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  • 參數(shù)資料
    型號(hào): AD629BNZ
    廠商: Analog Devices Inc
    文件頁(yè)數(shù): 5/16頁(yè)
    文件大?。?/td> 0K
    描述: IC AMP DIFF 25MA LDRIFT 8DIP
    產(chǎn)品培訓(xùn)模塊: Top Five Instrumentation Amplifier Problems
    設(shè)計(jì)資源: Measuring -48 V High-Side Current Using AD629, AD8603, AD780, and AD7453 (CN0100)
    標(biāo)準(zhǔn)包裝: 50
    放大器類型: 差分
    電路數(shù): 1
    轉(zhuǎn)換速率: 2.1 V/µs
    -3db帶寬: 500kHz
    電壓 - 輸入偏移: 100µV
    電流 - 電源: 900µA
    電流 - 輸出 / 通道: 25mA
    電壓 - 電源,單路/雙路(±): 5 V ~ 36 V,±2.5 V ~ 18 V
    工作溫度: -40°C ~ 85°C
    安裝類型: 通孔
    封裝/外殼: 8-DIP(0.300",7.62mm)
    供應(yīng)商設(shè)備封裝: 8-PDIP
    包裝: 管件
    產(chǎn)品目錄頁(yè)面: 771 (CN2011-ZH PDF)
    AD629
    Rev. C | Page 13 of 16
    OUTPUT CURRENT AND BUFFERING
    The AD629 is designed to drive loads of 2 kΩ to within 2 V of
    the rails but can deliver higher output currents at lower output
    voltages (see Figure 17). If higher output current is required, the
    output of the AD629 should be buffered with a precision op amp,
    such as the OP113, as shown in Figure 38. This op amp can swing
    to within 1 V of either rail while driving a load as small as 600 Ω.
    REF (–)
    REF (+)
    –VS
    +VS
    VOUT
    NC
    –IN
    +IN
    0.1F
    NC = NO CONNECT
    21.1k
    380k
    20k
    380k
    AD629
    1
    2
    3
    4
    8
    7
    6
    5
    007
    83-
    0
    36
    OP113
    Figure 38. Output Buffering Application
    A GAIN OF 19 DIFFERENTIAL AMPLIFIER
    While low level signals can be connected directly to the –IN and
    +IN inputs of the AD629, differential input signals can also be
    connected, as shown in Figure 39, to give a precise gain of 19.
    However, large common-mode voltages are no longer permissible.
    Cold junction compensation can be implemented using a
    temperature sensor, such as the AD590.
    REF (–)
    REF (+)
    +VS
    NC
    –IN
    +IN
    0.1F
    NC = NO CONNECT
    21.1k
    380k
    20k
    380k
    AD629
    1
    2
    3
    4
    8
    7
    6
    5
    00
    783
    -037
    VOUT
    VREF
    THERMOCOUPLE
    Figure 39. A Gain of 19 Thermocouple Amplifier
    ERROR BUDGET ANALYSIS EXAMPLE 1
    In the dc application that follows, the 10 A output current from
    a device with a high common-mode voltage (such as a power
    supply or current-mode amplifier) is sensed across a 1 Ω shunt
    resistor (see Figure 40). The common-mode voltage is 200 V,
    and the resistor terminals are connected through a long pair of
    lead wires located in a high noise environment, for example,
    50 Hz/60 Hz, 440 V ac power lines. The calculations in Table 7
    assume an induced noise level of 1 V at 60 Hz on the leads, in
    addition to a full-scale dc differential voltage of 10 V. The error
    budget table quantifies the contribution of each error source.
    Note that the dominant error source in this example is due to
    the dc common-mode voltage.
    REF (–)
    OUTPUT
    CURRENT
    60Hz
    POWER LINE
    1
    SHUNT
    REF (+)
    –VS
    +VS
    VOUT
    NC
    –IN
    +IN
    0.1F
    NC = NO CONNECT
    21.1k
    380k
    20k
    380k
    AD629
    1
    2
    3
    4
    8
    7
    6
    5
    0
    78
    3
    -03
    8
    10 AMPS
    200VCMDC
    TO GROUND
    Figure 40. Error Budget Analysis Example 1: VIN = 10 V Full-Scale,
    VCM = 200 V DC, RSHUNT = 1 Ω, 1 V p-p, 60 Hz Power-Line Interference
    Table 7. AD629 vs. INA117 Error Budget Analysis Example 1 (VCM = 200 V dc)
    Error, ppm of FS
    Error Source
    AD629
    INA117
    AD629
    INA117
    ACCURACY, TA = 25°C
    Initial Gain Error
    (0.0005 × 10)/10 V × 106
    500
    Offset Voltage
    (0.001 V/10 V) × 106
    (0.002 V/10 V) × 106
    100
    200
    DC CMR (Over Temperature)
    (224 × 10-6 × 200 V)/10 V × 106
    (500 × 10-6 × 200 V)/10 V × 106
    4480
    10,000
    Total Accuracy Error
    5080
    10,700
    TEMPERATURE DRIFT (85°C)
    Gain
    10 ppm/°C × 60°C
    600
    Offset Voltage
    (20 μV/°C × 60°C) × 106/10 V
    (40 μV/°C × 60°C) × 106/10 V
    120
    240
    Total Drift Error
    720
    840
    RESOLUTION
    Noise, Typical, 0.01 Hz to 10 Hz, μV p-p
    15 μV/10 V × 106
    25 μV/10 V × 106
    2
    3
    CMR, 60 Hz
    (141 × 10-6 × 1 V)/10 V × 106
    (500 × 10-6 × 1 V)/10 V × 106
    14
    50
    Nonlinearity
    (10-5 × 10 V)/10 V × 106
    10
    Total Resolution Error
    26
    63
    Total Error
    5826
    11,603
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