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    參數(shù)資料
    

    


    


    
型號(hào)：
AD977ABR

    

    
廠商：
ANALOG DEVICES INC

    

    
元件分類：
ADC

    

    
英文描述：
16-Bit, 100 kSPS/200 kSPS BiCMOS A/D Converter

    

    
中文描述：
3-CH 16-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20

    

    
封裝：
SOIC-20

    

    
文件頁(yè)數(shù)：
18/24頁(yè)

    

    
文件大小：
284K

    

    
代理商：
AD977ABR


    

    

    

	
    
    
    

    
    
	
    AD977/AD977A
    –18–
    REV. D
    VOLTAGE REFERENCE
    The AD977/AD977A has an on-chip temperature compensated
    bandgap voltage reference that is factory trimmed to 2.5 V
    ±
    20 mV. The accuracy of the AD977/AD977A over the speci-
    fied temperature ranges is dominated by the drift performance
    of the voltage reference. The on-chip voltage reference is laser-
    trimmed to provide a typical drift of 7 ppm/
    °
    C. This typical drift
    characteristic is shown in Figure 14, which is a plot of the
    change in reference voltage (in mV) versus the change in tem-
    perature—notice the plot is normalized for zero error at 25
    °
    C.
    If improved drift performance is required, an external reference
    such as the AD780 should be used to provide a drift as low as
    3 ppm/
    °
    C. In order to simplify the drive requirements of the
    voltage reference (internal or external), an onboard reference
    buffer is provided. The output of this buffer is provided at the
    CAP pin and is available to the user; however, when externally
    loading the reference buffer, it is important to make sure that
    proper precautions are taken to minimize any degradation in the
    ADC’s performance. Figure 15 shows the load regulation of the
    reference buffer. Notice that this figure is also normalized so
    that there is zero error with no dc load. In the linear region, the
    output impedance at this point is typically 1 
    . Because of this
    1
     
     output impedance, it is important to minimize any ac or
    DEGREES CELSIUS
    –
    55
    1
    25
    125
    Figure 14. Reference Drift
    LOAD CURRENT 
    –
     5mA/DIV
    d
    –
    SOURCE CAPABILITY
     SINK CAPABILITY
    Figure 15. CAP Pin Load Regulation
    input dependent loads that will lead to increased distortion.
    Any dc loads will simply act as a gain error. Although the typi-
    cal characteristic of Figure 15 shows that the AD977/AD977A
    is capable of driving loads greater than 15 mA, it is recom-
    mended that the steady state current not exceed 2 mA.
    Using an External Reference
    In addition to the on-chip reference, an external 2.5 V refer-
    ence can be applied. When choosing an external reference for a
    16-bit application, however, careful attention should be paid to
    noise and temperature drift. These critical specifications can
    have a significant effect on the ADC performance.
    Figures 16a and 16b show the AD977/AD977A used in bipolar
    mode with the AD780 voltage reference applied to the REF
    pin. It is important to note that in Figure 16a the R3
    IN
     pin is
    connected to the CAP pin whereas in Figure 16b the R3
    IN
     pin
    of the AD977A is returned to the output of the external refer-
    ence. The AD780 is a bandgap reference that exhibits ultralow
    drift, low initial error and low output noise. In Figure 16b,
    the value for C1 is only applicable to applications using the
    AD780. In applications using a different external reference a
    different value for C1 may be required. For low power applica-
    tions, the REF192 provides a low quiescent current, high
    accuracy and low temperature drift solution.
    200
    V
    IN
    33.2k
    C2
    2.2 F
    R1
    IN
    R2
    IN
    R3
    IN
    REF
    AGND2
    CAP
    AGND1
    AD977
    V
    ANA
    C4
    0.1 F
    C1
    2.2 F
    C3
    1 F
    4
    GND
    6
    V
    OUT
    V
    IN
    TEMP
    AD780
    3
    2
    0.1 F
    5V
    100
    Figure 16a. AD780 External Reference to AD977 Config-
    ured for 
    ±
    10 V Input Range
    200
    V
    IN
    33.2k
    C2
    2.2 F
    R1
    IN
    R2
    IN
    R3
    IN
    REF
    AGND2
    CAP
    AGND1
    AD977A
    V
    ANA
    C4
    0.1 F
    C1
    330 F
    *
    C3
    1 F
    4
    GND
    6
    V
    OUT
    V
    IN
    TEMP
    AD780
    3
    2
    0.1 F
    5V
    100
    *
    ESR AT 100kHz MUST BE LESS THAN 0.3 .
      RECOMMEND KEMET T495 SERIES OR
      SANYO 6SA330M.
    Figure 16b. AD780 External Reference to AD977A Config-
    ured for 
    ±
    10 V Input Range
    
    
    
    
    
    


    


    

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