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MC9S12VR-Family - Data Sheet - Freescale Semiconductor

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Supply voltage 3.13 V < V DDA < 5.5 V, -40 o C < T J < 150 o C<br />

C.3 ATD Accuracy<br />

<strong>MC9S12VR</strong> <strong>Family</strong> Reference Manual, Rev. 2.8<br />

ATD Electrical Specifications<br />

Table C-3. and Table C-4. specifies the ATD conversion performance excluding any errors due to current<br />

injection, input capacitance and source resistance.<br />

C.3.1 ATD Accuracy Definitions<br />

Table C-2. ATD Electrical Characteristics<br />

Num C Rating Symbol Min Typ Max Unit<br />

1 C Max input source resistance 1<br />

For the following definitions see also Figure C-1.<br />

Differential non-linearity (DNL) is defined as the difference between two adjacent switching steps.<br />

The integral non-linearity (INL) is defined as the sum of all DNLs:<br />

R S — — 1 KΩ<br />

2 D Total input capacitance Non sampling<br />

Total input capacitance Sampling<br />

CINN CINS —<br />

—<br />

—<br />

—<br />

10<br />

16<br />

pF<br />

3 D Input internal Resistance RINA - 5 15 kΩ<br />

4 C Disruptive analog input current INA -2.5 — 2.5 mA<br />

5 C Coupling ratio positive current injection Kp — — 1E-4 A/A<br />

6 C Coupling ratio negative current injection Kn — — 5E-3 A/A<br />

1<br />

1 Refer to C.2.2 for further information concerning source resistance<br />

DNL() i<br />

V – V<br />

i i – 1<br />

= ------------------------- – 1<br />

1LSB<br />

INL( n)<br />

=<br />

n<br />

∑ DNL() i =<br />

i = 1<br />

V – V<br />

n 0<br />

-------------------- – n<br />

1LSB<br />

<strong>Freescale</strong> <strong>Semiconductor</strong> 525

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