Motorola MC9S12DG128B, MC9S12DT128B manual A.2.3 ATD accuracy, 1LSB, INLn = ∑ DNLi = Vn -V0 -n

MC9S12DT128B Device User Guide — V01.07

A.2.3 ATD accuracy

Table A-10specifies the ATD conversion performance excluding any errors due to current injection, input capacitance and source resistance.

Table A-10 ATD Conversion Performance

Conditions are shown in Table A-4unless otherwise noted

VREF = VRH - VRL = 5.12V. Resulting to one 8 bit count = 20mV and one 10 bit count = 5mV

fATDCLK = 2.0MHz

Num	C	Rating	Symbol	Min	Typ	Max	Unit
1	P	10-Bit Resolution	LSB		5		mV
2	P	10-Bit Differential Nonlinearity	DNL	–1		1	Counts
3	P	10-Bit Integral Nonlinearity	INL	–2.5	±1.5	2.5	Counts
4	P	10-Bit Absolute Error1	AE	-3	±2.0	3	Counts
5	P	8-Bit Resolution	LSB		20		mV
6	P	8-Bit Differential Nonlinearity	DNL	–0.5		0.5	Counts
7	P	8-Bit Integral Nonlinearity	INL	–1.0	±0.5	1.0	Counts
8	P	8-Bit Absolute Error(1)	AE	-1.5	±1.0	1.5	Counts

NOTES:

1. These values include the quantization error which is inherently 1/2 count for any A/D converter.

For the following definitions see also Figure A-1.

Differential Non-Linearity (DNL) is defined as the difference between two adjacent switching steps.

( ) Vi –Vi –1 DNL i = ------------------------–1

1LSB

The Integral Non-Linearity (INL) is defined as the sum of all DNLs:

n

INL(n) = ∑ DNL(i) = Vn –V0–n

-------------------

1LSB

i = 1

95

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