AD9269使用内置的测试码能输出时序正确，但模拟输入无法正确转换，将差分输入短路后，采集的数字信号一直在剧烈变化，且芯片的ORA、ORB引脚也会经常输出高电平(示波器看到方波)，更换了一块芯片后也有同样的问题。
Hi apuapu,
Thank you for your interest in AD9269.
When the built-in test mode is enabled, the analog section block is disconnected that is why it cannot be converted correctly.
Please refer to the FAQ…
Please refer to the FAQ in the link provided Does the AD9249 have built-in test modes? - Documents - High-Speed ADCs - EngineerZone (analog.com) and the application note AN-877 (Rev. B) (analog.com) for more details.
Thanks and regards,
Xavier
