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參數(shù)資料
| 型號(hào)： | LMX2512LQX0967/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 19.68 MHz, QCC28 |
| 封裝： | 5 X 5 MM, 0.75 MM HEIGHT, LLP-28 |
| 文件頁(yè)數(shù)： | 4/18頁(yè) |
| 文件大小： | 184K |
| 代理商： | LMX2512LQX0967/NOPB |
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Programming Description (Continued)
RF N Counter Setting:
Counter Name
Symbol
Function
Modulus Counter
RF_FN
RF N Divider
N = Prescaler x RF_B + RF_A + (RF_FN / f
OSC)x10
4
Programmable
Counter
RF_B
Swallow Counter
RF_A
Pulse Swallow Function:
f
VCO = {Prescaler x RF_B + RF_A + (RF_FN / fOSC)x10
4}xf
OSC where (RF_A < RF_B)
where
f
VCO: Output frequency of voltage controlled oscillator (VCO)
Prescaler Values:
Device Type
RF Prescaler
LMX2502
8
LMX2512
6
RF_B: Preset divide ratio of binary 4-bit programmable counter (2
≤ RF_B ≤ 15)
RF_A: Preset divide ratio of binary 3-bit swallow counter (0
≤ RF_A ≤ 7 for LMX2502, 0 ≤ RF_A ≤ 5 for LMX2512)
RF_FN: Preset numerator of binary 11-bit modulus counter (0
≤ RF_FN < 1920 for f
OSC = 19.20 MHz; 0
≤ RF_FN < 1968 for f
OSC
= 19.68 MHz).
f
OSC: Reference oscillator frequency
NOTE: For the use of reference frequencies other than those specified, please contact National Semiconductor.
LMX2502/LMX2512
www.national.com
12
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