ADuM2250/ADuM2251
Rev. 0 | Page 12 of 16
The preceding magnetic flux density values correspond to
specific current magnitudes at given distances away from
the ADuM2250/ADuM2251 transformers.
Figure 11 expresses
these allowable current magnitudes as a function of frequency
for selected distances. As seen, the ADuM2250/ADuM2251 is
extremely immune and can be affected only by extremely large
currents operated at high frequency and very close to the com-
ponent. For the 1 MHz example, place a 0.5 kA current 5 mm
away from the ADuM2250/ADuM2251 to affect the operation
of the component.
Note that at combinations of strong magnetic fields and high
frequencies, any loops formed by printed circuit board traces
could induce sufficiently large error voltages to trigger the
threshold of succeeding circuitry. Care should be taken in
the layout of such traces to avoid this possibility.
MAG NET I C F I E L D FRE Q UENCY (Hz )
MAXIM UM AL L O W ABL E CURRENT ( kA)
1000
100
10
1
0.1
0.01
1k 10k 100M100k 1M 10M
DISTANCE = 5mm
DISTANCE = 1m
DISTANCE = 100mm
06670-011
Figure 11. Maximum Allowable Current for Various
Current-to-ADuM2250/ADuM2251 Spacings