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pcm1792a 的IV转换问题

Other Parts Discussed in Thread: PCM1792A, OPA1662

pcm1792a的电路和规格书的推荐电路一样,IV转换也一样,只是用的运放是OPA1662,用正负5V供电,反馈的电阻阻值为560r,按照公式算转换出来的电压应该是4.386V,还离最大幅值有一定距离啊,但是负半周的波形就失真了(1khz)。求解