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Micrel
Mod_la
MICRF505BML/YML
Mod_lb
Mod_filter off
Mod_filter on
Mod_la > Mod_lb
Figure 23. Modulator Waveform with and without
Figure 21. Two Different Modulator Current Settings
Modulator Attenuator
A third way to set the deviation is by programming
the modulator attenuator, Mod_A2..Mod_A0, the last
being LSB. The purpose of the attenuator is to allow
small deviations when the bit rate is small and/or the
BT is small (these settings will give a relatively slow
modulator clock, and therefore long rise- and fall
times, which in turn results in large frequency
Filtering
Mod_F=0 disables the modulator filter and Mod_F=7
gives most filtering. Figure 23 shows a waveform
with and without the filter.
Calculation of the Frequency Deviation
The parameters influencing the frequency deviation
can be summarized in the following equations:
deviations). In addition, the attenuator will improve
the resolution of the modulator.
Mod_Aa
f MOD_CLK =
f XCO
Refclk_K ? 2 (7-Mod_clkS)
Mod_Ab
f DEV =
Mod_I
f MOD_CLK
?
1
1 + Mod_A
? ( C 1 + C 2 ? f RF )
Mod_Ab > Mod_Ab
Where:
f DEV :
Single sided frequency deviation
[Hz].
Figure 22. Two Different Modulator Attenuator
Settings
The effect of the attenuator is given by:
f XCO :
f RF :
Refclk_K:
Crystal oscillator frequency [Hz].
Center frequency [Hz].
6 bit divider, values between 1
and 63.
f DEVIATION
∝
1
1 + Mod_A
Mod_clkS:
f MOD_CLK :
Modulator clock setting, values
between 0 and 7.
Modulator clock frequency,
derived from the crystal
Figure 22 shows two waveforms with different
attenuator setting: Mod _ Aa < Mod _ Ab . If Mod_A is
increased, the frequency deviation is lowered and
vice versa.
Modulator Filter
To reduce the high-frequency components in the
generated waveform, a filter with programmable cut-
off frequency can be enabled. This is done using
Mod_F2..Mod_F0, the least one being LSB. The
Mod_F should be set according to the formula:
150 × 10 3
MOD _ F =
BitRate
October 2006
27
Mod_I:
Mod_A:
C1:
C2:
frequency, Refclk_K and
Mod_clkS.
Modulator current setting,
values between 0 and 31.
Modulator attenuator setting,
values between 0 and 15.
? 4.42 × 10 10
72
M9999-103106
+1 408-944-0800
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