TDA7427A Datasheet, PDF (16/21 Pages) STMicroelectronics – AM-FM RADIO FREQUENCY SYNTHESIZER AND IF COUNTER

TDA7427A
IF COUNTER REFERENCE CONTROL 2 (MSB) AND IF COUNTER MODE SELECT
MSB
LSB
FUNCTION
D7
D6
D5
D4
D3
D2
D1
D0
0
0
0
0
0
0
0
0 MSB = 0
0
0
0
0
0
0
0
1 MSB = 256
0
0
0
0
0
0
1
0 MSB = 512
1
1
1
0
0
0
1
1
0
1
1
IFCM1 IFCM0 IRC13
fosc/ftim = LSB + MSB + 1
1
1
1
IRC12
1
1
1
IRC11
1
1
1
IRC10
0
1
1
IRC9
1
0
1
IRC8
MSB = 15616
MSB = 15872
MSB = 16128
NOT USED IN APPLICATION MODE
IF counter FM mode
IF counter AM mode
IF counter AM 10.7MHz upconversion mode
Bit name
Subaddress = 07H
IF COUNTER CONTROL 1
MSB
LSB
FUNCTION
D7
D6
D5
D4
D3
D2
D1
D0
0
0
0 don’t use
0
0
1 don’t use
0
1
1 EW delta f = ±6.25kHz (FM); ±1kHz (AM; AM-UPC)
1
0
0 EW delta f = ±12.5kHz (FM); ±2kHz (AM; AM-UPC)
1
0
1 EW delta f = ±25kHz (FM); ±4kHz (AM; AM-UPC)
1
1
0 EW delta f = ±50Hz (FM); ±8kHz (AM; AM-UPC)
1
1
1
EW delta f = ±100kHz (FM); ±16kHz (AM; AM-
UPC)
X
X
X
X
don’t use
0
IF counter disabled / stand by
1
IF counter enabled
FENA FR3 FR2 FR1 FR0 EW2 EW1 EW0 Bit name
Subaddress = 08H
16/21