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ADS1278的DVDD问题!

Other Parts Discussed in Thread: ADS1278, ADS1274

按照ads1278的数据手册做了两块电路板。其中一个给ADS1274用(板1),另外一块是ADS1278(板2),两者所要实现的功能不同,电路也有稍许差异。

两块电路板中DVDD(数字内核)均采用的是LT1761ES-1.8提供的1.8V电源

现在的问题是板1上焊的是ADS1274,DVDD为1.8V,正常;而板2上焊的是ADS1278,DVDD为2.48V

   我将ADS1278焊到了板1上,结果板1上的DVDD也变成了2.48V,请问这是ADS1278的问题吗?数据手册上说的是1274和1278的数字内核都是1.8V的。