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參數(shù)資料
| 型號(hào)： | LMX2346SLBX/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 2000 MHz, CQCC16 |
| 封裝： | LEAD FREE, CSP-16 |
| 文件頁數(shù)： | 17/27頁 |
| 文件大?。?/td> | 597K |
| 代理商： | LMX2346SLBX/NOPB |
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2.0 Programming Description (Continued)
2.2.5 R_OPT[2:0]
Reference Oscillator Optimization
R[17:15]
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.
R_OPT[2:0]
Optimization Frequency
Range
0
5 MHz–50 MHz
7
50 MHz–104 MHz
1-6
Reserved — Do not use.
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
SHIFT REGISTER BIT LOCATION
Least Significant Bit
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Data Field
ADDR
N
NB_CNTR [9:0]
NA_CNTR [4:0]
PD [1:0]
0
2.3.1 PD[1:0]
Power-Down
N[2:1]
The PD control word is used to switch the device between the normal operating mode and various power-down modes.
PD [1:0]
Operating Mode
0
Normal Operation
1
Synchronous Power-down
2
Counter Reset
3
Asynchronous Power-down
2.3.2 NA_CNTR[4:0]
A Counter
N[7:3]
The NA_CNTR control word is used to program the A counter. The A counter 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 Value
NA_CNTR[4:0]
0
00000
1
00001
31
11111
2.3.3 NB_CNTR[9:0]
B Counter
N[17:8]
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 Value
NB_CNTR[9:0]
3
0000000011
4
0000000100
1023
1111111111
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| LMX2346TM | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PLLatinum⑩ Frequency Synthesizer for RF Personal Communications |
| LMX2346TM/NOPB | 功能描述:IC FREQ SYNTH 2.0GHZ 16TSSOP RoHS:是 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:* |
| LMX2346TMX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PLLatinum⑩ Frequency Synthesizer for RF Personal Communications |
| LMX2346TMX/NOPB | 功能描述:IC FREQ SYNTH 2.0GHZ RF 16-TSSOP RoHS:是 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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