不稳定的ADC值

嗨，我在PSoC3上玩ADC，我有CY8CKIT-030。我的问题是，即使我把输入GPIO（P4.6）连接到VSSA，RAWEVE也非常粗糙。它在30位和40位之间跳跃，我期望一个更稳定的值。是否有可能使噪音变小，使其在±1位上稳定？当然，外部电压参考将有帮助，我会尝试，但它不可能获得更多的稳定性与内部参考和没有过滤器？我正在使用：-分辨率：16位转换模式：2速率2000 SPS -输入模式：单缓冲器增益：1缓冲器模式：轨到轨-VREF:内部绕过P0.3-时钟：内部I代码：
空主（）{初始（）；而（永远）{AdCyStistCurror（）；AdcI ISEnTrimeAdvices（AdcWaWiTi FoRayREST）；RAWDATA＝ADCJGETRESULT32（）；SaMPTF（缓冲器，“%LD”，RAWDATA）；UARTHIPPATSHIPE（缓冲器）；UARTHIPPUCRLF（0x20）；}
所以我把我的RAWDATA显示在我的终端上。谢谢



     以下为原文
  Hi,
i'm playing around with the ADC on the PSOC3, i've got the CY8CKIT-030. My Problem is even if i connect my input GPIO (P4.6) to VSSA, the rawvalue is very rough. It jumps around between bit 30 and bit 40, i expect a more stable value. Is it possible to get the noise smaller, so that it is stable on +-1 bit?
Sure a external voltage reference will help, i will try that, but isnt it possible to get more stability with the internal reference and without a filter?

I'm using:
-resolution: 16 Bit
-conversion mode: 2
-rate 2000sps
-input mode: single
-buffer gain: 1
-buffer mode: rail to rail
-Vref: internal bypassed on P0.3
-clock: internal

my code:
    void main()
  {
Initial();

while(forever)
{
ADC_StartConvert();
ADC_IsEndConversion(ADC_WAIT_FOR_RESULT);
Rawdata = ADC_GetResult32();

sprintf(Buffer, "%ld", Rawdata);
UART_PutString (Buffer);
UART_PutCRLF(0x20);
}
}
   
so i get my rawdata displayed in my terminal.

Thanks