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ADS1263: 该芯片输出恒流源的电流范围

Part Number: ADS1263

该芯片输出的恒流源电流范围为:50 μA, 100 μA, 250 μA, 500 μA, 750 μA, 1000 μA, 1500 μA, 2000μA, 2500 μA, and 3000 μA,这是固定的几种选择?恒流源的精度怎么样?对于测试1Ω电阻,采用四线制测试,测试精度大概为多少?