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  • 參數(shù)資料
    型號(hào): AD629AR
    廠商: Analog Devices Inc
    文件頁數(shù): 2/16頁
    文件大?。?/td> 0K
    描述: IC AMP DIFF 25MA LDRIFT 8SOIC
    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: 98
    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: 200µV
    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: 表面貼裝
    封裝/外殼: 8-SOIC(0.154",3.90mm 寬)
    供應(yīng)商設(shè)備封裝: 8-SO
    包裝: 管件
    AD629
    Rev. C | Page 10 of 16
    THEORY OF OPERATION
    The AD629 is a unity gain, differential-to-single-ended
    amplifier (diff amp) that can reject extremely high common-
    mode signals (in excess of 270 V with 15 V supplies). It consists
    of an operational amplifier (op amp) and a resistor network.
    To achieve high common-mode voltage range, an internal
    resistor divider (Pin 3 or Pin 5) attenuates the noninverting
    signal by a factor of 20. Other internal resistors (Pin 1, Pin 2,
    and the feedback resistor) restore the gain to provide a differential
    gain of unity. The complete transfer function equals
    VOUT = V (+IN) V (IN)
    Laser wafer trimming provides resistor matching so that
    common-mode signals are rejected while differential input
    signals are amplified.
    To reduce output drift, the op amp uses super beta transistors
    in its input stage. The input offset current and its associated
    temperature coefficient contribute no appreciable output
    voltage offset or drift, which has the added benefit of reducing
    voltage noise because the corner where 1/f noise becomes
    dominant is below 5 Hz. To reduce the dependence of gain
    accuracy on the op amp, the open-loop voltage gain of the op
    amp exceeds 20 million, and the PSRR exceeds 140 dB.
    1
    2
    3
    4
    8
    7
    6
    5
    21.1k
    380k
    20k
    REF(–)
    –IN
    +IN
    –VS
    NC
    +VS
    OUTPUT
    REF(+)
    AD629
    NC = NO CONNECT
    0
    078
    3-
    0
    01
    Figure 31. Functional Block Diagram
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