ADUM3402ARWZ Analog Devices Inc, ADUM3402ARWZ Datasheet - Page 21

• Manufacturer Part Number: ADUM3402ARWZ
• Description: IC DIGITAL ISOLATOR 4CH 16-SOIC
• Manufacturer: Analog Devices Inc
• Series: iCoupler®r

Specifications of ADUM3402ARWZ

• Propagation Delay: 65ns
• Inputs - Side 1/side 2: 2/2
• Number Of Channels: 4
• Isolation Rating: 2500Vrms
• Voltage - Supply: 2.7 V ~ 5.5 V
• Data Rate: 1Mbps
• Output Type: Logic
• Package / Case: 16-SOIC (0.300", 7.5mm Width)
• Operating Temperature: -40°C ~ 105°C
• No. Of Channels: 4
• Supply Current: 2mA
• Supply Voltage Range: 2.7V To 5.5V
• Digital Ic Case Style: SOIC
• No. Of Pins: 16
• Operating Temperature Range: -40°C To +105°C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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, thus
establishing a 0.5 V margin in which induced voltages can be
tolerated. The voltage induced across the receiving coil is given by
where:
β is magnetic flux density (gauss).
N is the number of turns in the receiving coil.
r
Given the geometry of the receiving coil in the ADuM340x and
an imposed requirement that the induced voltage be at most
50% of the 0.5 V margin at the decoder, a maximum allowable
magnetic field is calculated as shown in Figure 19.
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, which 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 from the
ADuM340x transformers. Figure 20 expresses these allowable
current magnitudes as a function of frequency for selected
distances. As shown, the ADuM340x 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 ADuM340x to affect the operation of the
component.
n
is the radius of the n
V = (−dβ/dt)∑∏r
0.001
0.01
Figure 19. Maximum Allowable External Magnetic Flux Density
100
0.1
10
1
1k
10k
MAGNETIC FIELD FREQUENCY (Hz)
n
2
th
; N = 1, 2, … , N
turn in the receiving coil (cm).
100k
1M
10M
100M
Rev. A | Page 21 of 24
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.
POWER CONSUMPTION
The supply current at a given channel of the ADuM340x
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
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).
r
DDI (D)
DDI (Q)
L
DDO
is the input stage refresh rate (Mbps).
is the output load capacitance (pF).
I
I
I
I
1000
is the output supply voltage (V).
0.01
DDI
DDI
DDO
DDO
, I
, I
100
0.1
10
DDO (D)
DDO (Q)
1
1k
= I
= I
= (I
= I
ADuM3400/ADuM3401/ADuM3402
DISTANCE = 100mm
DDI (D)
DDI (Q)
DDO (Q)
DDO (D)
are the input and output dynamic supply currents
are the specified input and output quiescent
for Various Current-to-ADuM340x Spacings
Figure 20. Maximum Allowable Current
× (2f − f
DISTANCE = 5mm
+ (0.5 × 10
10k
MAGNETIC FIELD FREQUENCY (Hz)
r
) + I
100k
−3
DDI (Q)
) × C
L
× V
1M
DISTANCE = 1m
DDO
) × (2f − f
10M
r
f ≤ 0.5 f
f > 0.5 f
f ≤ 0.5 f
f > 0.5 f
) + I
100M
DDO (Q)
r
r
r
r