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ADS1299: 内部测试信号

Part Number: ADS1299


您好,我采用菊花链的方式连接多片1299,使用外部CLK,硬SPI通信。使用内部生成的测试信号,在1K采样率下,前7片1299的数据是一致的。增加数量之后,有的片是内部信号的高电平有的是低电平,想问一下该如何解决。