參數(shù)資料
型號(hào)： LMX2377UTMX
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： XO, clock
英文描述： PLLatinum⑩ Ultra Low Power Dual Frequency Synthesizer for RF Personal Communications
中文描述： PLL FREQUENCY SYNTHESIZER, 2500 MHz, PDSO20
封裝： PLASTIC, TSSOP-20
文件頁(yè)數(shù)： 37/44頁(yè)
文件大?。?/td> 3181K
代理商： LMX2377UTMX
2.0 Programming Description
(Continued)
2.4.4 TRI-STATE ID
o
Aux
The TRI-STATE ID
o
Aux 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
Aux bit.
Furthermore, the TRI-STATE ID
o
Aux bit operates in conjuction with the PWDN Aux bit to set a synchronous or an asynchronous
powerdown mode.
AUXILIARY SYNTHESIZER CHARGE PUMP TRI-STATE CURRENT
Aux R[19]
Control Bit
Register Location
Description
Function
0
1
TRI-STATE ID
o
Aux
Aux R[19]
Aux Charge Pump
TRI-STATE Current
Aux Charge Pump
Normal Operation
Aux Charge Pump
Output in High
Impedance State
2.5 AUXILIARY N REGISTER
The Aux N register contains the Aux N_CNTRA, Aux N_CNTRB, PRE Aux, and PWDN Aux control words. The Aux N_CNTRA
and Aux 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
Aux
N
PWDN
Aux
PRE
Aux
Aux N_CNTRB[12:0]
Aux N_CNTRA[4:0]
0
1
2.5.1 Aux N_CNTRA[4:0]
The Aux N_CNTRA control word is used to setup the Aux synthesizer’s A counter. The A counter is a 5-bit swallow counter used
in the programmable feedback divider. The Aux N_CNTRA control word can be programmed to values ranging from 0 to 31.
AUXILIARY SYNTHESIZER SWALLOW COUNTER (A COUNTER)
Aux N[2:6]
Divide Ratio
Aux N_CNTRA[4:0]
2
0
0
1
4
0
0
1
3
0
0
1
1
0
0
1
0
0
1
1
0
1
31
2.5.2 Aux N_CNTRB[12:0]
Aux N[7:19]
The Aux N_CNTRB control word is used to setup the Aux synthesizer’s B counter. The B counter is a 13-bit programmable binary
counter used in the programmable feedback divider. TheAux N_CNTRB control word can be programmed to values ranging from
3 to 8191.
AUXILIARY SYNTHESIZER PROGRAMMABLE BINARY COUNTER (B COUNTER)
Divide
Ratio
Aux N_CNTRB[12:0]
7
6
0
0
0
0
1
1
12
0
0
1
11
0
0
1
10
0
0
1
9
0
0
1
8
0
0
1
5
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
8191
L
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相關(guān)PDF資料
PDF描述
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LMX2377USLBX PLLatinum⑩ Ultra Low Power Dual Frequency Synthesizer for RF Personal Communications
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