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SNAU136 Datasheet(PDF) 3 Page - Texas Instruments

Part No. SNAU136
Description  The Texas Instruments LMX2581EVM evaluation module (EVM) helps designers evaluate the operation and performance of the LMX2581 Wideband Frequency Synthesizer.
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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SNAU136 Datasheet(HTML) 3 Page - Texas Instruments

 
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Setup
November 2012
SNAU136A
3
Loop Filter Values
Parameter
LMX2581
100 MHz OSCin
VCO Frequency
(MHz)
1850 - 3760
VCO Gain (MHz/V), VCO Core 1
15–25
VCO Gain (MHz/V), VCO Core 2
18 - 32
VCO Gain (MHz/V), VCO Core 3
23 - 40
VCO Gain (MHz/V), VCO Core 4
26 - 46
Loop Bandwidth (kHz)
28.7
Phase Margin (deg)
49.7
C1_LF (nF)
1.8
C2_LF (nF)
56
C3_LF (nF)
3.3
C4_LF (nF)
Open
R2 (kΩ)
0.390
R3_LF (kΩ)
0.270
R4_LF (kΩ)
0
Charge Pump Gain
2400 uA
Phase Detector Frequency (MHz)
20
OSCin Frequency (MHz)
100
1. Table 2 - Loop Filter Values
The datasheet advises that the capacitor next to the VCO input (C3_LF in this case) should be at least 3.3
nF. The LMX2581 will certainly work for lower values, but this can cause phase noise degradation at
farther offsets if this capacitor is too small.
Installing the EVM Software
Go to http://www.ti.com/tool/codeloader
Click on the download button to download the software.
Run the executable file.
Burning in the Crystal Oscillator
The LMX2581 comes with a crystal oscillator on the board. This crystal oscillator was
chosen because it has good phase noise, standard package, and most importantly it is
readily available. However, it is not necessarily the most accurate and does require to be
burnt in. This is not done before the boards are shipped. To burn in the crystal, all one has
to do is hook up the evaluation board and leave power applied.
This improves crystal
stability and also phase noise at low offsets below 1 kHz.


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