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參數(shù)資料
| 型號(hào)： | LMX2335UTM/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 1200 MHz, PDSO16 |
| 封裝： | PLASTIC, TSSOP-16 |
| 文件頁數(shù)： | 33/48頁 |
| 文件大?。?/td> | 3127K |
| 代理商： | LMX2335UTM/NOPB |
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2.0 Programming Description (Continued)
2.4.4 TRI-STATE ID
o RF2
RF2 SYNTHESIZER CHARGE PUMP TRI-STATE CURRENT
RF2 R[19]
The TRI-STATE ID
o RF2 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 RF2 bit.
Furthermore, the TRI-STATE ID
o RF2 bit operates in conjuction with the PWDN RF2 bit to set a synchronous or an asynchronous
powerdown mode.
Control Bit
Register Location
Description
Function
01
TRI-STATE ID
o RF2
RF2 R[19]
RF2 Charge Pump
TRI-STATE Current
RF2 Charge Pump
Normal Operation
RF2 Charge Pump
Output in High
Impedance State
2.5 RF2 N REGISTER
The RF2 N register contains the RF2 N_CNTRA, RF2 N_CNTRB, PRE RF2, and PWDN RF2 control words. The RF2 N_CNTRA
and RF2 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
RF2
N
PWDN
RF2
PRE
RF2
RF2 N_CNTRB[10:0]
RF2 N_CNTRA[6:0]
0
1
2.5.1 RF2 N_CNTRA[6:0]
RF2 SYNTHESIZER SWALLOW COUNTER (A COUNTER)
RF2 N[2:8]
The RF2 N_CNTRA control word is used to setup the RF2 synthesizer’s A counter. The A counter is a 7-bit swallow counter used
in the programmable feedback divider. The RF2 N_CNTRA control word can be programmed to values ranging from 0 to 127.
Divide Ratio
RF2 N_CNTRA[6:0]
6543210
00000000
10000001
127
1111111
2.5.2 RF2 N_CNTRB[10:0]
RF2 SYNTHESIZER PROGRAMMABLE BINARY COUNTER (B COUNTER)
RF2 N[9:19]
The RF2 N_CNTRB control word is used to setup the RF2 synthesizer’s B counter. The B counter is an 11-bit programmable
binary counter used in the programmable feedback divider. The RF2 N_CNTRB control word can be programmed to values
ranging from 3 to 2047.
Divide
Ratio
RF2 N_CNTRB[10:0]
10
9876543210
300000000011
400000000100
2047
11111111111
2.5.3 PRE RF2
RF2 SYNTHESIZER PRESCALER SELECT
RF2 N[20]
The RF2 synthesizer utilizes a selectable dual modulus prescaler.
Control Bit
Register Location
Description
Function
01
PRE RF2
RF2 N[20]
RF2 Prescaler Select
64/65 Prescaler
Selected
128/129 Prescaler
Selected
LMX2335U/LMX2336U
www.national.com
39
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