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LM4935RLEVAL Datasheet(PDF) 23 Page - Texas Instruments |
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LM4935RLEVAL Datasheet(HTML) 23 Page - Texas Instruments |
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23 / 91 page ![]() LM4935, LM4935RLEVAL www.ti.com SNAS296D – OCTOBER 2005 – REVISED MARCH 2006 4.2.6 PLL N DIVIDER CONFIGURATION REGISTER This register is used to control the feedback divider of the PLL. Table 4-7. PLL_N (0x03h) Bits Field Description 7:0 PLL_N Programs the PLL feedback divider as follows: PLL_N Feedback Divider Value 0 to 10 10 11 11 12 12 13 13 14 14 … … 249 249 250 to 255 250 The N divider should be set such that the output of the divider is between 0.5 MHz and 5 MHz. (Fin/M)*N will be the target resting VCO frequency, FVCO. The N divider should be set such that 40 MHz < (Fin/M)*N < 60 MHz. Fin/M is often referred to as Fcomp (comparison frequency) or Fref (reference frequency), in this document Fcomp is used. The integer division of the N divider is derived from PLL_N such that: For 9 < PLL_N < 251: N = PLL_N (2) NOTE See Section 4.2.9 for further details. 4.2.7 PLL P DIVIDER CONFIGURATION REGISTER This register is used to control the output divider of the PLL. Table 4-8. PLL_P (0x04h) Bits Field Description 0 RSVD RESERVED 3:1 PLL_P PLL_P Output Divider Value 0002 1 0012 2 0102 3 0112 4 1002 5 1012 6 1102 7 1112 8 Copyright © 2005–2006, Texas Instruments Incorporated Application Information 23 Submit Documentation Feedback Product Folder Links: LM4935 LM4935RLEVAL |
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