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ISO7640FM: 隔离芯片两边是否需要共地

Part Number: ISO7640FM

Hi

我现在用dac与MCU进行SPI通信,然后用ISO7640FM做隔离,电路图如下。我遇到一个问题是,MCU无法往DAC里面写数据。当我把ISO7640换掉,用0欧姆电阻短接(也就是不用隔离),MCU可以正常往DAC里写数据。请问这是为什么?和我的原理图设计中GND与DGND没有共地有关系吗?