ADuM2210/ADuM2211
For example, at a magnetic field frequency of 1 MHz, the
maximum allowable magnetic field of 0.2 kgauss induces a
voltage of 0.25 V at the receiving coil. This is about 50% of the
sensing threshold and does not cause a faulty output transition.
Similarly, if such an event were to occur during a transmitted
pulse (and was of the worst-case polarity), it would reduce the
Data Sheet
POWER CONSUMPTION
The supply current at a given channel of the ADuM221x
isolator is a function of the supply voltage, the channel’s data
rate, and the channel’s output load.
For each input channel, the supply current is given by
received pulse from >1.0 V to 0.75 V—still well above the 0.5 V
sensing threshold of the decoder.
The preceding magnetic flux density values correspond to
specific current magnitudes at given distances away from the
ADuM221x transformers. Figure 15 expresses these allowable
I DDI = I DDI (Q)
I DDI = I DDI (D) × (2 f ? f r ) + I DDI (Q)
For each output channel, the supply current is given by
I DDO = I DDO (Q)
f ≤ 0.5 f r
f > 0.5 f r
f ≤ 0.5 f r
I DDO = ( I DDO (D) + (0.5 × 10 ) × C L × V DDO ) × (2 f ? f r ) + I DDO (Q)
current magnitudes as a function of frequency for selected
distances. As can be seen, the ADuM221x is immune and can
be affected only by extremely large currents operated at high
frequency and very close to the component. For the 1 MHz
example noted previously, one would have to place a 0.5 kA
current 5 mm away from the ADuM221x to affect operation
of the component.
1000
DISTANCE = 1m
100
10
?3
f > 0.5 f r
where:
I DDI (D) , I DDO (D) are the input and output dynamic supply currents
per channel (mA/Mbps).
C L is the output load capacitance (pF).
V DDO is the output supply voltage (V).
f is the input logic signal frequency (MHz, half of the input data
rate, NRZ signaling).
f r is the input stage refresh rate (Mbps).
I DDI (Q) , I DDO (Q) are the specified input and output quiescent
supply currents (mA).
1
0.1
DISTANCE = 100mm
DISTANCE = 5mm
To calculate the total I DD1 and I DD2 , the supply currents for
each input and output channel corresponding to I DD1 and I DD2
are calculated and totaled. Figure 6 and Figure 7 provide per-
channel supply currents as a function of data rate for an
unloaded output condition. Figure 8 provides per-channel
supply current as a function of data rate for a 15 pF output
0.01
1k
10k 100k 1M 10M
MAGNETIC FIELD FREQUENCY (Hz)
Figure 15. Maximum Allowable Current
for Various Current-to-ADuM221x Spacings
100M
condition. Figure 9 through Figure 11 provide total I DD1 and I DD2
as a function of data rate for ADuM2210/ADuM2211 channel
configurations.
Note that at combinations of strong magnetic field and high
frequency, any loops formed by printed circuit board traces can
induce sufficiently large error voltages to trigger the thresholds
of succeeding circuitry. Care should be taken in the layout of
such traces to avoid this possibility.
Rev. D | Page 14 of 20
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