TC1767 Datasheet, PDF (95/126 Pages) Infineon Technologies AG – 32-Bit Single-Chip Microcontroller

TC1767
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 10^oC.
14) Applies to AINx, when used as auxiliary reference inputs.
15) 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 = 25µs can be calculated with the formula I_{AREF_MAX} = Q_CONV/t_C. Every conversion
needs a total charge of Q_CONV = 150pC from V_AREF.
All ADC conversions with a duration longer than t_C = 25µs consume an I_{AREF_MAX} = 6µA.
16) For the definition of the parameters see also Figure 18.
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 can deviate from V_AREF/2, and is typically
1.35V.
19) R_AIN7T = 1400 Ohm maximum and 830 Ohm typical in the V_DDM = 3.3V± 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 17 ADC0/ADC1 Clock Circuit
ADC_clocking
Data Sheet
91
V1.3, 2009-09