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LMX2487 Datasheet(PDF) 31 Page - Texas Instruments |
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LMX2487 Datasheet(HTML) 31 Page - Texas Instruments |
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31 / 49 page  LMX2487 www.ti.com SNAS322C – FEBRUARY 2006 – REVISED JANUARY 2016 8.6.4.1 IF_R[11:0] – IF R Divider Value For the IF R divider, the R value is determined by the IF_R[11:0] bits in the R3 register. The minimum value for IF_R is 3. Table 24. IF PLL R Divider R IF_R[11:0] VALUE 3 0 0 0 0 0 0 0 0 0 0 1 1 ... . . . . . . . . . . . . 4095 1 1 1 1 1 1 1 1 1 1 1 1 8.6.4.2 RF_CPG – RF PLL Charge Pump Gain This is used to control the magnitude of the RF PLL charge pump in steady-state operation. Table 25. RF PLL Charge Pump Gain TYPICAL RF CHARGE PUMP CURRENT RF_CPG CHARGE PUMP STATE AT 3 V (µA) 0 1X 95 1 2X 190 2 3X 285 3 4X 380 4 5X 475 5 6X 570 6 7X 665 7 8X 760 8 9X 855 9 10X 950 10 11X 1045 11 12X 1140 12 13X 1235 13 14X 1330 14 15X 1425 15 16X 1520 8.6.4.3 Access – Register Access word It is mandatory that the first 5 registers R0-R4 be programmed. The programming of registers R5-R7 is optional. The ACCESS[3:0] bits determine which additional registers need to be programmed. Any one of these registers can be individually programmed. According to Table 26, when the state of a register is in default mode, all the bits in that register are forced to a default state and it is not necessary to program this register. When the register is programmable, it needs to be programmed through the MICROWIRE. Using this register access technique, the programming required is reduced up to 37%. Table 26. Access word ACCESS BIT REGISTER LOCATION REGISTER CONTROLLED ACCESS[0] R3[20] Must be set to 1 ACCESS[1] R3[21] R5 ACCESS[2] R3[22] R6 ACCESS[3] R3[23] R7 Copyright © 2006–2016, Texas Instruments Incorporated Submit Documentation Feedback 31 Product Folder Links: LMX2487 |
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