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LMX2336UTM Datasheet(PDF) 39 Page - National Semiconductor (TI) |
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LMX2336UTM Datasheet(HTML) 39 Page - National Semiconductor (TI) |
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39 / 48 page  2.0 Programming Description (Continued) 2.4.4 TRI-STATE ID o RF2 RF2 SYNTHESIZER CHARGE PUMP TRI-STATE CURRENT RF2 R[19] The TRI-STATE ID o RF2 bit allows the charge pump to be switched between a normal operating mode and a high impedance output state. This happens asynchronously with the change in the TRI-STATE ID o RF2 bit. Furthermore, the TRI-STATE ID o RF2 bit operates in conjuction with the PWDN RF2 bit to set a synchronous or an asynchronous powerdown mode. Control Bit Register Location Description Function 01 TRI-STATE ID o RF2 RF2 R[19] RF2 Charge Pump TRI-STATE Current RF2 Charge Pump Normal Operation RF2 Charge Pump Output in High Impedance State 2.5 RF2 N REGISTER The RF2 N register contains the RF2 N_CNTRA, RF2 N_CNTRB, PRE RF2, and PWDN RF2 control words. The RF2 N_CNTRA and RF2 N_CNTRB control words are used to setup the programmable feedback divider. 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 RF2 N PWDN RF2 PRE RF2 RF2 N_CNTRB[10:0] RF2 N_CNTRA[6:0] 0 1 2.5.1 RF2 N_CNTRA[6:0] RF2 SYNTHESIZER SWALLOW COUNTER (A COUNTER) RF2 N[2:8] The RF2 N_CNTRA control word is used to setup the RF2 synthesizer’s A counter. The A counter is a 7-bit swallow counter used in the programmable feedback divider. The RF2 N_CNTRA control word can be programmed to values ranging from 0 to 127. Divide Ratio RF2 N_CNTRA[6:0] 6543210 00000000 10000001 •••••••• 127 1111111 2.5.2 RF2 N_CNTRB[10:0] RF2 SYNTHESIZER PROGRAMMABLE BINARY COUNTER (B COUNTER) RF2 N[9:19] The RF2 N_CNTRB control word is used to setup the RF2 synthesizer’s B counter. The B counter is an 11-bit programmable binary counter used in the programmable feedback divider. The RF2 N_CNTRB control word can be programmed to values ranging from 3 to 2047. Divide Ratio RF2 N_CNTRB[10:0] 10 9876543210 300000000011 400000000100 •••••••••••• 2047 11111111111 2.5.3 PRE RF2 RF2 SYNTHESIZER PRESCALER SELECT RF2 N[20] The RF2 synthesizer utilizes a selectable dual modulus prescaler. Control Bit Register Location Description Function 01 PRE RF2 RF2 N[20] RF2 Prescaler Select 64/65 Prescaler Selected 128/129 Prescaler Selected www.national.com 39 |
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