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LMX2430 Datasheet(PDF) 40 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part No. LMX2430
Description  PLLatinum Dual High Frequency Synthesizer for RF Personal Communications
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LMX2430 Datasheet(HTML) 40 Page - National Semiconductor (TI)

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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
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