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參數(shù)資料
| 型號： | LMX2347TM |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | XO, clock |
| 英文描述： | PLLatinum⑩ Frequency Synthesizer for RF Personal Communications |
| 中文描述： | PLL FREQUENCY SYNTHESIZER, 2500 MHz, PDSO16 |
| 封裝： | TSSOP-16 |
| 文件頁數(shù)： | 24/27頁 |
| 文件大小： | 606K |
| 代理商： | LMX2347TM |
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2.0 Programming Description
(Continued)
2.2.5 R_OPT[2:0]
The R_OPT control words are used to optimize the performance of the reference buffer circuit for best Phase Noise and power
consumption performance based on the frequency of the reference source.
Reference Oscillator Optimization
R[17:15]
R_OPT[2:0]
Optimization Frequency
Range
5 MHz–50 MHz
50 MHz–104 MHz
Reserved—Do not use.
0
7
1-6
2.3 N REGISTER
The N register contains the PD (Power-Down), NA_CNTR, and NB_CNTR control words. The NA_CNTR, and NB_CNTR control
words are used to setup the programmable feedback divider. The PWR-DN control word is used to switch the device between the
normal operating mode and various power-down modes.
Register
Most Significant Bit
17
16
SHIFT REGISTER BIT LOCATION
10
9
Data Field
NB_CNTR [9:0]
Least Significant Bit
2
1
15
14
13
12
11
8
7
6
5
4
3
0
ADDR
0
N
NA_CNTR [4:0]
PD [1:0]
2.3.1 PD[1:0]
The PD control word is used to switch the device between the normal operating mode and various power-down modes.
Power-Down
N[2:1]
PD [1:0]
0
1
2
3
Operating Mode
Normal Operation
Synchronous Power-down
Counter Reset
Asynchronous Power-down
2.3.2 NA_CNTR[4:0]
The NA_CNTR control word is used to program theAcounter. TheAcounter is a 5-bit swallow counter used in the programmable
feedback divider. The A counter can be programmed to values ranging from 0 to 31. See Section 1.4 for details on how the value
of the A counter should be selected.
A Counter
N[7:3]
A Counter Value
0
1
31
NA_CNTR[4:0]
0
0
1
0
0
1
0
0
1
0
0
1
0
1
1
2.3.3 NB_CNTR[9:0]
The NB_CNTR control word is used to program the B counter. The B counter is a 10-bit binary counter used in the programmable
feedback divider. The B counter can be programmed to values ranging from 3 to 1023. See Section 1.4 for details on how the
value of the B counter should be selected.
B Counter
N[17:8]
B Counter Value
3
4
1023
NB_CNTR[9:0]
0
0
1
0
0
1
0
0
1
0
0
1
0
0
1
0
0
1
0
0
1
0
1
1
1
0
1
1
0
1
L
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| LMX2347TMX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PLLatinum⑩ Frequency Synthesizer for RF Personal Communications |
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| LMX2350 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PLLatinum TM Fractional N RF / Integer N IF Dual Low Power Frequency Synthesizer |
| LMX2350SLBX | 功能描述:IC FREQ SYNTH DUAL 24LAMINATECSP RoHS:否 類別:集成電路 (IC) >> 時(shí)鐘/計(jì)時(shí) - 時(shí)鐘發(fā)生器，PLL，頻率合成器 系列:PLLatinum™ 標(biāo)準(zhǔn)包裝:39 系列:- 類型:* PLL:帶旁路 輸入:時(shí)鐘 輸出:時(shí)鐘 電路數(shù):1 比率 - 輸入:輸出:1:10 差分 - 輸入:輸出:是/是 頻率 - 最大:170MHz 除法器/乘法器:無/無 電源電壓:2.375 V ~ 3.465 V 工作溫度:0°C ~ 70°C 安裝類型:* 封裝/外殼:* 供應(yīng)商設(shè)備封裝:* 包裝:* |
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