PC312XDP512F0CFVR datasheet(1255/1350 Pages) FREESCALE

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Appendix A Electrical Characteristics

MC9S12XDP512 Data Sheet, Rev. 2.17

Freescale Semiconductor

1255

A.2.2.3

Current Injection

There are two cases to consider.

1. 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.

Table A-14. ATD Electrical Characteristics

Conditions are shown in Table A-4 unless otherwise noted

Num

Rating

Symbol

Min

Typ

Max

Unit

C Max input source resistance

——

Ω

T Total input capacitance

Non sampling

Sampling

CINN

CINS

—

C Disruptive analog input current1

1 See also Table A-7. item 14

INA

–2.5

—

2.5

C Coupling ratio positive current injection

——

10-4

A/A

C Coupling ratio negative current injection

——

10-2

A/A

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