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DAC7311: 双极性输出问题

Part Number: DAC7311

请教两个问题:

1、DAC7311手册9.2.3节双极性输出操作中给了一个例子,最终输出可以有±5V。我的问题是放大器不需要±电压吗?

2、sync引脚就是片选CS脚吧,因为一个spi要拖多个DAC,sync是不是就是片选脚