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Micrel
MICRF505BML/YML
XCOtune
0
1
2
4
8
16
31
Start-up Time ( μ s)
590
590
700
700
810
1140
2050
Table 8. VCO Bit Setting
The bias bit will optimize the phase noise, and the
frequency bit will control a capacitor bank in the
VCO. The tuning range, the RF frequency versus
varactor voltage, is dependent upon the VCO
frequency setting, and can be shown in Figure 7.
When the tuning voltage is in the range from 0.9V to
1.4V, the VCO gain is at its maximum, approximately
65-70MHz/V. It is recommended that the varactor
Table 7. Typical values with C EXT = 1.5pF
If an external reference is used instead of a crystal,
the signal shall be applied to pin 24, XTALOUT. Due
to internal DC setting in the XCO, an AC coupling is
recommended to be used between the external
reference and the XTALOUT-pin.
voltage stays in this range.
The input capacitance at the varactor pin must be
taken into consideration when designing the PLL
loop filter. This is most critical when designing a loop
filter with high bandwidth, which gives relatively
small component values. The input capacitance is
approximately 6pF.
VCO
A6..A0
0000011
D7
‘1’
D6
‘1’
D5
‘0’
D4
VCO_IB2
D3
VCO_IB1
D2
VCO_IB0
D1
VCO_freq1
D0
VCO_freq0
1000
Tuning range
980
The VCO has no external components. If has three
bit to set the bias current and two bit to set the VCO
frequency. These five bit are set by the RF
frequency, as follows:
960
940
920
900
880
860
840
820
'00'
'01'
'10'
'11'
RF freq.
VCO_IB2
VCO_IB1
VCO_IB0
VCO_freq1 VCO_freq0
800
0
0.5
1
1.5
2
2.5
850MHz
868MHz
915MHz
950MHz
1
0
0
0
1
1
0
0
1
1
1
0
0
0
1
1
0
1
0
1
Varactor voltage (V)
Figure 7. RF Frequency vs. Varactor Voltage
and VCO Frequency bit (V DD = 2.25V)
October 2006
17
M9999-103106
+1 408-944-0800
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