ADUM1401CRW Analog Devices Inc, ADUM1401CRW Datasheet - Page 28

• Manufacturer Part Number: ADUM1401CRW
• Description: IC DIGITAL ISOLATOR 4CH 16-SOIC
• Manufacturer: Analog Devices Inc
• Series: iCoupler®r

Specifications of ADUM1401CRW

• Rohs Status: RoHS non-compliant
• Design Resources: 16-Bit Fully Isolated Voltage Output Module Using AD5662, ADuM1401, and External Amplifiers (CN0063) 16-Bit Fully Isolated 4 mA to 20 mA Output Module Using AD5662, ADuM1401, and External Amplifiers (CN0064) 16-Bit Fully Isolated Output Module Using AD5422 and ADuM1401 (CN0065)
• Inputs - Side 1/side 2: 3/1
• Number Of Channels: 4
• Isolation Rating: 2500Vrms
• Voltage - Supply: 2.7 V ~ 5.5 V
• Data Rate: 90Mbps
• Propagation Delay: 32ns
• Output Type: Logic
• Package / Case: 16-SOIC (0.300", 7.5mm Width)
• Operating Temperature: -40°C ~ 105°C

ADuM1400/ADuM1401/ADuM1402
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 occurs during a transmitted pulse
(and has the worst-case polarity), it reduces 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 from the
ADuM140x transformers. Figure 20 expresses these allowable
current magnitudes as a function of frequency for selected
distances. As shown, the ADuM140x is 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 noted, one would have to place a 0.5 kA current 5 mm
away from the ADuM140x to affect the operation of the
component.
Note that at combinations of strong magnetic field and high
frequency, any loops formed by printed circuit board traces
could induce error voltages sufficiently large enough to trigger
the thresholds 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
DISTANCE = 100mm
for Various Current-to-ADuM140x Spacings
Figure 20. Maximum Allowable Current
DISTANCE = 5mm
10k
MAGNETIC FIELD FREQUENCY (Hz)
100k
1M
DISTANCE = 1m
10M
100M
Rev. G | Page 28 of 32
POWER CONSUMPTION
The supply current at a given channel of the ADuM140x isolator
is a function of the supply voltage, the data rate of the channel,
and the output load of the channel.
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).
C
V
f is the input logic signal frequency (MHz); it is half of the input
data rate expressed in units of Mbps.
f
I
supply currents (mA).
To calculate the total V
currents for each input and output channel corresponding to
V
provide per-channel supply currents as a function of data rate
for an unloaded output condition. Figure 10 provides per-
channel supply current as a function of data rate for a 15 pF
output condition. Figure 11 through Figure 15 provide total
V
ADuM1400/ADuM1401/ADuM1402 channel configurations.
r
DDI (D)
DDI (Q)
L
DDO
is the input stage refresh rate (Mbps).
DD1
DD1
is the output load capacitance (pF).
I
I
I
I
and V
and V
is the output supply voltage (V).
DDI
DDI
DDO
DDO
, I
, I
DDO (D)
DDO (Q)
= I
= I
= (I
= I
DD2
DD2
DDI (Q)
DDI (D)
DDO (Q)
DDO (D)
are the input and output dynamic supply currents
are the specified input and output quiescent
are calculated and totaled. Figure 8 and Figure 9
supply current as a function of data rate for
× (2f − f
+ (0.5 × 10
DD1
r
) + I
and V
−3
DDI (Q)
) × C
DD2
L
supply current, the supply
× V
DDO
) × (2f − f
f ≤ 0.5 f
f ≤ 0.5 f
r
f > 0.5 f
f > 0.5 f
) + I
DDO (Q)
r
r
r
r