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參數(shù)資料
| 型號： | 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)： | 36/48頁 |
| 文件大?。?/td> | 3127K |
| 代理商： | LMX2335UTM/NOPB |
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2.0 Programming Description (Continued)
2.6.3 ID
o RF1
RF1 SYNTHESIZER CHARGE PUMP CURRENT GAIN
RF1 R[18]
The ID
o RF1 bit controls the RF1 synthesizer’s charge pump gain. Two current levels are available.
Control Bit
Register Location
Description
Function
01
ID
o RF1
RF1 R[18]
RF1 Charge Pump
Current Gain
LOW
0.95 mA
HIGH
3.80 mA
2.6.4 TRI-STATE ID
o RF1
RF1 SYNTHESIZER CHARGE PUMP TRI-STATE CURRENT
RF1 R[19]
The TRI-STATE ID
o RF1 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 RF1 bit.
Furthermore, the TRI-STATE ID
o RF1 bit operates in conjuction with the PWDN RF1 bit to set a synchronous or an asynchronous
powerdown mode.
Control Bit
Register Location
Description
Function
01
TRI-STATE ID
o RF1
RF1 R[19]
RF1 Charge Pump
TRI-STATE Current
RF1 Charge Pump
Normal Operation
RF1 Charge Pump
Output in High
Impedance State
2.7 RF1 N REGISTER
The RF1 N register contains the RF1 N_CNTRA, RF1 N_CNTRB, PRE RF1, and PWDN RF1 control words. The RF1 N_CNTRA
and RF1 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
RF1
N
PWDN
RF1
PRE
RF1
RF1 N_CNTRB[10:0]
RF1 N_CNTRA[6:0]
1
2.7.1 RF1 N_CNTRA[6:0]
RF1 SYNTHESIZER SWALLOW COUNTER (A COUNTER)
RF1 N[2:8]
The RF1 N_CNTRA control word is used to setup the RF1 synthesizer’s A counter. The A counter is a 7-bit swallow counter used
in the programmable feedback divider. The RF1 N_CNTRA control word can be programmed to values ranging from 0 to 127.
Divide Ratio
RF1 N_CNTRA[6:0]
6543210
00000000
10000001
127
1111111
2.7.2 RF1 N_CNTRB[10:0]
RF1 SYNTHESIZER PROGRAMMABLE BINARY COUNTER (B COUNTER)
RF1 N[9:19]
The RF1 N_CNTRB control word is used to setup the RF1 synthesizer’s B counter. The B counter is an 11-bit programmable
binary counter used in the programmable feedback divider. The RF1 N_CNTRB control word can be programmed to values
ranging from 3 to 2047.
Divide
Ratio
RF1 N_CNTRB[10:0]
10
9876543210
300000000011
400000000100
2047
11111111111
LMX2335U/LMX2336U
www.national.com
41
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