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DAC3161应用IO TEST问题

Other Parts Discussed in Thread: DAC3161, DAC3174

DAC3161在应用中若要使用IO TEST该怎么用?我现在能输出正常波形,但温度变化过大后,可能会有FPGA和DAC数据接口时序不匹配问题。调整寄存器延时后又能恢复正常。所以想用DAC芯片内部的IO TEST功能实现接口时序先验证再工作。但无论怎么配置都无法正常使用该功能。