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SNAU136 Datasheet(PDF) 3 Page - Texas Instruments |
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SNAU136 Datasheet(HTML) 3 Page - Texas Instruments |
3 / 29 page 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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