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参数资料
| 型号： | LMX2377UTM/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 2500 MHz, PDSO20 |
| 封装： | PLASTIC, TSSOP-20 |
| 文件页数： | 31/44页 |
| 文件大小： | 3181K |
| 代理商： | LMX2377UTM/NOPB |
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2.0 Programming Description (Continued)
2.4.4 TRI-STATE ID
o Aux
AUXILIARY SYNTHESIZER CHARGE PUMP TRI-STATE CURRENT
Aux R[19]
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.
Control Bit
Register Location
Description
Function
01
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
SHIFT REGISTER BIT LOCATION
Least Significant Bit
21
20
19
18
17
16
15
14
13
12
11
10
9876543210
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]
AUXILIARY SYNTHESIZER SWALLOW COUNTER (A COUNTER)
Aux N[2:6]
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.
Divide Ratio
Aux N_CNTRA[4:0]
43210
000000
100001
31
11111
2.5.2 Aux N_CNTRB[12:0]
AUXILIARY SYNTHESIZER PROGRAMMABLE BINARY COUNTER (B COUNTER)
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. The Aux N_CNTRB control word can be programmed to values ranging from
3 to 8191.
Divide
Ratio
Aux N_CNTRB[12:0]
12
11
10
9
876543210
3000
0
000000011
4000
0
000000100
8191
1
111111111
LMX2377U
www.national.com
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