Datasheet

1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 1.E+07 1.E+08
PHASE NOISE (dBc/Hz)
-130
-120
-110
-100
-90
-80
-70
-140
-160
-150
OFFSET (Hz)
V
I
= 3.3 mRad
(F
PD
= 50 MHz)
V
I
= 3.0 mRad
(OSCin Scaled to Freq.)
V
I
= 2.8 mRad
(F
PD
= 100 MHz)
1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 1.E+07 1.E+08
PHASE NOISE (dBc/Hz)
-130
-120
-110
-100
-90
-80
-70
-140
-160
-150
OFFSET (Hz)
V
I
= 5.8 mRad
(F
PD
= 50 MHz)
V
I
= 5.1 mRad
(OSCin Scaled to Freq.)
V
I
= 5.1 mRad
(F
PD
= 100 MHz)
LMX2541SQ2060E, LMX2541SQ2380E
LMX2541SQ2690E, LMX2541SQ3030E
LMX2541SQ3320E, LMX2541SQ3740E
SNOSB31I –JULY 2009–REVISED FEBRUARY 2013 www.ti.com
Typical Performance Characteristics (Not Guaranteed) (continued)
LMX2541SQ3320E System Phase Noise
For this plot, a third order modulator with dithering disabled was used with a fractional denominator of 500000. The charge pump gain was
32X and the loop filter components were C1 = 2.2 nF, C2 = 22 nF, R2 = 470 Ω. The internal loop filter components were C3_LF = 20 pF,
C4_LF = 100 pF, R3_LF = 1 kΩ, R4_LF = 200 Ω. The VCO frequency is 3320.1 MHz. The OSCin signal was a 500 MHz differential LVPECL
output of the LMK04033.
Figure 4.
LMX2541SQ3740E System Phase Noise
For this plot, a third order modulator with dithering disabled was used with a fractional denominator of 500000. The charge pump gain was
32X and the loop filter components were C1 = 2.2 nF, C2 = 22 nF, R2 = 470 Ω. The internal loop filter components were C3_LF = 20 pF,
C4_LF = 100 pF, R3_LF = 1 kΩ, R4_LF = 200 Ω. The VCO frequency is 3840.2 MHz, but the VCO Divider is set to two, so the RFout
frequency is 1720.1 MHz. The OSCin signal was a 500 MHz differential LVPECL output of the LMK04033.
Figure 5.
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Product Folder Links: LMX2541SQ2060E LMX2541SQ2380E LMX2541SQ2690E LMX2541SQ3030E
LMX2541SQ3320E LMX2541SQ3740E