TC1798 Datasheet, PDF (136/200 Pages) Infineon Technologies AG – 32-Bit Single-Chip Microcontroller

TC1798
Electrical ParametersDC Parameters
3) This represents an equivalent switched capacitance. This capacitance is not switched to the reference voltage
at once. Instead smaller capacitances are successively switched to the reference voltage.
4) The sum of DNL/INL/GAIN/OFF errors does not exceed the related TUE total unadjusted error.
5) If a reduced analog reference voltage between 1V and V_DDM / 2 is used, then there are additional decrease in
the ADC speed and accuracy.
6) If the analog reference voltage range is below V_DDM but still in the defined range of V_DDM / 2 and V_DDM is used,
then the ADC converter errors increase. If the reference voltage is reduced by the factor k (k<1),
TUE,DNL,INL,Gain, and Offset errors increase also by the factor 1/k.
7) If the analog reference voltage is > V_DDM, then the ADC converter errors increase.
8) For 10-bit conversions the error value must be multiplied with a factor 0.25.
9) For 8-bit conversions the error value must be multiplied with a factor 0.0625.
10) For f_ADCI between 18MHz and 20MHz the TUE and Gain Error can increase beyond the given limits. For
STC < 2 INL, DNL , and Offset errors can also increase.
11) For a conversion time of 1 µs a rms value of 85µA result for I_AREFx.
12) The leakage current definition is a continuos function, as shown in figure ADCx Analoge Input Leakage. The
numerical values defined determine the characteristic points of the given continuous linear approximation -
they do not define step function.
13) Measured without noise.
14) For 10-bit conversion the TUE is ±2LSB; for 8-bit conversion the TUE is ±1LSB
15) A running conversion may become inexact in case of violating the normal conditions (voltage overshoot).
16) If the reference voltage V_AREFx increase or the V_DDM decrease, so that V_AREF = (V_DDM + 0.05V to V_DDM + 0.07V),
then the accuracy of the ADC decrease by 4LSB12.
Table 24 Conversion Time (Operating Conditions apply)
Parameter
Symbol Values
Unit Note
Conversion
t_C
time with
post-calibration
Conversion
time without
post-calibration
CC 2 × T_ADC + (4 + STC + n) × T_ADCI μs
2 × T_ADC + (2 + STC + n) × T_ADCI
n = 8, 10, 12 for
n - bit conversion
T_ADC = 1 / f_FPI
T_ADCI = 1 / f_ADCI
The power-up calibration of the ADC requires a maximum number of 4352 f_ADCI cycles.
Data Sheet
129
V 1.1, 2014-05