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參數(shù)資料
| 型號(hào)： | LMX2332UTMX/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 1200 MHz, PDSO20 |
| 封裝： | 0.173 INCH, PLASTIC, TSSOP-20 |
| 文件頁數(shù)： | 40/49頁 |
| 文件大?。?/td> | 4568K |
| 代理商： | LMX2332UTMX/NOPB |
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2.0 Programming Description (Continued)
2.6.3 ID
o RF
RF Synthesizer Charge Pump Current Gain
RF R[18]
The ID
o RF bit controls the RF synthesizer’s charge pump gain. Two current levels are available.
Control Bit
Register Location
Description
Function
01
ID
o RF
RF R[18]
RF Charge Pump
Current Gain
LOW
0.95 mA
HIGH
3.80 mA
2.6.4 TRI-STATE ID
o RF
RF Synthesizer Charge Pump TRI-STATE Current
RF R[19]
The TRI-STATE ID
o RF 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 RF bit.
Furthermore, the TRI-STATE ID
o RF bit operates in conjuction with the PWDN RF bit to set a synchronous or an asynchronous
powerdown mode.
Control Bit
Register Location
Description
Function
01
TRI-STATE ID
o RF
RF R[19]
RF Charge Pump
TRI-STATE Current
RF Charge Pump
Normal Operation
RF Charge Pump
Output in High
Impedance State
2.7 RF N REGISTER
The RF N register contains the RF N_CNTRA, RF N_CNTRB, PRE RF, and PWDN RF control words. The RF N_CNTRA and RF
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
RF
N
PWDN
RF
PRE
RF
RF N_CNTRB[10:0]
RF N_CNTRA[6:0]
1
2.7.1 RF N_CNTRA[6:0]
RF Synthesizer Swallow Counter (A Counter)
RF N[2:8]
The RF N_CNTRA control word is used to setup the RF synthesizer’s A counter. The A counter is a 7-bit swallow counter used
in the programmable feedback divider. The RF N_CNTRA control word can be programmed to values ranging from 0 to 127.
Divide Ratio
RF N_CNTRA[6:0]
6543210
00000000
10000001
127
1111111
2.7.2 RF N_CNTRB[10:0]
RF Synthesizer Programmable Binary Counter (B Counter)
RF N[9:19]
The RF N_CNTRB control word is used to setup the RF synthesizer’s B counter. The B counter is an 11-bit programmable binary
counter used in the programmable feedback divider. The RF N_CNTRB control word can be programmed to values ranging from
3 to 2047.
Divide
Ratio
RF N_CNTRB[10:0]
10
9876543210
300000000011
400000000100
2047
11111111111
LMX2330U/LMX2331U/LMX2332U
www.national.com
45
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| LMX2332UTM/NOPB | PLL FREQUENCY SYNTHESIZER, 1200 MHz, PDSO20 |
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