TDA7421 Datasheet, PDF (24/38 Pages) STMicroelectronics – AM/FM TUNER FOR CAR RADIO AND Hi-Fi APPLICATIONS

TDA7421
IF COUNTER REFERENCE CONTROL 2 (MSB) AND IF COUNTER MODE SELECT
MSB
D7 D6
0
0
0
0
0
0
D5 D4 D3 D2
0
0
0
0
0
0
0
0
0
0
0
0
all combinations allowed
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
1
1
0
1
1
IFCM1 IFCM0 IRC13 IRC12 IRC11 IRC10
fosc/ftim = LSB + MSB + 1
D1
0
0
1
0
1
1
IRC9
LSB
D0
0
1
0
1
0
1
IRC8
FUNCTION
MSB = 0
MSB = 256
MSB = 512
•••
MSB = 15616
MSB = 15872
MSB = 16128
NOT USED IN APPLICATION MODE
IF counter FM mode
IF counter AM mode
not used
Bit name
Subaddress = 07H
IF COUNTER CONTROL 1
MSB
D7 D6 D5 D4
0
1
IFENA
LSB
FUNCTION
D3 D2 D1 D0
0
0
0 don’t use
0
0
1 don’t use
0
1
0 don’t use
0
1
1 EW delta f = ±6.25KHz (FM); ±1KHz (AM)
1
0
0 EW delta f = ±12.5KHz (FM); ±2KHz (AM)
1
0
1 EW delta f = ±25KHz (FM); ±4KHz (AM)
1
1
0 EW delta f = ±50KHz (FM); ±8KHz (AM)
1
1
1 EW delta f = ±100KHz (FM); ±16KHz (AM)
IF counter disabled / stand by
IF counter enabled
EW2 EW1 EW0 Bit name
Subaddress = 08H
24/38