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如何提升MSP-EXP430F5438_User_Expertience的FFT_data[256]的数据大小值

大家好:

     我们购买了M430F5438A几套开发板,希望进行FFT的开发!

     采用的正弦信号(频率:1545HZ; 相位:0; 幅值:100mv),信号输入端口MIC(M1)。

     现发现FFT_data[]最大值=1085!

     当我们修改了采样精度,数据仍然没有改变!

     修改如下:

     “  

          #if 0
          ADC12CTL0 = ADC12ON + ADC12SHT02; // Configure ADC12 to sample a sequence of channels, once
          ADC12CTL1 = ADC12SHP + ADC12CONSEQ_2 + ADC12SSEL_2 + ADC12SHS_3;
          ADC12CTL2 = ADC12RES_0; // Select 8-bit resolution
         #else
          ADC12CTL0 = ADC12ON + ADC12SHT02; // Configure ADC12 to sample a sequence of channels, once
          ADC12CTL1 = ADC12SHP + ADC12CONSEQ_2 + ADC12SSEL_2 + ADC12SHS_3;
          ADC12CTL2 = ADC12RES_2; // Select 12-bit resolution
         #endif

      ”

       请问:如何将FFT_data[]的最大值提升到4000以上?