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TMS320F28069 ADC采样码字偏大

Other Parts Discussed in Thread: TMS320F28069

TMS320F28069 ADC采样时候,每路码字偏差比较大,有5个左右。前端是差分运放输出到adc口。TI这边能否给点建议(硬件和软件方面),做个改进?