參數(shù)資料
型號(hào)： LMX2434
廠商： National Semiconductor Corporation
英文描述： PLLatinum Dual High Frequency Synthesizer for RF Personal Communications
中文描述： PLLatinum雙高頻率合成射頻個(gè)人通信
文件頁(yè)數(shù)： 44/49頁(yè)
文件大?。?/td> 943K
代理商： LMX2434
2.0 Programming Description
(Continued)
2.7.3 IF_CPG - IF Synthesizer Charge Pump Current Gain (R3[19])
The IF_CPG bit controls the IF synthesizer’s charge pump gain. Two gain levels are available.
Control Bit
Register Location
Description
Function
0
1
IF_CPG
R3[19]
IF Charge Pump
Current Gain
LOW
1 mA
HIGH
4 mA
2.7.4 IF_CPT - IF Synthesizer Charge Pump TRI-STATE (R3[20])
The IF_CPT 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 IF_CPT bit.
Furthermore, the IF_CPT bit operates in conjuction with the IF_PD bit to set a synchronous or an asynchronous powerdown
mode. Refer to
Section 2.8.4
for more details on how to program the IF_PD bit.
Control Bit
Register Location
Description
Function
0
1
IF_CPT
R3[20]
IF Charge Pump
TRI-STATE
IF Charge Pump
Normal Operation
IF Charge Pump
Output in High
Impedance State
2.7.5 IF_RST - IF Synthesizer Counter Reset (R3[21])
The IF_RST bit resets of the IF_A, IF_B and IF_R counters. After removing the reset, the IF_A and IF_B counters resume
counting in close alignment with the IF_R counter. The maximum error is one prescaler cycle.
Control Bit
Register Location
Description
Function
0
1
IF_RST
R3[21]
IF Counter Reset
IF_A, IF_B and IF_R
Normal Operation
IF_A, IF_B and IF_R
Reset
2.8 R4 REGISTER
The R4 register contains the IF_A, IF_B, IF_P, and IF_PD control words. The IF_A and IF_B control words are used to setup the
programmable feedback divider. The detailed descriptions and programming information for each control word is discussed in the
following sections. R4[21] is always set to 0.
Reg
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
DATA[20:0] FIELD
ADDRESS
[2:0]
FIELD
R4
IF_
PD
IF_
P
0
IF_B[13:0]
IF_A[3:0]
1
0
0
2.8.1 IF_A[3:0] - IF Synthesizer Swallow Counter (A Counter) (R4[6:3])
The IF_A control word is used to setup the IF synthesizer’s A counter. The A counter is a 4-bit swallow counter used in the
programmable feedback divider. The IF_A control word can be programmed to values ranging from 0 to 15.
Divide Ratio
IF_A[3:0]
3
0
0
1
2
0
0
1
1
0
0
1
0
0
1
1
0
1
15
L
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相關(guān)PDF資料
PDF描述
LMX2434TM PLLatinum Dual High Frequency Synthesizer for RF Personal Communications
LMX2434TMX PLLatinum Dual High Frequency Synthesizer for RF Personal Communications
LMX2430SLEX PLLatinum Dual High Frequency Synthesizer for RF Personal Communications
LMX2430TM PLLatinum Dual High Frequency Synthesizer for RF Personal Communications
LMX2430TMX PLLatinum Dual High Frequency Synthesizer for RF Personal Communications
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LMX2434EVAL 功能描述:時(shí)鐘和定時(shí)器開(kāi)發(fā)工具 LMX2434 EVAL BOARD RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Modules 類型:Clock Conditioners 工具用于評(píng)估:LMK04100B 頻率:122.8 MHz 工作電源電壓:3.3 V
LMX2434EVAL/NOPB 功能描述:時(shí)鐘和定時(shí)器開(kāi)發(fā)工具 LMX2434 EVAL BOARD RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Modules 類型:Clock Conditioners 工具用于評(píng)估:LMK04100B 頻率:122.8 MHz 工作電源電壓:3.3 V
LMX2434SLEX 制造商:Texas Instruments 功能描述:PLL Frequency Synthesizer Dual 500MHz to 5000MHz 20-Pin LAM UCSP T/R
LMX2434SLEX/NOPB 功能描述:鎖相環(huán) - PLL RoHS:否 制造商:Silicon Labs 類型:PLL Clock Multiplier 電路數(shù)量:1 最大輸入頻率:710 MHz 最小輸入頻率:0.002 MHz 輸出頻率范圍:0.002 MHz to 808 MHz 電源電壓-最大:3.63 V 電源電壓-最小:1.71 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:QFN-36 封裝:Tray
LMX2434TM 制造商:Texas Instruments 功能描述:PLL Frequency Synthesizer Dual 500MHz to 5000MHz 20-Pin TSSOP Rail
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