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ADCHS LPC4370 Problems creation interface.

Question asked by Fabio De Bernardi on Feb 17, 2017
Latest reply on Feb 21, 2017 by Hui_Ma

good morning,
We are undertaking a project with the micro lpc4370 and we find it difficult to properly size the interface circuit for the analog readings by adchs.

We use the internal vref to 0.5V, in the datasheet is reported that the range of values are compared -+400mV to  vref. But in the datasheet lpc3470 page. 131

Symbol Parameter Conditions Min Typ Max Unit

VDC DC input common mode level          0.1          0.5          0.9 V
                                                               -2048            0          +2047 digit

We (range) input voltage peak-to-peak   0.72         0.8          0.88 V

The minimum value in this case may range from 0.1 to 0.14V?

The maximum value in this case can range from 0.86 to 0.94V?

We can not correctly interpret these data.

Can you help?

Thanks and good job