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ADS1299-4: 内部测试信号值不是以0为中心

Part Number: ADS1299-4
Other Parts Discussed in Thread: ADS1299

测试所得内部测试信号范围在 -2.41mv ~ 1.34 mv之间,不是以0为中心的 -1.875mv ~ 1.875mv,会有什么原因导致的怎么去调校,图为寄存器配置情况