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    參數(shù)資料
    

    


    


    
型號(hào)：
PS2500

    

    
廠商：
Electronic Theatre Controls, Inc.

    

    
元件分類(lèi)：
XO, clock

    

    
英文描述：
Low-Power Direct Digital Modulation Frequency Synthesizer

    

    
中文描述：
低功耗直接數(shù)字調(diào)制頻率合成器

    

    
文件頁(yè)數(shù)：
9/28頁(yè)

    

    
文件大?。?/td>
184K

    

    
代理商：
PS2500


    

    

    

	
    
    
    

    
    
	
    PS2500 2.2 GHz Fractional-N Frequency Synthesizer
    - 9 -
    Philsar Semiconductor Inc.
    146 Colonnade Road S.
    Nepean, Ontario, Canada
    K2E 7Y1
    Tel: 613-274-0922
    Fax: 613-274-0915
    www.philsar.com
    PMP-001-DS2  V1.2
    Integer-N Applications
    The desired division ratio for the Main or Auxiliary Synthesizer is given by:
    N
    integer
     = F
    VCO_main 
    / F
    div_ref
    where 
    N
    integer
     is an integer number from 32 and 543 for both the main and auxiliary synthesizers.
    The value to be programmed in the 
    Main or Auxiliary Divider Register
     is given by: 
    N
    reg 
    = N
    integer
     - 32
    When in integer mode, allowed values for 
    N
    reg
     are from 0 and 511 for both the main and auxiliary 
    synthesizers.
    Note: 
    As with all integer-N synthesizers, the minimum step size is related to the crystal frequency and
    reference frequency division ratio.
    Integer-N Example
    Case 1:
     To achieve a desired frequency 
    F
    VCO_aux
     of 400 MHz using a crystal frequency of 16 MHz.
    Since the minimum divide ratio is 32, the reference frequency must be a maximum of 12.5 MHz. Choosing 
    a reference frequency divide ratio of 2 provides us with a reference frequency 
    F
    div_ref
     of 8 MHz. 
    Therefore, using:
    N
    integer 
    = F
    VCO_aux
     / F
    div_ref
    = 400 / 8
    = 50
    The value to be programmed in the 
    Auxiliary Divider Register
     is: 
    N
    reg 
    = N
    integer
     - 32
    = 50 - 32
    = 18
    = 0 0001 0010 (binary)
    Summarizing, 
     Auxiliary Divider Register = 0 0001 0010
    Register Loading Order
    In applications where the main synthesizer is in 18-bit mode, the 
    Main Dividend MSB Register 
    holds the 10 
    MSBs of the 
    dividend
     and the 
    Main Dividend LSB Register 
    holds the
    8 LSBs of the 
    dividend
    . The order in 
    which the registers controlling the main synthesizer’s divide ratio are to be loaded is:
     Main Divider Register
     Main Dividend LSB Register
    
    
    
    
    
    


    


    

    相關(guān)PDF資料
    		

    PDF描述
    		

    
    

    
PS2500AIT
Low-Power Direct Digital Modulation Frequency Synthesizer

    

    
PS2501L-1M-F3
NPN-OUTPUT DC-INPUT OPTOCOUPLER

    

    
PS2501L-1M-F4
NPN-OUTPUT DC-INPUT OPTOCOUPLER

    

    
PS2501L-1N-E3
NPN-OUTPUT DC-INPUT OPTOCOUPLER

    

    
PS2501L-1N-E4
NPN-OUTPUT DC-INPUT OPTOCOUPLER

    

    

    

    


    


    

    相關(guān)代理商/技術(shù)參數(shù)
    		

    參數(shù)描述
    		

    
    

    
PS250085PG
 制造商:TINNERMAN 功能描述:

    

    
PS250085S0H
 制造商:TINNERMAN 功能描述:

    

    
PS2500AA
 制造商:SENSORTECHNICS 制造商全稱(chēng):Sensortechnics GmbH 功能描述:OEM silicon stainless steel pressure sensor

    

    
PS2500AC
 制造商:SENSORTECHNICS 制造商全稱(chēng):Sensortechnics GmbH 功能描述:OEM silicon stainless steel pressure sensor

    

    
PS2500AIT
 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Low-Power Direct Digital Modulation Frequency Synthesizer

    

    
    
    
    
	
    	
    
    
     
     
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