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參數(shù)資料
| 型號： | LMX2332UTMX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | XO, clock |
| 英文描述： | PLLatinum Ultra Low Power Dual Frequency Synthesizer for RF Personal Communications |
| 中文描述： | PLL FREQUENCY SYNTHESIZER, 1200 MHz, PDSO20 |
| 封裝： | 0.173 INCH, PLASTIC, TSSOP-20 |
| 文件頁數(shù)： | 37/42頁 |
| 文件大小： | 3318K |
| 代理商： | LMX2332UTMX |
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2.0 Programming Description
(Continued)
2.5.3 ID
o
RF
The ID
o
RF bit controls the RF synthesizer’s charge pump gain. Two current levels are available.
RF SYNTHESIZER CHARGE PUMP CURRENT GAIN
RF R[18]
Control Bit
Register Location
Description
Function
0
1
ID
o
RF
RF R[18]
RF Charge Pump
Current Gain
LOW
0.95 mA
HIGH
3.80 mA
2.5.4 TRI-STATE ID
o
RF
The TRI-STATE ID
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.
RF SYNTHESIZER CHARGE PUMP TRI-STATE CURRENT
RF R[19]
Control Bit
Register Location
Description
Function
0
1
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
2.6 IF N REGISTER
The IF N register contains the IF N_CNTRA, IF N_CNTRB, PRE IF, and PWDN IF control words. The IF N_CNTRA and IF
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
21
20
SHIFT REGISTER BIT LOCATION
13
12
11
10
Least Significant Bit
3
2
19
18
17
16
15
14
9
8
7
6
5
4
1
0
Data Field
Address
Field
IF
N
PWDN
IF
PRE
IF
IF N_CNTRB[10:0]
IF N_CNTRA[6:0]
1
0
2.6.1 IF N_CNTRA[6:0]
The IF N_CNTRA control word is used to setup the IF synthesizer’s A counter. The A counter is a 7-bit swallow counter used in
the programmable feedback divider. The IF N_CNTRAcontrol word can be programmed to values ranging from 0 to 15. The three
most significant bits are ‘don’t care bits’ in this case.
IF SYNTHESIZER SWALLOW COUNTER (A COUNTER)
IF N[2:8]
Divide Ratio
IF N_CNTRA[6:0]
3
0
0
1
6
X
X
X
5
X
X
X
4
X
X
X
2
0
0
1
1
0
0
1
0
0
1
1
0
1
15
2.6.2 IF N_CNTRB[10:0]
The IF N_CNTRB control word is used to setup the IF synthesizer’s B counter. The B counter is an 11-bit programmable binary
counter used in the programmable feedback divider. The IF N_CNTRB control word can be programmed to values ranging from
3 to 2047.
IF SYNTHESIZER PROGRAMMABLE BINARY COUNTER (B COUNTER)
IF N[9:19]
Divide
Ratio
IF N_CNTRB[10:0]
5
0
0
1
10
0
0
1
9
0
0
1
8
0
0
1
7
0
0
1
6
0
0
1
4
0
0
1
3
0
0
1
2
0
1
1
1
1
0
1
0
1
0
1
3
4
2047
L
www.national.com
37
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相關代理商/技術參數(shù) |
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| LMX2334ATMX | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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| LMX2335 WAF | 制造商:Texas Instruments 功能描述: |
| LMX2335L | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:無線通訊 |
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