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DAC8311引起基准偏移的问题

henon mike
Prodigy 20 points
Other Parts Discussed in Thread: DAC8311

DAC8311采用ADR381 供电 电压是2.5V，SYNC SCLK 和DIN 是MCU控制，电平是3.3V的，现在MCU一旦和DAC通信，基准电压就会从2.5V变成2.6xx V，三个数字口全部置低电平之后，基准电压就恢复正常。是不是IO的3.3电平影响了基准？有什么解决办法？