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Micrel
Mod_la
MICRF506BML/YML
Mod_lb
Mod_filter off
Mod_filter on
Mod_la > Mod_lb
Figure 23. Modulator Waveform with and without
f MOD_CLK =
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
deviations). In addition, the attenuator will improve
the resolution in the modulator.
Filtering
Mod_F=0 disables the modulator filter and Mod_F=7
gives most filtering. Figure 22 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:
f XCO
Refclk_K × 2 (7 ? Mod_clkS )
Mod_Aa
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 :
f XCO :
Single sided frequency deviation
[Hz]
Crystal oscillator frequency [Hz]
Figure 22. Two Different Modulator Attenuator
Settings
The effect of the attenuator is given by:
f RF :
Refclk_K:
Mod_clkS:
Center frequency [Hz]
6 bit divider, values between 1
and 63
Modulator clock setting, values
f DEVIATION ×
1
1 + Mod_A
f MOD_CLK :
between 0 and 7
Modulator clock
derived from
frequency,
the crystal
frequency,
Refclk_K
and
d _ d _ A M M
Figure 22 shows two A waveforms b with different
attenuator setting: < . If Mod_A
Mod_I:
Mod_clkS
Modulator
current
setting,
is increased, the frequency deviation is lowered and
values between 0 and 31
vice versa.
Mod_A:
Modulator
attenuator
setting,
values between 0 and 15
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:
July 2006
27
C1:
C2:
-2.17 ? 10 10
82
M9999-092904
+1 408-944-0800
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