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ADS7945 接线
AVDD 5V
DVDD 3.3V
AIN0P 1.5V
AIN0N AGND
AIN1P AGND
AIN1N AGND
REF 5V 及并联一个1UF 电容
REFGND AGND
GND AGND
CHSEL DGND
PDEN DGND
NC、PAD AGND
代码用的是ADS7946的 （已验证过的）
采样率125k SPI时钟3M
读出的数据为3AB6
