LMX2581_14 Datasheet, PDF (11/56 Pages) Texas Instruments – Wideband Frequency Synthesizer

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Typical Characteristics (continued)
10
50 ohm Resistor
18 nH Inductor
8
6
4
2
0
-2
0 500 1000 1500 2000 2500 3000 3500 4000
Output Frequency (MHz)
D001
LMX2581
SNAS601G – AUGUST 2012 – REVISED SEPTEMBER 2014
1000
700
500
400
300
200
100
70
50
40
30
20
10
1E+8
Pull-Up Component
None
51 ohm Resistor
18 nH Inductor
2E+8 3E+8 5E+8 7E+8 1E+9
Frequency (Hz)
2E+9 3E+94E+9
D001
Figure 8. Single-Ended Output Power vs. Frequency
5
0
-5
-10
-15
-20
-25
-30
-35
0
25C, Buffer On
25C, Buffer Off
-40 C Buffer Off
85C, Buffer Off
500 1000 1500 2000 2500 3000 3500 4000
Frequency (MHz)
D001
Figure 9. Impedance of RFoutX Pins
400
Real
350
Magnitude
Imaginary
300
250
200
150
100
50
0
-50
-100
-150
-200
-250
0
1E+9
2E+9
Frequency (Hz)
3E+9
4E+9
D001
Figure 10. Sensitivity for External VCO Input (Fin) Pin
-7.5
-10
-12.5
-15
-17.5
-20
-22.5
-25
-27.5
-30
-32.5
OSCin Doubler Enabled
OSCin Doubler Disabled
-35
100 200 300 400 500 600 700 800 900 1000
Frequency (MHz)
D001
Figure 11. Impedance of External VCO Input (Fin) Pin
700
Real
600
Magnitude
Imag
500
400
300
200
100
0
-100
-200
-300
-400
0
100 200 300 400 500 600 700 800 900 1000
Frequency (MHz)
D001
Figure 12. OSCin Input Sensitivity
Figure 13. OSCin Input Impedance
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