BC29D7A35-CO7 驱动器控制DCS系统输入输出扩展 BALDOR

产品标题：BC29D7A35-CO7 驱动器控制DCS系统输入输出扩展 BALDOR

型号：BC29D7A35-CO7 驱动器控制DCS系统输入输出扩展  

品牌：  BALDOR

质保：七天验收期，质保期一年

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AD620与另一个运算放大器和两个电阻器一起，
制造密电流源（图40）。运算放大器
缓冲参考端子以保持良好的CMR。这个
AD620的输出电压VX出现在R1两端，其中
将其转换为电流。该电流，仅小于输入偏压
40.密电压-电流转换器（工作在1.8 mA±3 V）增益选择AD620增益由RG或更多电阻器编程
确地说，通过引脚1和8之间出现的阻抗。AD620设计为使用0.1%到1%的电阻提供确增益。表5显示了各种增益所需的RG值。注意，对于G=1，RG引脚未连接（RG=∞). 对于任意增益，RG可以使用nimize增益误差计算，避免串联的高寄生电阻
具有RG；为了小化增益漂移，RG应具有低于10 ppm/°C的低TC，以获得佳性能。表5.增益电阻要求值1%标准表RG（Ω）计算值0.1%标准值RG（ω）计算值49.9 k 1.990 49.3 k 2.002
12.4 k 4.984 12.4 k 4.9845.49 k 9.998 5.49 k 9.9982.61 k 19.93 2.61 k 19.931.00 k 50.40 1.01 k 49.9199 100.0 499 100.0249 199.4 249 199.4100 495.0 98.8 501.049.9 991.0 49.3 1003.0输入和输出偏移电压
AD620的低误差归因于两个来源，
输入和输出错误。输入时，输出误差除以G。在实践中，输入误差占主导地位
并且输出误差在低增益时占主导。这个
给定增益的总VOS计算如下：
总误差RTI=输入误差+（输出误差/G）
总误差RTO=（输入误差×G）+输出误差
参考终端
参考端子电位定义了零输出电压，当负载与系统其他部分不共享确接地时尤其有用。它提供了一种直接向输出注入确偏移的方法，在电源电压范围内允许2V。寄生电阻应为小值，以获得佳CMR。
输入保护AD620可安全承受±60 mA的输入电流：
在室温下几个小时。这适用于所有增益和通电和断电，如果信号源和放大器单独供电，这很有用。对于较长时间段，输入电流不应超过6 mA。
对于电源以外的输入电压，保护电阻器
应与每个输入串联，以限制当前tomA。这些电阻器可以与RFIfilter中使用的电阻器相同。高电阻值会影响系统的噪声和ACCMRR性能。低泄漏二极管（如BAV199）可采用plaThe AD620, along with another op amp and two resistors,
makes a precision current source (Figure 40). The op amp
buffers the reference terminal to maintain good CMR. The
output voltage, VX, of the AD620 appears across R1, which
converts it to a current. This current, less only the input bias
 40. Precision Voltage-to-Current Converter (Operates on 1.8 mA, ±3 V)GAIN SELECTIONThe AD620 gain is resistor-programmed by RG, or more
precisely, by whatever impedance appears between Pins 1 and 8.The AD620 is designed to offer accurate gains using 0.1% to 1%resistors. Table 5 shows required values of RG for various gains.Note that for G = 1, the RG pins are unconnected (RG = ∞). Forany arbitrary gain, RG can be calculated by using the  nimize gain error, avoid high parasitic resistance in series
with RG; to minimize gain drift, RG should have a low TC—lessthan 10 ppm/°C—for the best performance.Table 5. Required Values of Gain Resistors1% Std TableValue of RG(Ω)CalculatedGain0.1% Std TableValue of RG(Ω )CalculatedGain49.9 k 1.990 49.3 k 2.002
12.4 k 4.984 12.4 k 4.9845.49 k 9.998 5.49 k 9.9982.61 k 19.93 2.61 k 19.931.00 k 50.40 1.01 k 49.9199 100.0 499 100.0249 199.4 249 199.4100 495.0 98.8 501.049.9 991.0 49.3 1,003.0NPUT AND OUTPUT OFFSET VOLTAGE
The low errors of the AD620 are attributed to two sources,
input and output errors. The output error is divided by G whenreferred to the input. In practice, the input errors dominate at
high gains, and the output errors dominate at low gains. The
total VOS for a given gain is calculated as
Total Error RTI = input error + (output error/G)
Total Error RTO = (input error × G) + output error
REFERENCE TERMINAL
The reference terminal potential defines the zero output voltageand is especially useful when the load does not share a preciseground with the rest of the system. It provides a direct means ofinjecting a precise offset to the output, with an allowable rangeof 2 V within the supply voltages. Parasitic resistance should bekept to a minimum for optimum CMR.
INPUT PROTECTIONThe AD620 safely withstands an input current of ±60 mA for
several hours at room temperature. This is true for all gains andpower on and off, which is useful if the signal source andamplifier are powered separately. For longer time periods, theinput current should not exceed 6 mA.
For input voltages beyond the supplies, a protection resistor
should be placed in series with each input to limit the current tomA. These can be the same resistors as those used in the RFIfilter. High values of resistance can impact the noise and ACCMRR performance of the system. Low leakage diodes (such asthe BAV199) can be pla

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