The ADS7843 is a 12-bit sampling analog-to-digital con- verter (ADC) used to drive 4-wire touch-screens to serial interfaces by ratiometrically converting two differential in- put signals. The ADS7843 also produces an accurate output with the

采样率转换程序，程序主体分为上采样与下采样-Sample rate conversion process, the program is divided into the main sampling and down-sampling