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信号采集

Other Parts Discussed in Thread: ADS1675, THS4531, OPA2365

不知道为什么好的采集卡都那么贵,我需要采集交流信号频率500kHz---2MHz,电压几微伏至几十微伏,请教下前置放大该放大多少倍比较合适呢?还有不知道为什么采集卡一般都是16位的,24位的很少,要不就是采样率低,我看了ads1675,是24位的,采样率也有4M,适合吗?请推荐下方案啊,本人技术菜鸟