CC2540的ADC本身是不是有问题?
我也看到内阻相当于190K, 输入源内阻很小,我是用200欧姆分压的6位精度的恒压源. 用芯片内部参考电压做参考源, 直接测直流电压, 结果数值蓝牙发出. 去掉开头一组.
P00 P01, P02设为运放用, 运放接为射随, 输出输入和ADC完全不连接, 也不检测相关引脚ADC 通道
1) 不开运放, 相当稳定, (不是准确, 是稳定), 大概300uV在跳.
2) 打开运放, 就40mV范围跳, (强调, 运放不接入ADC)
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