使用了20MHz无源晶振负载电容是20p,会有部分无法起振,但当把两个负载电容去掉后可以起振。
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您好,
如您图片所示,外部晶振最大频率不超过16.5MHZ.
芯片数据手册“Table 5. Recommended Crystals”有推荐的选型。
ADS131A0x 双通道或四通道 24 位 128kSPS 同步采样 Δ-Σ ADC datasheet (Rev. D) (ti.com.cn)