TDA7427A Datasheet, PDF (7/21 Pages) STMicroelectronics – AM-FM RADIO FREQUENCY SYNTHESIZER AND IF COUNTER

Figure 1. FM and AM (SW) operation (swallow mode)
OSC IN
REGISTER
R0 ...R15
PREDIVIDER
:R
fref
PD
fsyn
TDA7427A
∆ϕ
TO CHARGE
PUMP
AM IN
FM IN
REGISTER
PC0 ...PC4
COUNTER
A
PRESCALER
M/M+1
REGISTER
PC5 ... P15
COUNTER
:B
D95AU375A
Table 2. Control Register Functions.
REGISTER NAME
PC
RC
IRC
IFCM
EW
IFENA
CF
IFS
PM
D
LPIN1/2
PLLSTOP
A
B
LDENA
CURRH
OSC
DOUT1
DOUT2....6
INLOCK
FUNCTION
Programmable counter for VCO frequency
Reference counter PLL
Reference counter IF
IF counter mode selector
Frequency error window IF counter
Enable IFRC
Center frequency IF counter
Sampling time IF counter
Stby, FM, AM, AM swallow mode selector
Programmable delay and phase error for lock detector
Loop filter input select
PLL stop
Charge pump high current
Charge pump low current
Lock detector enable
Set current high
Oscillator adjust
Push pull output 5V
Open collector output
Lock detector output
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