Motorola MC9S12C-Family warranty Current injection, Table B-5 ATD Electrical Characteristics

Device User Guide — 9S12C128DGV1/D V01.05

B.4.3.3 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 conditions.

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 B-5 ATD Electrical Characteristics

Conditions are shown in Table A-4 unless otherwise noted

Num	C	Rating	Symbol	Min	Typ	Max	Unit
1	C	Max input Source Resistance	RS	-	-	1	KΩ
		Total Input Capacitance	CINN
2	T	Non Sampling				10	pF
		Sampling	CINS			15
3	C	Disruptive Analog Input Current	INA	-2.5		2.5	mA
4	C	Coupling Ratio positive current injection	Kp			10-4	A/A
5	C	Coupling Ratio negative current injection	Kn			10-2	A/A

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