Datasheet

98
[Not recommended for new designs - Use XMEGA A1U series] XMEGA A1 [DATASHEET]
8067O–AVR–06/2013
Problem fix/Workaround
None, the actual ADC resolution will be reduced with up to ±2 LSB.
4. ADC gain stage output range is limited to 2.4 V
The amplified output of the ADC gain stage will never go above 2.4 V, hence the differential input will only give cor-
rect output when below 2.4 V/gain. For the available gain settings, this gives a differential input range of:
Problem fix/Workaround
Keep the amplified voltage output from the ADC gain stage below 2.4 V in order to get a correct result, or keep
ADC voltage reference below 2.4 V.
5. Sampling speed limited to 500 ksps for supply voltage below 2.0V
The sampling frequency is limited to 500 ksps for supply voltage below 2.0V. At higher sampling rate the INL error
will be several hundred LSB.
Problem fix/Workaround
None.
6. ADC Event on compare match non-functional
ADC signalling event will be given at every conversion complete even if Interrupt mode (INTMODE) is set to
BELOW or ABOVE.
Problem fix/Workaround
Enable and use interrupt on compare match when using the compare function.
7. Bandgap measurement with the ADC is non-functional when VCC is below 2.7V
The ADC can not be used to do bandgap measurements when VCC is below 2.7V.
Problem fix/Workaround
– 1x gain: 2.4 V
– 2x gain: 1.2 V
– 4x gain: 0.6 V
– 8x gain: 300 mV
– 16x gain: 150 mV
– 32x gain: 75 mV
– 64x gain: 38 mV