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ADuM4400/ADuM4401/ADuM4402
The pulses at the transformer output have an amplitude greater
than 1.0 V. The decoder has a sensing threshold at about 0.5 V,
thereby establishing a 0.5 V margin in which induced voltages
can be tolerated. The voltage induced across the receiving coil is
given by
V = (? dβ / dt )Σ∏ r n 2 ; n = 1, 2,…, N
1000
100
10
DISTANCE = 100mm
Data Sheet
DISTANCE = 1m
where:
β is the magnetic flux density (gauss).
N is the number of turns in the receiving coil.
r n is the radius of the n th turn in the receiving coil (cm).
1
0.1
DISTANCE = 5mm
Given the geometry of the receiving coil in the ADuM440x and
an imposed requirement that the induced voltage be at most
0.01
1k
10k
100k
1M
10M
100M
50% of the 0.5 V margin at the decoder, a maximum allowable
magnetic field is calculated as shown in Figure 19.
100
10
1
0.1
0.01
MAGNETIC FIELD FREQUENCY (Hz)
Figure 20. Maximum Allowable Current
for Various Current-to-ADuM440x Spacings
Note that at combinations of strong magnetic field and high
frequency, any loops formed by printed circuit board traces may
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.
POWER CONSUMPTION
The supply current at a given channel of the ADuM440x isolator
is a function of the supply voltage, the channel’s data rate, and
the channel’s output load.
0.001
1k 10k 100k 1M 10M 100M
MAGNETIC FIELD FREQUENCY (Hz)
Figure 19. Maximum Allowable External Magnetic Flux Density
For each input channel, the supply current is given by
I DDI = I DDI (Q)
I DDI = I DDI (D) × (2 f ? f r ) + I DDI (Q)
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)
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
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
ADuM440x transformers. Figure 20 expresses these allowable
current magnitudes as a function of frequency for selected
distances. As can be seen, the ADuM440x are immune and can
be affected only by extremely large currents operated at high
frequency and very close to the component. For the 1 MHz
For each output channel, the supply current is given by
I DDO = I DDO (Q) f ≤ 0.5 f r
?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).
example noted, one would have to place a 0.5 kA current 5 mm
away from the ADuM440x to affect the component’s operation.
Rev. C | Page 16 of 20
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