S12ECT16B8CV2 datasheet(123/152 Pages) NXP

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MC9S12XDP512 Device User Guide — V01.12

A current is injected into the channel being converted. The channel being stressed has conversion

values of $3FF ($FF in 8-bit mode) for analog inputs greater than VRH and $000 for values less than

VRL unless the current is higher than specified as disruptive condition.

2. Current is injected into pins in the neighborhood of the channel being converted. A portion of this

current is picked up by the channel (coupling ratio K), This additional current impacts the accuracy

of the conversion depending on the source resistance.

The additional input voltage error on the converted channel can be calculated as VERR =K*RS *

IINJ, with IINJ being the sum of the currents injected into the two pins adjacent to the converted

channel.

A.2.3 ATD accuracy

A.2.3.1 5V Range

Table A-13 specifies the ATD conversion performance excluding any errors due to current injection,

input capacitance and source resistance.

Table A-12 ATD Electrical Characteristics

Conditions are shown in Table A-4 unless otherwise noted

Num C

Rating

Symbol

Min

Typ

Max

Unit

C Max input Source Resistance

Ω

Total Input Capacitance

Non Sampling

Sampling

CINN

CINS

C Disruptive Analog Input Current

INA

-2.5

2.5

C Coupling Ratio positive current injection

TBD

A/A

C Coupling Ratio negative current injection

TBD

A/A

Table A-13 ATD Conversion Performance 5V

Conditions are shown in Table A-4 unless 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

P 10-Bit Resolution

LSB

P 10-Bit Differential Nonlinearity

DNL

–1

Counts

P 10-Bit Integral Nonlinearity

INL

–2.5

±1.5

2.5

Counts

4P 10-Bit Absolute Error1

-3

±2.0

Counts

P 8-Bit Resolution

LSB

P 8-Bit Differential Nonlinearity

DNL

–0.5

0.5

Counts

P 8-Bit Integral Nonlinearity

INL

–1.0

±0.5

1.0

Counts

8P 8-Bit Absolute Error1

-1.5

±1.0

1.5

Counts

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

S12ECT16B8CV2 Datasheet(PDF) 123 Page - NXP Semiconductors

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