ADuM7234

Rev. A | Page 8 of 12

APPLICATIONS INFORMATION

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

Figure 8 characterizes the ability of the ADuM7234 to operate

correctly in the presence of linear transients. The data, based on

design simulation, is the maximum linear transient magnitude

that the ADuM7234 can tolerate without an operational error.

This data shows a correlation with the data that is listed in

Table 4, which is based on measured data.

TEMPERATURE (°C)

100

–40

0

40

80

–20

20

60

50

45

35

40

30

25

20

15

10

5

0

BEST-CASE PROCESS VARIATION

WORST-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

Figure 9 and Figure 10 characterize the ability of the ADuM7234

to operate correctly in the presence of sinusoidal transients.

The data is based on design simulation and is the maximum

can tolerate without an operational error. Values for immunity

against sinusoidal transients are not included in Table 4 because

measurements to obtain such values have not been possible.

FREQUENCY (MHz)

2000

0

500

1000

1500

1750

250

750

1250

250

200

150

100

50

0

BEST-CASE PROCESS VARIATION

WORST-CASE PROCESS VARIATION

Figure 9. Transient Immunity (Sinusoidal Transients),

27°C Ambient Temperature

FREQUENCY (MHz)

2000

0

500

1000

1500

1750

250

750

1250

250

100

150

200

50

0

BEST-CASE PROCESS VARIATION

WORST-CASE PROCESS VARIATION

Figure 10. Transient Immunity (Sinusoidal Transients),

100°C Ambient Temperature