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ADS1255电源基准和供电

Other Parts Discussed in Thread: ADS1255, ADS1246, REF3325

1、传感器和ADS1255都是5V供电,ADS1255基准电压是2.5V ,因为地方只够放一个soic-8的基准源,所以想要通过一个5V输出的基准电压源芯片输出5V和2.5V,请问TI的专家是否有可靠的电路能够保证转换后2.5V基准电压的噪声符合ADS1255的要求?

2、ADS1255/6都需要7.68M晶振,但是7.68M晶振的封装太大,无法缩小尺寸,请问是否有不需要晶振的24bit ADC ,输入为单端0~5V ,封装越小越好?