Datasheet
© 2009-2011 Microchip Technology Inc. Preliminary DS70590C-page 51
MRF49XA
FIGURE 3-6: AFC CIRCUIT FOR FREQUENCY OFFSET CORRECTION
SEL
11
10
Y
MUX
Digital AFC
Core Logic
Digital Limiter
Frequency
Offset
Register
ADDER
Baseband Signal IN
If IN > MaxDEV then,
OUT = MaxDEV
If IN < MinDEV then,
OUT = MinDEV
ELSE,
OUT = IN
Output Enable
7-Bit
12-Bit
Signals for Auto
Operation modes
Strobe
Range Limit
POR
Auto Operation
AUTOMS<1:0>
DIO
Enable Calculation
/4
HAM
10 MHz CLK
CLK
FINE
FIFOEN
ARFO<1:0>
MFCS
FOREN
FREQB<11:0>
Output Enable
Strobe
CLK CLR
F
COR<11:0>
Corrected Frequency
Parameter to
Synthesizer
Parameter from Frequency
Control Word
7
7
OFFSB
<6:0>
AFCCT
STSIG