Micrel
MICRF405
April 2006
20
M9999-041906
(408) 955-1690
The frequency synthesizer consists of a voltage-
controlled oscillator (VCO), crystal oscillator,
prescaler, programmable frequency dividers, phase-
detector and charge pumps. Two different types of
prescalers are integrated, a pulse swallow and a
phase select prescaler. The recommended prescaler
is the phase select prescaler (Prescaler_Sel=0,
which is default). There is both a configurable on-
chip loop filter and an external loop filter. The
lengths of the N and M and A registers are 12, 12
and 6 bits respectively. The M, N and A values can
be calculated from the formula:
Phase select prescaler (Prescaler_Sel=0):
)
31
(
A
N
k
M
f
f
XCO
RF
+
?/DIV>
=
Pulse swallow prescaler (Prescaler_Sel=1):
)
2
32
(
A
N
k
M
f
f
XCO
RF
+
?/DIV>
=
,
where:
f
XCO
: Crystal oscillator frequency
f
RF
: RF frequency
0 < A d N
k: 6: RF frequency 290-325 MHz,
Freq_Band[1:0]=0
4: RF frequency 430-490 MHz,
Freq_Band[1:0]=1
2: RF frequency 860-980 MHz,
Freq_Band[1:0]=2-3
There are two sets of each of the divide factors (i.e.
A0 and A1). If modulation by using the dividers is
selected Modulation1=1, Modulation0=0), the two
sets should be programmed to give two RF
frequencies, separated by two times the specified
single sided frequency deviation. For all other
modulation methods, the 0-set will be used. The
value of A is constrained to be less or equal to N,
0<=A<=N.
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