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LMK61E08 датащи(PDF) 42 Page - Texas Instruments |
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LMK61E08 датащи(HTML) 42 Page - Texas Instruments |
42 / 54 page 42 LMK61E08 SNAS805 – JUNE 2020 www.ti.com Submit Documentation Feedback Copyright © 2020, Texas Instruments Incorporated Table 4. Spur and Mitigation Techniques SPUR TYPE OFFSET WAYS TO REDUCE TRADE-OFFS Phase Detector fPD Reduce Phase Detector Frequency. Although reducing the phase detector frequency does improve this spur, it also degrades phase noise. Integer Boundary fVCO mod fPD Methods for PLL Dominated Spurs Reducing the loop bandwidth may degrade the total integrated noise if the bandwidth is too narrow. - Avoid the worst case VCO frequencies if possible. - Ensure good slew rate and signal integrity at reference input. - Reduce loop bandwidth or add more filter poles to suppress out of band spurs. Methods for VCO Dominated Spurs Reducing the phase detector may degrade the phase noise. - Avoid the worst case VCO frequencies if possible. - Reduce Phase Detector Frequency. - Ensure good slew rate and signal integrity at reference input. Primary Fractional fPD/DEN - Decrease Loop Bandwidth. Decreasing the loop bandwidth may degrade in-band phase noise. Also, larger unequivalent fractions don’t always reduce spurs. - Change Modulator Order. - Use Larger Unequivalent Fractions. Sub-Fractional fPD/DEN/k k=2,3, or 6 - Use Dithering. Dithering and larger fractions may increase phase noise. - Use Larger Equivalent Fractions. - Use Larger Unequivalent Fractions. - Reduce Modulator Order. - Eliminate factors of 2 or 3 in denominator. 9.2.2.3 Device Programming The EVM software tool TICS Pro/Oscillator Programming Tool can be used to program the device with the desired configuration. Simply select the Program EEPROM option and the software will automatically load the current configuration to EEPROM. The settings will then be available upon subsequent startup without the need to reload the registers over I2C. 9.2.3 Application Curves Figure 34. Increasing Output Frequency in DCXO Mode Figure 35. Decreasing Output Frequency in DCXO Mode |
Аналогичный номер детали - LMK61E08 |
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Аналогичное описание - LMK61E08 |
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