是否可以直接用FPGA输出3.3V给dac5688,它判断高低电平的门限是多少?
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5688可以配置内部的IO是3.3V电平容忍还是1.8V电平容忍的
看一下寄存器26的最高位
Used to program the digital input voltage threshold levels. ‘0’=3.3V tolerate pads and ‘1’=1.8V tolerate pads.
Applies to following digital pins: CLKO_CLK1, LOCK_CLK1C, DA[15:0], DB[15:0], SYNC, RESETB, SCLK,
SDENB, SDIO and TXENABLE