AT32UC3L0128 Datasheet, PDF (60/96 Pages) ATMEL Corporation – 32-bit Atmel AVR Microcontroller

AT32UC3L0128/256
Figure 7-7. ADC Input
R_SOURCE
Positive Input
R_ONCHIP
V_IN
C_SOURCE
C_ONCHIP
ADCVREFP/2
The minimum sample and hold time (in ns) can be found using this formula:
t_SAMPLEHOLD ≥ (R_ONCHIP + R_SOURCE) × (C_ONCHIP + C_SOURCE) × ln (2^{n + 1})
Where n is the number of bits in the conversion. t_SAMPLEHOLD is defined by the SHTIM field in the
ADCIFB ACR register. Please refer to the ADCIFB chapter for more information.
7.8.6.2
Applicable Conditions and Derating Data
Table 7-30. Transfer Characteristics 12-bit Resolution Mode⁽¹⁾
Parameter
Conditions
Min
Typ
Max
Units
Resolution
12
Bit
Integral non-linearity
Differential non-linearity
ADC clock frequency = 6MHz,
+/-4
Input Voltage Range = 0 - V_ADVREFP
ADC clock frequency = 6MHz,
Input Voltage Range = (10% V_ADVREFP) -
+/-2
(90% V_ADVREFP)
LSB
-1.5
1.5
Offset error
ADC clock frequency = 6MHz
+/-3
Gain error
+/-5
Note: 1. These values are based on simulation and characterization of other AVR microcontrollers manufactured in the same pro-
cess technology. These values are not covered by test limits in production.
Table 7-31. Transfer Characteristics, 10-bit Resolution Mode⁽¹⁾
Parameter
Conditions
Resolution
Integral non-linearity
Differential non-linearity
Offset error
ADC clock frequency = 6MHz
Gain error
Min
Typ
Max
Units
10
Bit
+/-1
-1
1
LSB
+/-1
+/-2
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32145BS–01/2012