參數(shù)資料
型號(hào): LMX2532
廠商: National Semiconductor Corporation
英文描述: PLLatinum Frequency Synthesizer System with Integrated VCOs
中文描述: PLLatinum頻率合成系統(tǒng)的集成和VCO
文件頁(yè)數(shù): 12/18頁(yè)
文件大小: 189K
代理商: LMX2532
Programming Description
(Continued)
RF N Counter Setting:
Counter Name
Modulus Counter
Programmable
Counter
Swallow Counter
Symbol
RF_FN
RF_B
Function
RF N Divider
N = Prescaler x RF_B + RF_A + (RF_FN / f
OSC
) 10
4
RF_A
Pulse Swallow Function:
f = {Prescaler x RF_B + RF_A + (RF_FN / f
OSC
) x 10
4
} x f
OSC
where (RF_A
<
RF_B)
where
f
VCO
: Output frequency of voltage controlled oscillator (VCO)
Prescaler Values:
Device Type
LMX2522
LMX2532
RF Prescaler
8
6
GPS Prescaler
6
8
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 prescaler of 8 or 0
RF_A
5 for prescaler of 6)
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.
L
www.national.com
12
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