SAL-XC886CLM Datasheet, PDF (117/134 Pages) Infineon Technologies AG – 8-Bit Single Chip Microcontroller

SAL-XC886CLM
Electrical Parameters
Table 40
ADC Characteristics (Operating Conditions apply; V_DDP = 5V Range)
(cont’d)
Parameter
Symbol
Limit Values
min. typ . max.
Overload current K_OVD CC –
–
5.0 x
coupling factor for
10^-3
digital I/O pins
–
–
1.0 x
10^-2
Switched
capacitance at the
reference voltage
input
C_AREFSW CC –
10 20
Switched
C_AINSW CC –
5
7
capacitance at the
analog voltage
inputs
Input resistance of R_AREF CC –
1
2
the reference input
Input resistance of R_AIN
CC –
1
1.5
the selected analog
channel
Unit Test Conditions/
Remarks
–
I_OV > 0¹⁾³⁾
–
I_OV < 0¹⁾³⁾
pF ¹⁾⁴⁾
pF ¹⁾⁵⁾
kΩ ¹⁾
kΩ ¹⁾
1) Not subjected to production test, verified by design/characterization
2) TUE is tested at V_AREF = 5.0 V, V_AGND = 0 V, V_DDP = 5.0 V.
3) An overload current (I_OV) through a pin injects a certain error current (I_INJ) into the adjacent pins. This error
current adds to the respective pin’s leakage current (I_OZ). The amount of error current depends on the overload
current and is defined by the overload coupling factor K_OV. The polarity of the injected error current is inverse
compared to the polarity of the overload current that produces it. The total current through a pin is |I_TOT| = |I_OZ1|
+ (|I_OV| × K_OV). The additional error current may distort the input voltage on analog inputs.
4) 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.
5) The sampling capacity of the conversion C-Network is pre-charged to V_AREF/2 before connecting the input to
the C-Network. Because of the parasitic elements, the voltage measured at ANx is lower than V_AREF/2.
Data Sheet
110
V1.0, 2010-05