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參數資料
| 型號： | LMX2434TM |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | XO, clock |
| 英文描述： | PLLatinum Dual High Frequency Synthesizer for RF Personal Communications |
| 中文描述： | PLL FREQUENCY SYNTHESIZER, 5000 MHz, PDSO20 |
| 封裝： | PLASTIC, TSSOP-20 |
| 文件頁數： | 46/49頁 |
| 文件大小： | 943K |
| 代理商： | LMX2434TM |
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2.0 Programming Description
(Continued)
2.9 R5 REGISTER
The R5 Register contains the IF_TOC control word. The IF_TOC is used to setup the IF syhnthesizer’s Fastlock circuitry. The
IF_TOC is a 12-bit binary counter programmable from 0 to 4095.
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
R5
0
0
0
0
0
0
0
0
0
IF_TOC[11:0]
1
0
1
2.9.1 IF_TOC[0:11] - IF Synthesizer Timeout Counter (R5[14:3])
The OSCout/ FLoutIF pin can be configured as a general purpose CMOS TRI-STATE output or as a Fastlock output by
programming the IF_TOC appropriately. When the IF_TOC is programmed from 0 to 3, Automatic Fastlock is disabled, and the
OSCout/ FLoutIF pin is configured as a general purpose CMOS TRI-STATE output or Manual Fastlock is enabled. When the
IF_TOC is programmed to 0, the OSCout/ FLoutIF pin will be in TRI-STATE (high impedance) mode. The charge pump current
is then the value specified by IF_CPG (R3[19]). When the IF_TOC is programmed to 1, the OSCout/ FLoutIF pin is pulled to a
LOW state. The charge pump current is then set to a HIGH gain state (IF_CPG bit = 1). This condition is known as the Manual
Fastlock. When the IF_TOC is programmed to 2, the OSCout/ FLout_IF pin will again be pulled to a LOW state, but this time the
charge pump current is the value specified by IF_CPG (R3[19]). When the IF_TOC is programmed to 3, the OSCout/ FLoutIF pin
is pulled to a HIGH state. Again, the charge pump current is the value specified by IF_CPG (R3[19]). When the IF_TOC is
programmed from 4 to 4095, Fastlock is enabled and the OSCout/ FLoutIF pin is pulled to a LOW state. Fastlock will time-out after
the specified number of PFD events. At this time, the OSCout/ FLoutIF pin will switch to TRI-STATE (high impedance) mode. The
value programmed into IF_TOC represents the number of PFD events that the IF synthesizer will spend in the Fastlock state.
Note that any write to the IF_TOC requires a PFD event on the IF synthesizer to latch the contents. This means that writes to the
IF_TOC take effect synchronously with the next PFD event.
IF_TOC[11:0]
FastLock Mode
Fastlock Period
[PFD Events]
N/A
OSCout/ FLoutIF Pin
Functionality/ State
General Purpose.
High Impedance State
General Purpose.
Logic LOW State
General Purpose.
Logic LOW State
General Purpose.
Logic HIGH State
FastLock.
Logic LOW State.
Switches to High
Impedance after 4 PFD
events
…
FastLock.
Logic LOW State.
Switches to High
Impedance after 4095
PFD events
I
CPoutIF
Magnitude
0
Disabled
I
CPoutIF
magnitude
controlled by R3[19]
I
CPoutIF
= 4 mA
1
Enabled
Manual Fastlock
Disabled
N/A
2
N/A
I
CPoutIF
magnitude
controlled by R3[19]
I
CPoutIF
magnitude
controlled by R3[19]
I
CPoutIF
= 4 mA
Switches to 1 mA after
4 PFD events
3
Disabled
N/A
4
Enabled
Automatic Fastlock
4
…
…
…
…
4095
Enabled
Automatic Fastlock
4095
I
CPoutIF
= 4 mA
Switches to 1 mA after
4095 PFD events
L
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LMX2434TM/NOPB | 功能描述:鎖相環 - PLL 5.0Ghz High Freq Dual Pll RoHS:否 制造商:Silicon Labs 類型:PLL Clock Multiplier 電路數量: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 |
| LMX2434TMX | 功能描述:鎖相環 - PLL RoHS:否 制造商:Silicon Labs 類型:PLL Clock Multiplier 電路數量: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 |
| LMX2434TMX/NOPB | 功能描述:鎖相環 - PLL RoHS:否 制造商:Silicon Labs 類型:PLL Clock Multiplier 電路數量: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 |
| LMX2470 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:2.6 GHz Delta-Sigma Fractional-N PLL with 800 MHz Integer-N PLL |
| LMX2470EVAL | 功能描述:時鐘和定時器開發工具 LMX2470 EVAL BOARD RoHS:否 制造商:Texas Instruments 產品:Evaluation Modules 類型:Clock Conditioners 工具用于評估:LMK04100B 頻率:122.8 MHz 工作電源電壓:3.3 V |
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