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TXB0106 SPI通信

Other Parts Discussed in Thread: ADS1211, TXB0106, SN74AVC4T774, TXS0104E

采用TXB0106做电平转换,一端接3.3V的处理器SPI,另外一端接ADS1211的5V的SPI,进行转换,其中SPI时钟在未进入TXB0106时,时钟良好,可是测量经过TXB0106后的波形,已经不再是方波,二是锯齿波,并且频率跳动请问专家这是为何?