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Digital potentiometer including output buffer

机译:数字电位器,包括输出缓冲器

摘要

A digital potentiometer is disclosed that includes first, second, and third signal terminals. A chain of series-connected impedance elements with multiple tap points is connected between the first and second signal terminals. A plurality of first switching devices are each connected to a respective one of the multiple tap points and to an internal wiper node. A configurable output stage is connected between the internal wiper node and the third signal terminal. The configurable output stage includes a buffer and a second switching device. The second switching device is operable to bypass the buffer. A switching circuit controls switching of the first switching devices. The switching circuit includes a Gray-code counter, a Gray-code decoder, and a make-before-break circuit that controls the timing of the switching of the wiper switches.
机译:公开了一种数字电位计,其包括第一,第二和第三信号端子。在第一信号端子和第二信号端子之间连接具有多个抽头点的串联的阻抗元件链。多个第一开关装置分别连接到多个分接点中的一个和内部抽头节点。可配置的输出级连接在内部抽头节点和第三信号端子之间。可配置的输出级包括缓冲器和第二开关装置。第二开关装置可操作以绕过缓冲器。开关电路控制第一开关装置的开关。切换电路包括格雷码计数器,格雷码解码器和控制抽头开关的切换定时的先通后断电路。

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