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LMX2541SQX3740E Datasheet(PDF) 2 Page - Texas Instruments |
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LMX2541SQX3740E Datasheet(HTML) 2 Page - Texas Instruments |
2 / 64 page Dirty Input Clock PLL LMK04000 (Clock Jitter Cleaner) Clean Reference Clock Ultra-Clean Local Oscillator LMX2541 (RF Synthesizer) PLL LMX2541SQ2060E, LMX2541SQ2380E LMX2541SQ2690E, LMX2541SQ3030E LMX2541SQ3320E, LMX2541SQ3740E SNOSB31I – JULY 2009 – REVISED FEBRUARY 2013 www.ti.com System Diagram LMX2541 Frequency Coverage 2060E 2380E 2690E 3030E 3320E 3740E VCO _DIV Start Stop Start Stop Start Stop Start Stop Start Stop Start Stop 1 1990.0 2240.0 2200.0 2530.0 2490.0 2865.0 2810.0 3230.0 3130.0 3600.0 3480.0 4000.0 2 995.0 1120.0 1100.0 1265.0 1245.0 1432.5 1405.0 1615.0 1565.0 1800.0 1740.0 2000.0 3 663.3 746.7 733.3 843.3 830.0 955.0 936.7 1076.7 1043.3 1200.0 1160.0 1333.3 4 497.5 560.0 550.0 632.5 622.5 716.3 702.5 807.5 782.5 900.0 870.0 1000.0 5 398.0 448.0 440.0 506.0 498.0 573.0 562.0 646.0 626.0 720.0 696.0 800.0 6 331.7 373.3 366.7 421.7 415.0 477.5 468.3 538.3 521.7 600.0 580.0 666.7 7 284.3 320.0 314.3 361.4 355.7 409.3 401.4 461.4 447.1 514.3 497.1 571.4 8 248.8 280.0 275.0 316.3 311.3 358.1 351.3 403.8 391.3 450.0 435.0 500.0 … … … … … … … … … … … … … 63 31.6 35.6 34.9 40.2 39.5 45.5 44.6 51.3 49.7 57.1 55.2 63.5 All devices have continuous frequency coverage below a divide value of 8 (7 for most devices) down to their minimum frequency achievable with divide by 63. The numbers in bold show the upper end of this minimum continuous frequency range. For instance, the LMX2541SQ3740E option offers continuous frequency coverage from 55.2 MHz to 571.4 MHz and LMX2541SQ2060E offers continuous frequency coverage from 31.6 MHz to 280 MHz. If using the part in External VCO mode, all parts have roughly the same performance and any option will do. Determining the Best Frequency Option of the LMX2541 to Use When there are multiple devices that can satisfy the frequency requirement, performance characteristics can sometimes be used to make a decision. Consider the following example of where an output frequency of 1200 to 1250 MHz is desired with a channel spacing of 100 kHz. From the frequency table, the LMX2541SQ2380E could be used with a divide value of 2, or the LMX2541SQ3740E option could be used with a divide value of 3. This raises the question: Which one has better performance? The following table is helpful in comparing the performance. Performance What Makes it Why Characteristic Better Fractional spurs at the VCO are independent of VCO frequency, but when the VCO frequency is divided down by a factor of VCO_DIV, the fractional spurs improve by a factor of 20·log(VCO_DIV). Fractional Spurs Also, the fractional channel spacing can be made wider at the VCO, which makes the fractional spurs Larger Value and farther from the carrier. of VCO_DIV Fraction Noise The fractional noise of the modulator is divided down in a similar way as fractional spurs. In applications where this is dominant, this larger division can have an impact. Consult the applications section for more information on the fractional phase noise. 2 Submit Documentation Feedback Copyright © 2009–2013, Texas Instruments Incorporated Product Folder Links: LMX2541SQ2060E LMX2541SQ2380E LMX2541SQ2690E LMX2541SQ3030E LMX2541SQ3320E LMX2541SQ3740E |
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