【经验】圣邦微差分电压单路比较器SGM8771的应用经验

时间： 2022-09-10 来源：世强

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SGM8771是一款高电压、高精度的差分电压单路比较器，可在单电源或双电源电压条件下工作，单电源：2.8V至36V，双电源：±1.4V至±18V。SGM8771的输出为开漏输出模式，还具有如下特性：

■低电源电流：180μA（典型值）

■内部参考电压：1.225V

■超低输入偏置电压：2.4mV（最大值）

■超低输入偏置电流：±20pA（典型值）

■宽工作温度范围-40~+125℃

■提供绿色SOIC-8和TDFN-3×3-8L封装

SGM8771的低输入偏置电压电流、宽工作温度范围特性，适用于精密工业设备应用。

如下为SGM8771的应用经验：

SGM8771自带Vref引脚，使用时可省去外部的参考电压供电，只需要将Vref脚短接到差分输入引脚其中的一个，如Vin-即可，如下图所示：

SGM8771的输出为开漏输出模式，需接上拉电阻。需要注意的是，内部参考电压Vref为1.225V，差分输入端Vin+的电压，可通过电阻分压来调整对应的比较点。另外，SGM8771内部没有迟滞功能，如需要在比较点附近有防止抖动的作用，可以用电阻在外部搭建迟滞电路即可。

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SGMICRO比较器选型表

微功耗比较器，低功耗300nA，单/双通道，具有闩锁功能；高速比较器，传播延迟低至6ns，高速宽电压，推挽/开漏输出

Propagation Delay(L to H)(ns、μs)

Propagation Delay(H to L)(ns)

选型表 - SGMICRO 立即选型

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