ST92141 - ELECTRICAL CHARACTERISTICS
A/D ANALOG SPECIFICATIONS
(VDD = 5V, TA = 25°C, fINTCLK = 25MHz, unless otherwise specified)
Parameter
Typical
Minimum
Maximum
Conversion time
138
Sample time
85
Power-up time
60
Resolution
8
8
Monotonicity
No missing codes
GUARANTEED
GUARANTEED
Zero input reading
00
Full scale reading
FF
Offset error
1
Gain error
1
Diff. Non Linearity error (DNL)
1
Int. Non Linearity error (INL)
1
Absolute Accuracy
2
Input Resistance
2.7
Hold Capacitance
Input Leakage
1.4
±1
Units (1)
INTCLK
INTCLK
µs
bits
Notes
(2)(6)
(6)
(6)
Hex
Hex
LSBs
LSBs
LSBs
LSBs
LSBs
kΩ
pF
µA
(6)
(6)
(1)(4)(6)
(4)(6)
(4)(6)
(4)(6)
(4)(6)
(3)(5)(6)
(5)(6)
(6)
Note:
(1) “1LSBideal” has a value of AVDD/256
(2) Including sample time
(3) This is the internal series resistance before the sampling capacitor
(4) This is a typical expected value, but not a tested production parameter.
If V(i) is the value of the i-th transition level (0 ≤ i ≤ 254), the performance of the A/D converter has been evaluated as follows:
OFFSET ERROR= deviation between the actual V(0) and the ideal V(0) (=1/2 LSB)
GAIN ERROR= deviation between the actual V(254) and the ideal V(254) - V(0) (ideal V(254)=AV DD-3/2 LSB)
DNL ERROR= max {[V(i) - V(i-1)]/LSB - 1}
INL ERROR= max {[V(i) - V(0)]/LSB - i}
ABS. ACCURACY= overall max conversion error
(5) Simulated value.
(6) The specified values are guaranteed only if an overload condition occurs on a maximum of 2 non-selected analog input pins and the
absolute sum of input overload currents on all analog input pins does not exceed ±10 mA.
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