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我今天看1310的手册，看到ADC Characteristics时，看到手册上写着
请问，上面红线部分的第三个TEST CONDITIONS是什么意思？如果我们要采用这种方式采集ADC，我们需要怎么做？是修改硬件，还是修改软件。或者两者都修改？
Felix ZF：
使用1.44v reference时，需要disable voltage scaling
详见TRM的17.4.8.2 ADC Reference章节。
The ADC supports two different internal references, one constant and one relative to VDDS.The ADC automatically scales down the input signal to be within the reference range. It is possible todisable the scaling, but this requires great care by the user to ensure the maximum ratings in the datasheet are followed. With scaling enabled, the internal fixed reference looks like 4.3 V compared to theactual input level. With scaling disabled, the reference is 1.44 V.NOTE: With scaling disabled it is possible to cause permanent damage to the ADC with voltagelevels lower than VDDS. See the data sheet for detailed limits.To save power in synchronous mode, the ADC reference can also be powered off during idle periods (ifthe sampling period is long enough to turn it on again during sampling) by setting theADI_4_AUX:ADCREF0.REF_ON_IDLE register.The ADC reference source is selected in the ADI_4_AUX:ADCREF0.SRC register and enabled in theADI_4_AUX:ADCREF0.EN register.
Butterfly：
采集信号输入给ADC的电压在1.44V以下的话，改软件，用内部1.44V基准
