ADuM1230

Rev. A | Page 8 of 12

APPLICATION NOTES

COMMON-MODE TRANSIENT IMMUNITY

In general, common-mode transients consist of linear and

sinusoidal components. The linear component of a common-

mode transient is given by

where ΔV/Δt is the slope of the transient shown in Figure 11

and Figure 12.

The transient of the linear component is given by

The ADuM1230’s ability to operate correctly in the presence of

linear transients is characterized by the data in Figure 8. The

data is based on design simulation and is the maximum linear

transient magnitude that the ADuM1230 can tolerate without

an operational error. This data shows a higher level of robustness

than what is shown in Table 5 because the transient immunity

values obtained in Table 5 use measured data and apply

allowances for measurement error and margin.

TEMPERATURE (°C)

100

–40

0

40

80

–20

20

60

300

250

200

150

100

50

0

WORST-CASE PROCESS VARIATION

BEST-CASE PROCESS VARIATION

Figure 8. Transient Immunity (Linear Transients) vs. Temperature

The sinusoidal component (at a given frequency) is given by

where:

f is the frequency of the sinusoidal.

The transient magnitude of the sinusoidal component is given by

The ADuM1230’s ability to operate correctly in the presence

of sinusoidal transients is characterized by the data in Figure 9

and Figure 10. The data is based on design simulation and is

ADuM1230 can tolerate without an operational error. Values

for immunity against sinusoidal transients are not included in

Table 5 because measurements to obtain such values have not

been possible.

FREQUENCY (MHz)

2000

0

500

1000

1500

1750

250

750

1250

200

160

180

120

80

40

140

100

60

20

0

WORST-CASE PROCESS VARIATION

BEST-CASE PROCESS VARIATION

Figure 9. Transient Immunity (Sinusoidal Transients),

27°C Ambient Temperature

FREQUENCY (MHz)

2000

0

500

1000

1500

1750

250

750

1250

200

140

100

60

20

160

180

120

80

40

0

WORST-CASE PROCESS VARIATION

BEST-CASE PROCESS VARIATION

Figure 10. Transient Immunity (Sinusoidal Transients),

100°C Ambient Temperature