Data Sheet
ADuM5210/ADuM5211/ADuM5212
The preceding magnetic flux density values correspond to specific
current magnitudes at given distances from the ADuM5210/
ADuM5211/ADuM5212 transformers. Figure 29 expresses these
allowable current magnitudes as a function of frequency for
selected distances. As shown in Figure 29, the ADuM5210/
ADuM5211/ADuM5212 are extremely immune and can be
affected only by extremely large currents operated at high
frequency very close to the component. For the 1 MHz example,
a 0.5 kA current, placed 5 mm away from the ADuM5210/
ADuM5211/ADuM5212, is required to affect component
operation.
POWER CONSUMPTION
The VDDP power supply input provides power only to the converter.
Power for the data channels is provided through VDD1 and VDD2
These power supplies can be connected to VDDP and VISO, if desired,
or the supplies can receive power from an independent source. The
converter should be treated as a standalone supply to be utilized at
the discretion of the designer.
.
The VDD1 or VDD2 supply current at a given channel of the
ADuM5210/ADuM5211/ADuM5212 isolator is a function of
the supply voltage, the data rate of the channel, and the output
load of the channel.
1k
For each input channel, the supply current is given by
DISTANCE = 1m
100
IDDI = IDDI(Q)
DDI = IDDI(D) × (2f − fr) + IDDI(Q)
f ≤ 0.5 fr
f > 0.5 fr
I
10
For each output channel, the supply current is given by
DISTANCE = 100mm
I
I
DDO = IDDO(Q)
f ≤ 0.5 fr
1
DDO = (IDDO(D) + (0.5 × 10−3) × CL × VDDO) × (2f − fr) + IDDO Q)
f > 0.5 fr
DISTANCE = 5mm
0.1
where:
DDI(D), IDDO(D) are the input and output dynamic supply currents
per channel (mA/Mbps).
DDI(Q), IDDO(Q) are the specified input and output quiescent
I
0.01
1k
10k
100k
1M
10M
100M
I
MAGNETIC FIELD FREQUENCY (Hz)
supply currents (mA).
Figure 29. Maximum Allowable Current for Various Current-to-ADuM521x
Spacings
f is the input logic signal frequency (MHz); it is half the input
data rate, expressed in units of Mbps.
fr is the input stage refresh rate (Mbps).
CL is the output load capacitance (pF).
Note that, in combinations of strong magnetic field and high
frequency, any loops formed by PCB traces can induce error
voltages sufficiently large to trigger the thresholds of succeeding
circuitry. Exercise care in the layout of such traces to avoid this
possibility.
V
DDO is the output supply voltage (V).
To calculate the total VDD1 and VDD2 supply current, the supply
currents for each input and output channel corresponding to
VDD1 and VDD2 are calculated and totaled. Figure 18 and
Figure 19 show per-channel supply currents as a function of
data rate for an unloaded output condition. Figure 20 shows the
per-channel supply current as a function of data rate for a 15 pF
output condition. Figure 21 through Figure 23 show the total
V
DD1 and VDD2 supply current as a function of data rate for
ADuM5210/ ADuM5211/ADuM5212 channel configurations.
Rev. 0 | Page 21 of 24