LMX2541 Datasheet, PDF (20/70 Pages) National Semiconductor (TI) – Ultra-Low Noise PLLatinum Frequency Synthesizer with Integrated VCO

LMX2541
SNOSB31J – JULY 2009 – REVISED DECEMBER 2014
20
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10
0
Ensured Operating Range
-10
T_A = 25^oC
T_A = 85^oC
-20
T_A = -40^oC
-30
-40
0
1000
2000
3000
4000
5000
6000
7000
8000
f_ExtVCOin (MHz)
This plot shows the ExtVCOin sensitivity which applies only when the device is being used in External VCO
mode.
Variation over voltage is typically very small and on the order of less than ± 1 dB.
Figure 19. SINE wave ExtVCOin Sensitivity
Marker 1:
50 MHz
Marker 2:
100 MHz
Marker 3:
500 MHz
Marker 4:
1000 MHz
Start 50 MHz
Stop 1000 MHz
1
XO = 1 ₄
2
3
2
XO = 0
4
3
FREQUENCY
(MHz)
1
5
10
20
30
40
Figure 20. OSCin Input Impedance
Table 8. OSCin Frequency
OSCin (NORMAL MODE)
OSCin (XO MODE)
REAL
3945.3
4846.0
4253.4
2295.3
1290.0
847.9
IMAGINARY
2261.6
–189.6
–1850.1
–2366.9
–2087.0
–1716.1
REAL
9452.3
2397.9
428.2
248.4
187.1
163.5
IMAGINARY
2182.1
–916.7
–1105.7
–591.8
–410.1
–313.3
OSCin# (NORMAL MODE)
REAL
3975.5
4890.1
4297.4
2288.6
1304.3
855.5
IMAGINARY
2287.0
–150.1
–1886.7
–2383.8
–2079.1
–1718.0
20
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