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DAC7731: DAC7731的数字部分的工艺类型

Part Number: DAC7731

请问DAC7731的数字部分是bipolar工艺还是cmos工艺?

管脚悬空时是高阻状态还是什么电平状态?

手册中对于不使用的管脚是悬空不做处理,是否意味着管脚有确定状态,无需管理?