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LMX2336UTM Datasheet(PDF) 40 Page - National Semiconductor (TI) |
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LMX2336UTM Datasheet(HTML) 40 Page - National Semiconductor (TI) |
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40 / 48 page  2.0 Programming Description (Continued) 2.5.4 PWDN RF2 RF2 SYNTHESIZER POWERDOWN RF2 N[21] The PWDN RF2 bit is used to switch the RF2 PLL between a powered up and powered down mode. Furthermore, the PWDN RF2 bit operates in conjuction with the TRI-STATE ID o RF2 bit to set a synchronous or an asynchronous powerdown mode. Control Bit Register Location Description Function 01 PWDN RF2 RF2 N[21] RF2 Powerdown RF2 PLL Active RF2 PLL Powerdown 2.6 RF1 R REGISTER The RF1 R register contains the RF1 R_CNTR, PD_POL RF1, ID o RF1, and TRI-STATE IDo RF1 control words, in addition to two bits that compose the F oLD control word. The detailed description and programming information for each control word is discussed in the following sections. Reg. Most Significant Bit SHIFT REGISTER BIT LOCATION Least Significant Bit 21 20 19 18 17 16 15 14 13 12 11 10 9876543210 Data Field Address Field RF1 R FoLD1 FoLD3 TRI- STATE IDo RF1 IDo RF1 PD_ POL RF1 RF1 R_CNTR[14:0] 1 0 2.6.1 RF1 R_CNTR[14:0] RF1 SYNTHESIZER PROGRAMMABLE REFERENCE DIVIDER (R COUNTER) RF1 R[2:16] The RF1 reference divider (RF1 R_CNTR) can be programmed to support divide ratios from 3 to 32767. Divide ratios less than 3 are prohibited. Divide Ratio RF1 R_CNTR[14:0] 14 13 12 11 10 9876543210 3 000000000000011 4 000000000000100 • ••••••••••••••• 32767 111111111111111 2.6.2 PD_POL RF1 RF1 SYNTHESIZER PHASE DETECTOR POLARITY RF1 R[17] The PD_POL RF1 bit is used to control the RF1 synthesizer’s phase detector polarity based on the VCO tuning characteristics. Control Bit Register Location Description Function 01 PD_POL RF1 RF1 R[17] RF1 Phase Detector Polarity RF1 VCO Negative Tuning Characteristics RF1 VCO Positive Tuning Characteristics RF1 VCO Characteristics 10136782 www.national.com 40 |
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