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LMX2531LQ1226E Datasheet(PDF) 7 Page - National Semiconductor (TI) |
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LMX2531LQ1226E Datasheet(HTML) 7 Page - National Semiconductor (TI) |
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7 / 25 page  LMX2531L Q 122 6E E V A L U A TION BO A RD OPER A T ING IN STRUCTIONS Free-Running VCO Phase Noise (Internal Divide by 2 Enabled) The plots to the left show the true phase noise capability of the VCO. In order to take these plots, the E5052 phase nose analyzer was used. The method was to lock the PLL to the proper frequency, then disable the EN_PLL, EN_PLLLDO1, and EN_PLLLDO2 bits. The equipment needs to be able to track the VCO phase noise to measure in this way, and one can not let the VCO drift too far off in frequency. If this kind of equipment is not available, the VCO phase noise can also be measured by making a very narrow loop bandwidth filter. When divide by 2 is enabled, the phase noise at lower offsets is about 6 dB better; but at high offsets, the phase noise improvement may be less because the divider is noise floor is adding to the phase noise. 7 |
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