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 V0n

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

1LSB

i = 1

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Motorola MC9S12DG128B, MC9S12DT128B, MC9S12DB128B, MC9S12DJ128B manual ATD accuracy, Table A-10 ATD Conversion Performance