TC1797_14 Datasheet, PDF (145/192 Pages) Infineon Technologies AG – 32-Bit Single-Chip Microcontroller

TC1797
Electrical Parameters
12) Only one of these parameters is tested, the other is verified by design characterization.
13) The leakage current decreases typically 30% for junction temperature decrease of 10oC.
14) I_{AREF_MAX} is valid for the minimum specified conversion time. The current flowing during an ADC conversion
with a duration of up to t_C = 25 µs can be calculated with the formula I_{AREF_MAX} = Q_CONV / t_C. Every conversion
needs a total charge of Q_CONV = 150 pC from V_AREF.
All ADC conversions with a duration longer than t_C = 25µs consume an I_{AREF_MAX} = 6µA.
15) For the definition of the parameters see also Figure 20.
16) Applies to AINx, when used as auxiliary reference inputs.
17) This represents an equivalent switched capacitance. This capacitance is not switched to the reference voltage
at once. Instead of this smaller capacitances are successively switched to the reference voltage.
18) The sampling capacity of the conversion C-Network is pre-charged to V_AREF / 2 before the sampling moment.
Because of the parasitic elements the voltage measured at AINx deviates from V_AREF/2, and is typically 1.35 V.
19) RAIN7T = 1400 Ohm maximum and 830 Ohm typical in the V_DDM = 3.3 V ± 5% range.
20) The DC current at the pin is limited to 3 mA for the operational lifetime.
ADC kernel
clock
generation
fADC
interrupts,
etc.
registers
divider for
fADCI
divider for
fADCD
analog clock
f ADCI
digital clock
fADCD
analog part
arbiter
Figure 19 ADC0/ADC1 Clock Circuit
ADC_clocking
Table 12 Conversion Time (Operating Conditions apply)
Parameter
Symbol Value
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_ADC
T_ADCI = 1 / f_ADCI
Data Sheet
141
V1.3, 2014-08