ATXMEGA256A3_10 Datasheet, PDF (100/110 Pages) ATMEL Corporation – 8/16-bit AVR XMEGA A3 Microcontroller

36.2.2 rev. A
XMEGA A3
8. DAC has increased INL or noise for some operating conditions
Some DAC configurations or operating condition will result in increased output error.
– INL error is increased up to 35 LSB when VCC < 2.0V
– Enabling Sample and Hold, will increase noise and reduce resolution below 8 bit
Problem fix/Workaround
None, avoid using the DAC in the above configurations in order to prevent increased INL
error.
9. VCC voltage scaler for AC is non-linear
The 6-bit VCC voltage scaler in the Analog Comparators is non-linear.
Problem fix/Workaround
Use external voltage input for the analog comparator if accurate voltage levels are needed.
10. Maximum operating frequency below 1.76V is 8 MHz
To ensure correct operation, the maximum operating frequency below 1.76V VCC is 8 MHz.
Problem fix/Workaround
None, avoid running the device outside this frequency and voltage limitation.
11. Inverted I/O enable does not affect Analog Comparator Output
The inverted I/O pin function does not affect the Analog Comparator output function.
Problem fix/Workarund
Configure the analog comparator setup to give an inverted result (i.e. connect positive input
to the negative AC input and vice versa), or use and externel inverter to change polarity of
Analog Comparator Output.
Not sampled.
8068R–AVR–08/10
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