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ADS1292R 功耗(AVDD功耗异常约4.3mA)

Other Parts Discussed in Thread: ADS1292R

我设计是两通道ECGv采样,采样率为500SPS,使用内部时钟,AVDD和DVDD都是3.3V,Gain设置为1,VREF为2.42V。

因设备要求低功耗,所以有测量AVDD和DVDD两个电源轨的电流。

三个差分输入:IN1P/IN1N和IN2P/IN2N 用于两个ECG输入,IN3P/IN3N not used,connected to AVDD,其他如GPIO有按规格书要求接DGND or AVDD。

发现在RLD和Lead OFF关掉情况下,DVDD电流和规格书中的75uA差异不大;而AVDD电源轨的电流约在4.3mA和规格书中定义的205uA差异非常大。

请教是我对ADS1292R AVDD电源轨的功耗理解错误还是配置中还未完全配置OK,ADS1292R的AVDD功耗应该是多少?