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LMX2541SQE3740E Datasheet(PDF) 3 Page - Texas Instruments |
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LMX2541SQE3740E Datasheet(HTML) 3 Page - Texas Instruments |
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3 / 64 page  VCO VREG Charge Pump Fast Lock I DATA CLK LE CE FRAC VREG VregVCO VrefVCO OSCin OSCin* RFout Vtune CPout FLout Ftest/LD MUX 2-63 Divider Modulus Control 4/5 Prescaler Comp N Divider RFoutEN VregFRAC 2X R Divider MUX Serial Interface Control ExtVCOin RFout VREG LMX2541SQ2060E, LMX2541SQ2380E LMX2541SQ2690E, LMX2541SQ3030E LMX2541SQ3320E, LMX2541SQ3740E www.ti.com SNOSB31I – JULY 2009 – REVISED FEBRUARY 2013 Performance What Makes it Why Characteristic Better Operating in the lower VCO Phase At the lower end of the tuning range, the VCO phase noise is less because the tuning gain is less. This frequency Noise provides better phase noise, even accounting for the difference in frequency. range of the VCO Considering the fractional spurs and phase noise, the channel spacing at the 2380E VCO would be 200 kHz. When this is divided by two, the offset of these spurs does not change and the spurs at the VCO output would be reduced by a factor of 20·log(2) = 6 dB. The channel spacing at the 3740E VCO would be 300 kHz and these spurs would be reduced by a factor of 20·log(3) = 9.5 dB. So the spurs of the 3740E option would probably be better by virtue of the fact that they are farther from the carrier and easier to filter and also that they are divided down more by the VCO divider. The fractional phase noise would also be (9.5 - 6) = 3.5 dB better by the same reasoning. Now consider the VCO phase noise. For the 3740E option, 1200 - 1250 MHz corresponds to a VCO frequency of 3600 - 3750 MHz, which is closer to the lower end of the tuning range for this device. For the 2380E option, this would correspond to 2400 - 2500 MHz, which is closer to the higher end of the tuning range. To verify this, take the phase noise numbers from the electrical specifications, extrapolate them to the actual frequencies, and then subtract a factor of 20·log(VCO_DIV). For the 2380E option, this works out to -116 dBc/Hz at 1200 MHz and - 115.4 dBc/Hz at 1250 MHz. For the 3740E option, this works out to -117.4 dBc/Hz at 1200 MHz and -116.9 dBc/Hz at 1250 MHz. Functional Block Diagram Copyright © 2009–2013, Texas Instruments Incorporated Submit Documentation Feedback 3 Product Folder Links: LMX2541SQ2060E LMX2541SQ2380E LMX2541SQ2690E LMX2541SQ3030E LMX2541SQ3320E LMX2541SQ3740E |
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