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DAC820输出电压纹波太大

Other Parts Discussed in Thread: DAC8820

电路是按照DAC8820手册推荐的电路,输出接一个I/V转换,代码测试后,在OPA2211的1脚确实能输出正负电压,说明电路能工作,但是1脚输出的电压纹波太大了,大概得有1V,送给DAC的代码只有FF,应该输出2V左右的电压,示波器测试显示,最低有1.45V,最高2.4的波形,是不是应该在OP的1脚再加个低通滤波器会好一些