哪儿有16bit 20MHz采样率的ADC IP？

高精度高速ADC属于美帝对华出口管制条目，国内大概没哪家能给你。

中国被当成仅次于朝鲜伊朗一类的邪恶国家，以下的ADC受美帝商务部出口管制
Analogue-to-digital and digital-to-analogue converter integrated circuits, as follows:
(a)    Analogue-to-digital converters having any of the following:
(1)    A resolution of 8 bit or more, but less than 10 bit, with an output rate greater than 500 million words per second;
(2)    A resolution of 10 bit or more, but less than 12 bit, with an output rate greater than 200 million words per second;
(3)    A resolution of 12 bit with an output rate greater than 105 million words per second;
(4)    A resolution of more than 12 bit but equal to or less than 14 bit with an output rate greater than 10 million words per second; or
(5)    A resolution of more than 14 bit with an output rate greater than 2.5 million words per second;  (L.N. 95 of 2006; L.N. 254 of 2008)