项目中采用ADS1259,电路图如上,DVDD3.3V,AVSS为-2.5V,AVDD为+2.5V。使用中发现一个问题,通电以后AVDD会被强制拉高到3.0V左右,而当将ads1259芯片去除,+2.5V电源是正常的,因此我判断是1259芯片影响了电压。不过,整个系统工作基本正常,可以正常实现AD转换和数据读取,但是功耗很高0.2W。
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