ADuM3210WARZ AD [Analog Devices], ADuM3210WARZ Datasheet - Page 17

• Manufacturer Part Number: ADuM3210WARZ
• Description: Dual-Channel Digital Isolators, Enhanced System-Level ESD Reliability
• Manufacturer: AD [Analog Devices]

Data Sheet
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 had the worst-case polarity), it would reduce the
received pulse from >1.0 V to 0.75 V, which is 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
ADuM3210/ADuM3211
these allowable current magnitudes as a function of frequency
for selected distances. As shown, the
are immune and can be affected only by extremely large currents
operated at a high frequency and very close to the component.
For the 1 MHz example, a 0.5 kA current would have to be placed
5 mm away from the
operation of the component.
Note that at combinations of strong magnetic fields and high
frequencies, any loops formed by the printed circuit board
(PCB) traces may 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.
1000
0.01
100
0.1
10
1
1k
Figure 14. Maximum Allowable Current for Various
DISTANCE = 100mm
Current-to-ADuM3210/-ADuM3211 Spacings
DISTANCE = 5mm
10k
MAGNETIC FIELD FREQUENCY (Hz)
ADuM3210/ADuM3211
transformers. Figure 14 expresses
100k
ADuM3210/ADuM3211
1M
DISTANCE = 1m
10M
to affect the
100M
Rev. E | Page 17 of 20
POWER CONSUMPTION
The supply current at a given channel of the ADuM3210/
ADuM3211
data rate, and channel output load.
For each input channel, the supply current is given by
For each output channel, the supply current is given by
where:
I
per channel (mA/Mbps).
I
supply currents (mA).
C
V
f is the input logic signal frequency (MHz, half of the input data
rate, NRZ signaling).
f
To calculate the total I
currents for each input and output channel corresponding to
I
Figure 6 provides the input supply currents per channel as a
function of data rate. Figure 7 and Figure 8 provide the output
supply currents per channel as a function of data rate for an
unloaded output condition and for a 15 pF output condition,
respectively. Figure 9 through Figure 11 provide total I
I
and
r
DDI (D)
DDI (Q)
DD1
DD2
L
DDO
is the input stage refresh rate (Mbps).
is the output load capacitance (pF).
and I
supply current as a function of data rate for the
ADuM3211
I
I
I
I
is the output supply voltage (V).
DDI
DDI
DDO
DDO
, I
, I
DDO (D)
DDO (Q)
= I
= I
= I
= (I
DD2
DDI (Q)
DDI (D)
DDO (Q)
isolator is a function of the supply voltage, channel
are calculated and totaled.
DDO (D)
are the input and output dynamic supply currents
are the specified input and output quiescent
channel configurations.
× (2f – f
+ (0.5 × 10
DD1
r
) + I
and I
ADuM3210/ADuM3211
DDI (Q)
−3
DD2
) × C
supply current, the supply
L
V
DDO
) × (2f – f
r
ADuM3210
) + I
f ≤ 0.5f
f ≤ 0.5f
f > 0.5f
f > 0.5f
DD1
DDO (Q)
and
r
r
r
r