【应用】国产圣邦微高隔离低失真度模拟多路复用器SGM48755助力工业数据采集仪,失真仅0.35%
在工业领域中,通常需要对较多的工业环境数据进行采集判断以及转换分析显示,但是随着采集不同类型的数据增加,通常需要加入一个复用器芯片进行处理,通过复用器的模拟开关功能对输入信号通道的切换,进行功能的选择,最终将所需的信号传输到运放进行放大以及ADC进行信号转换,再给到MCU进行处理。某客户在设计船舶工业数据采集仪中需要对采样到的不同类型信号进行选择处理,需要用到4:1多路复用器、支持轨到轨模拟输出操作、低失真度,最终确定圣邦微高隔离低失真度模拟多路复用器SGM48755。
下图1为圣邦微高隔离低失真度4:1模拟多路复用器SGM48755的应用框图:
图1:4:1模拟多路复用器SGM48755应用框图
客户采用了圣邦微4:1模拟多路复用器SGM48755芯片,具有以下优势:
(1)高隔离度。该芯片当输入信号的频率为1MHz时,其隔离度高达-80dB(RL=50Ω),有效确保了信号的完整性;
(2)低失真度。该款模拟开关芯片当输入信号频率在20Hz~20kHz时,信号的失真度仅为0.35%(RL=600Ω);
(3)高可靠性。该芯片通过优化ADDA和ADDB控制信号的上升时间和下降时间以减小时钟馈通效应,提高信号转换的可靠性;
(4)宽动态范围。该模拟开关芯片支持轨到轨模拟输入和输出操作,提高了信号的动态范围,并且电压范围为2.5~5.5V,可选择性更宽。
综上所述,在该客户的方案设计中,考虑到客户需要4:1多路复用器、支持轨到轨模拟输出操作、低失真度的要求,并结合到该芯片已经在市场上也经过了长期的验证,性能、功能等方面都较为出色,选用圣邦微的4:1模拟多路复用器SGM48755是一个和理想的设计与选择。
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