【产品】高采样速率、电压下降慢的反馈型采样保持放大器LF398

时间： 2019-05-17 来源：上海国芯

技术问答

上海国芯LF398是一款单片反馈型采样/保持放大电路，也是目前较为流行的通用型采样/保持放大电路。与LF398结构相同的还有LF198、LF298等，都是由场效应管构成，具有采样速率高、保持电压下降慢和精度高等特点。

LF398由输入缓冲级、输出驱动级和控制电路三部分组成(见框图)。控制电路中A3主要起到比较器的作用:其中引脚7为参考电压，当输入控制逻辑电平高于参考端电压时，输出一个低电平信号驱动开关K闭合，此时输入信号经过A1后跟随输出到A2，再由A2输出端跟随输出。同时向保持电容（接引脚6端）充电;而当控制逻辑电平低于参考端电压时，输出一个高电平信号使开关断开。以达到非采样时间内保持器仍保持原来输入的目的。因此A1、A2是跟随器，其主要作用是对保持电容输入和输出端进行阻抗变换，以提高采样保持放大器性能。

图1 LF398反馈型采样保持放大器引脚排列

图2 LF398反馈型采样保持放大器极限参数

LF398主要性能：

±5V~±18V供电；

采样时间<10uS；

TTL 、PMOS、CMOS兼容逻辑输入；

0.5mV典型采样/保持失调电压（Ch=0.01 uF）；

低输入失调；

0.002%增益误差；

保持状态下低输出噪声；

保持状态下输入特性不变；

高电源电压抑制比；

高带宽。

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本文由花木转载自上海国芯，原文标题为:LF398 反馈型采样保持放大器数据手册，本站所有转载文章系出于传递更多信息之目的，且明确注明来源，不希望被转载的媒体或个人可与我们联系，我们将立即进行删除处理。

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