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LMX2430 Datasheet(PDF) 40 Page - National Semiconductor (TI) |
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LMX2430 Datasheet(HTML) 40 Page - National Semiconductor (TI) |
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40 / 49 page  2.0 Programming Description (Continued) 2.4.3 RF_CPG - RF Synthesizer Charge Pump Current Gain (R0[19]) The RF_CPG bit controls the RF synthesizer’s charge pump gain. Two gain levels are available. Control Bit Register Location Description Function 01 RF_CPG R0[19] RF Charge Pump Current Gain LOW 1mA HIGH 4mA 2.4.4 RF_CPT - RF Synthesizer Charge Pump TRI-STATE (R0[20]) The RF_CPT 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 RF_CPT bit. Furthermore, the RF_CPT bit operates in conjuction with the RF_PD bit to set a synchronous or an asynchronous powerdown mode. Refer to Section 2.5.4 for more details on how to program the RF_PD bit. Control Bit Register Location Description Function 01 RF_CPT R0[20] RF Charge Pump TRI-STATE RF Charge Pump Normal Operation RF Charge Pump Output in High Impedance State 2.4.5 RF_RST - RF Synthesizer Counter Reset (R0[21]) The RF_RST bit resets the RF_A, RF_B and RF_R counters. After removing the reset, the RF_A and RF_B counters resume counting in close alignment with the RF_R counter. The maximum error is one prescaler cycle. Control Bit Register Location Description Function 01 RF_RST R0[21] RF Counter Reset RF_A, RF_B and RF_R Normal Operation RF_A, RF_B and RF_R Reset 2.5 R1 REGISTER The R1 register contains the RF_A, RF_B, RF_P, and RF_PD control words. The RF_A and RF_B control words are used to setup the programmable feedback divider. The detailed descriptions and programming information for each control word is discussed in the following sections. Reg 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9876543210 DATA[20:0] FIELD ADDRESS [2:0] FIELD R1 RF_ PD RF_ P LMX2430/33 RF_B[14:0] LMX2430/33 RF_A[3:0] 001 R1 RF_ PD RF_ P LMX2434 RF_B[13:0] LMX2434 RF_A[4:0] 001 2.5.1 LMX243x RF Synthesizer Swallow Counter 2.5.1.1 RF_A[3:0] - LMX2430/33 RF Synthesizer Swallow Counter (A Counter) (R1[6:3]) The RF_A control word is used to setup the RF synthesizer’s A counter. For both the LMX2430 and LMX2433, the A counter is a 4-bit swallow counter used in the programmable feedback divider. The RF_A control word can be programmed to values ranging from 0 to 15. Divide Ratio LMX2430/33 RF_A[3:0] 321 0 0 000 0 1 000 1 • ••• • 15 111 1 www.national.com 40 |
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