atxmega128d4-mh ATMEL Corporation, atxmega128d4-mh Datasheet - Page 91

• Manufacturer Part Number: atxmega128d4-mh
• Description: 8/16-bit Xmega D4 Microcontroller
• Manufacturer: ATMEL Corporation

8135F–AVR–02/10
5. ADC gain stage output range is limited to 2.4 V
6.
7.
8. BOD will be enabled after any reset
The amplified output of the ADC gain stage will never go above 2.4 V, hence the differential
input will only give correct 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 cor-
rect result, or keep ADC voltage reference below 2.4 V.
ADC has increased INL error for some operating conditions
Some ADC configurations or operating condition will result in increased INL error.
In differential mode INL is increased to:
– 6 LSB for sample rates above 130 kSPS, and up to 8 LSB for 200 kSPS sample rate.
– 6 LSB for reference voltage below 1.1V when VCC is above 3.0V.
– 20 LSB for ambient temperature below 0 degree C and reference voltage below 1.3V.
In single ended mode, the INL is increased up to a factor of 3 for the conditions above.
Problem fix/Workaround
None, avoid using the ADC in the above configurations in order to prevent increased INL
error.
ADC propagation delay is not correct when 8x-64x gain is used
The propagation delay will increase by only one ADC clock cycle for the 8x and 16x gain set-
ting, and 32x and 64x gain settings.
Problem fix/Workaround
None.
If any reset source goes active, the BOD will be enabled and keep the device in reset if the
VCC voltage is below the programmed BOD level. During Power-On Reset, reset will not be
released until VCC is above the programmed BOD level even if the BOD is disabled.
Problem fix/Workaround
Do not set the BOD level higher than VCC even if the BOD is not used.
–
–
–
–
–
–
–
16x
32x
64x
1x
2x
4x
8x
gain:
gain:
gain:
gain:
gain:
gain:
gain:
300
150
2.4
1.2
0.6
75
38
V
V
V
mV
mV
mV
mV
XMEGA D4
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