TDA7421N Datasheet, PDF (22/38 Pages) STMicroelectronics – AM/FM TUNER FOR CAR RADIO AND HI-FI APPLICATIONS

TDA7421N
CONTROL REGISTER FUNCTION
REGISTER NAME
FUNCTION
PC
Programmable Counter for VCO Frequency
RC
Reference Counter PLL
IRC
Reference Counter IF
IFCM
IF Counter Mode
EW
Frequency Error Window
IFENA
Enable IF Counter
CF
Center Frequency IF Counter
IFS
Sampling Time IF Counter
PM
Stby, FM, AM, AM swallow mode (PLL Mode)
D
Programmable Delay for Lock Detector
LPIN1/2
Loop Filter Input Select
A
Charge Pump High Current
B
Charge Pump Low Current
LDENA
Lock Detector Enable
CURRH
Set Current High
Figure 6. IF Counter Block Diagram
IFENA
IF-AM
IF-FM
OSC
EW-REGISTER
11-21 BIT COUNTER
ZD
CF-REGISTER
UP/DOWN COUNTER
14 BIT COUNTER
3 BIT COUNTER
IFC-REGISTER
IFS-REGISTER
D97AU809
22/38