What voltage is within specifications on the analog input pins i.e. what is the absolute voltage that can be applied to any analog input pin.
The analog input pins can tolerate a voltage from GND – 50 mV to AVDD + 50 mV when the buffer is disabled.
When the buffer is enabled, the buffer itself will require some headroom. The absolute voltage on the analog input pins must be between GND + 250mV and AVDD – 250mV. The buffer will be non-linear outside this range so the device will be unable to meet the datasheet specifications.
When the in-amp is enabled (gains greater than 1), the in-amp itself requires some headroom. The absolute voltage on the analog input pins is the same as listed above. However, the maximum analog input signal that can be processed by the in-amp is ±(AVDD – 1.25V)/Gain. The analog input is naturally within this range if a 2.5 V reference is used. This specification is important if a reference equal to AVDD is used. If the analog input is outside this range, the ADC will function but the part will not meet the datasheet specifications as the in-amp is non-linear near the power supply rails.
Retrieving data ...