starting from the converter VCC 
            


    
    



    

    
  
    
    
    
    
  
    
  
  

    





 
 




 
 


    

    
    


    參數(shù)資料
    

    


    


    
型號(hào)：
LTC2451ITS8#TRPBF

    

    
廠(chǎng)商：
Linear Technology

    

    
文件頁(yè)數(shù)：
5/20頁(yè)

    

    
文件大?。?/td>
0K

    

    
描述：
IC ADC 16BIT DELTA SIG TSOT23-8

    

    
標(biāo)準(zhǔn)包裝：
2,500

    

    
位數(shù)：
16
    		

    

    
采樣率（每秒）：
60
    		

    

    
數(shù)據(jù)接口：
I²C，串行
    		

    

    
轉(zhuǎn)換器數(shù)目：
1
    		

    

    
功率耗散（最大）：
1.2mW
    		

    

    
電壓電源：
單電源
    		

    

    
工作溫度：
-40°C ~ 85°C
    		

    

    
安裝類(lèi)型：
表面貼裝
    		

    

    
封裝/外殼：
SOT-23-8 薄型，TSOT-23-8
    		

    

    
供應(yīng)商設(shè)備封裝：
TSOT-23-8
    		

    

    
包裝：
帶卷 (TR)
    		

    

    
輸入數(shù)目和類(lèi)型：
1 個(gè)單端，單極
    		

    

    
配用：
DC1383A-A-ND - BOARD DELTA SIGMA ADC LTC2451
    		

    

    

    

	
    
    
    

    
    
	
    LTC2451
    13
    2451fg
    It is also desirable to avoid any via in the circuit path,
    starting from the converter VCCpin,passingthroughthese
    two decoupling capacitors, and returning to the converter
    GND pin. The area encompassed by this circuit path, as
    well as the path length, should be minimized.
    Very low impedance ground and power planes, and star
    connections at both VCC and GND pins, are preferable. The
    VCC pin should have three distinct connections: the first to
    the decoupling capacitors described above, the second to
    the ground return for the input signal source, and the third
    to the ground return for the power supply voltage source.
    Driving REF+ and REF–
    A simplified equivalent circuit for REF+ and REF– is shown
    in Figure 10. Like all other A/D converters, the LTC2451
    is only as accurate as the reference it is using. Therefore,
    it is important to keep the reference line quiet by careful
    low and high frequency power supply decoupling.
    The LT6660 reference is an ideal match for driving the
    LTC2451’s REF+ pin. The LTC6660 is available in a 2mm
    × 2mm DFN package with 2.5V, 3V, 3.3V and 5V options.
    Figure 10. LTC2451 Analog Input and
    Reference Pins Equivalent Circuit
    A 0.1F, high quality, ceramic capacitor in parallel with
    a 10F ceramic capacitor should be connected between
    the REF+/REF– and GND pins, as close as possible to the
    package. The 0.1F capacitor should be placed closest
    to the ADC.
    Driving IN
    The input drive requirements can best be analyzed using
    the equivalent circuit of Figure 11. The input signal, VSIG,is
    connected to the ADC input pin (IN) through an equivalent
    sourceresistanceRS.Thisresistorincludesboththeactual
    generator source resistance and any additional optional
    resistors connected to the input pin. An optional input
    capacitor, CIN, is also connected between the ADC input
    pin and GND. This capacitor is placed in parallel with the
    ADC input parasitic capacitance, CPAR. Depending on the
    PCB layout, CPARhastypicalvaluesbetween2pFand15pF.
    In addition, the equivalent circuit of Figure 11 includes the
    converter equivalent internal resistor, RSW, and sampling
    capacitor, CEQ.
    APPLICATIONS INFORMATION
    VCC
    CEQ
    0.35pF
    (TYP)
    REF+
    IN
    REF–
    2451 F10
    RSW
    15k
    (TYP)
    ILEAK
    RSW
    15k
    (TYP)
    ILEAK
    RSW
    15k
    (TYP)
    ILEAK
    Figure 11. LTC2451 Input Drive Equivalent Circuit
    VSIG
    2451 F11
    ILEAK
    RSW
    15k
    (TYP)
    ICONV
    CIN
    IN
    VCC
    RS
    CEQ
    0.35pF
    (TYP)
    CPAR
    +–
    
    
    
    
    
    


    


    

    相關(guān)PDF資料
    		

    PDF描述
    		

    
    

    
LTC2452ITS8#TRPBF
IC ADC 16BIT DELTA SIG TSOT23-8

    

    
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IC ADC 16BIT DELTA SIG TSOT23-8

    

    
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IC ADC 16BIT 10-DFN

    

    
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LTC2485CDD#TRPBF
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LTC2452CDDB#TRPBF
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