TC1791 Datasheet, PDF (109/153 Pages) Infineon Technologies AG – 32-Bit Single-Chip Microcontroller

TC1791
Electrical ParametersDC Parameters
11) For a conversion time of 1 µs a rms value of 85µA result for I_AREF0.
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_AREF 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 28 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.
R_EXT
ANx
Analog Input Circuitry
R_{AIN, On}
V_AIN =
C_EXT
V_AGNDx
R_AIN7T
C_AINTOT - C_AINSW
C_AINSW
V_AREFx
V_AREF
V_AGNDx
Figure 8 ADCx Input Circuits
Data Sheet
Reference Voltage Input Circuitry
R_{AREF, On}
C_AREFTOT - C_AREFSW
C_AREFSW
Analog_InpRefDiag
102
V 1.1, 2014-05