TDA7421 Datasheet, PDF (23/38 Pages) STMicroelectronics – AM/FM TUNER FOR CAR RADIO AND Hi-Fi APPLICATIONS

TDA7421
LOCK DETECTOR & PLL MODE CONTROL
MSB
LSB
FUNCTION
D7
D6
D5
D4
D3
D2
D1
D0
0
0 PLL standby mode
0
1 PLL AM
1
0 not used
1
1 PLL FM mode
0
0
PD phase difference threshold 10ns
0
1
PD phase difference threshold 20ns
1
0
PD phase difference threshold 30ns
1
1
PD phase difference threshold 40ns
0
0
Not used in application mode
0
1
Activation delay = 4 ⋅ fref
1
0
Activation delay = 6 ⋅ fref
1
1
Activation delay = 8 ⋅ fref
0
No lock detector controlled chargepump
1
Lock detector controlled chargepump
LDENA
D3
D2
D1
D0 PM1 PM0 Bit name
Subaddress = 05H
IF COUNTER REFERENCE CONTROL 1 (LSB)
MSB
D7
0
0
0
1
1
1
1
IRC7
D6
0
0
0
1
1
1
1
IRC6
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
1
1
1
1
IRC5 IRC4 IRC3 IRC2
D1
0
0
1
0
0
1
1
IRC1
LSB
D0
0
1
0
0
1
0
1
IRC0
LSB = 0
LSB = 1
LSB = 2
•••
LSB = 252
LSB = 253
LSB = 254
LSB = 255
Bit name
FUNCTION
Subaddress = 06H
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