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參數(shù)資料
| 型號： | LMX2430TM |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | XO, clock |
| 英文描述： | PLLatinum Dual High Frequency Synthesizer for RF Personal Communications |
| 中文描述： | PLL FREQUENCY SYNTHESIZER, 3000 MHz, PDSO20 |
| 封裝： | PLASTIC, TSSOP-20 |
| 文件頁數(shù)： | 44/49頁 |
| 文件大小： | 943K |
| 代理商： | LMX2430TM |
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2.0 Programming Description
(Continued)
2.7.3 IF_CPG - IF Synthesizer Charge Pump Current Gain (R3[19])
The IF_CPG bit controls the IF synthesizer’s charge pump gain. Two gain levels are available.
Control Bit
Register Location
Description
Function
0
1
IF_CPG
R3[19]
IF Charge Pump
Current Gain
LOW
1 mA
HIGH
4 mA
2.7.4 IF_CPT - IF Synthesizer Charge Pump TRI-STATE (R3[20])
The IF_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 IF_CPT bit.
Furthermore, the IF_CPT bit operates in conjuction with the IF_PD bit to set a synchronous or an asynchronous powerdown
mode. Refer to
Section 2.8.4
for more details on how to program the IF_PD bit.
Control Bit
Register Location
Description
Function
0
1
IF_CPT
R3[20]
IF Charge Pump
TRI-STATE
IF Charge Pump
Normal Operation
IF Charge Pump
Output in High
Impedance State
2.7.5 IF_RST - IF Synthesizer Counter Reset (R3[21])
The IF_RST bit resets of the IF_A, IF_B and IF_R counters. After removing the reset, the IF_A and IF_B counters resume
counting in close alignment with the IF_R counter. The maximum error is one prescaler cycle.
Control Bit
Register Location
Description
Function
0
1
IF_RST
R3[21]
IF Counter Reset
IF_A, IF_B and IF_R
Normal Operation
IF_A, IF_B and IF_R
Reset
2.8 R4 REGISTER
The R4 register contains the IF_A, IF_B, IF_P, and IF_PD control words. The IF_A and IF_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. R4[21] is always set to 0.
Reg
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
DATA[20:0] FIELD
ADDRESS
[2:0]
FIELD
R4
IF_
PD
IF_
P
0
IF_B[13:0]
IF_A[3:0]
1
0
0
2.8.1 IF_A[3:0] - IF Synthesizer Swallow Counter (A Counter) (R4[6:3])
The IF_A control word is used to setup the IF synthesizer’s A counter. The A counter is a 4-bit swallow counter used in the
programmable feedback divider. The IF_A control word can be programmed to values ranging from 0 to 15.
Divide Ratio
IF_A[3:0]
3
0
0
1
2
0
0
1
1
0
0
1
0
0
1
1
0
1
15
L
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