ADUM3300ARWZ Analog Devices Inc, ADUM3300ARWZ Datasheet - Page 18

• Manufacturer Part Number: ADUM3300ARWZ
• Description: IC DIGITAL ISOLATOR 3CH 16-SOIC
• Manufacturer: Analog Devices Inc
• Series: iCoupler®r

Specifications of ADUM3300ARWZ

• Propagation Delay: 65ns
• Inputs - Side 1/side 2: 3/0
• Number Of Channels: 3
• 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: 3
• Supply Current: 2.4mA
• 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

ADuM3300/ADuM3301
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).
r
N is the number of turns in the receiving coil.
Given the geometry of the receiving coil in the ADuM330x and
an imposed requirement that the induced voltage is at most
50% of the 0.5 V margin at the decoder, a maximum allowable
magnetic field is calculated as shown in Figure 16.
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 from the
ADuM330x transformers. Figure 17 expresses these allowable
current magnitudes as a function of frequency for selected
distances. The ADuM330x is extremely immune and can be
affected only by extremely large currents operated at high
frequency very close to the component (see Figure 17). For the
1 MHz example noted, a 0.5 kA current would have to be placed
5 mm away from the ADuM330x to affect the component’s
operation.
n
is the radius of the n
V = (−dβ/dt)
0.001
Figure 16. Maximum Allowable External Magnetic Flux Density
0.01
100
0.1
10
1
1k
10k
∑
π r
MAGNETIC FIELD FREQUENCY (Hz)
n
th
2
; n = 1, 2, … , N
turn in the receiving coil (cm).
100k
1M
10M
100M
Rev. A | Page 18 of 20
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 ADuM330x
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).
To calculate the total I
currents for each input and output channel corresponding to
V
channel input supply current as a function of data rate. Figure 7
and Figure 8 provide per-channel output supply current as a
function of data rate for an unloaded output condition and for a
15 pF output condition, respectively. Figure 9 through Figure 12
provide total V
rate for ADuM3300/ADuM3301 channel configurations.
r
DDI (D)
DDI (Q)
Figure 17. Maximum Allowable Current for Various Current-to-ADuM330x
L
DDO
is the input stage refresh rate (Mbps).
DD1
is the output load capacitance (pF).
I
I
I
I
and V
is the output supply voltage (V).
1000
DDI
DDI
DDO
DDO
, I
, I
0.01
100
0.1
10
DDO (D)
DDO (Q)
1
= I
= I
1k
= (I
= I
DISTANCE = 100mm
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 6 provides per-
DD1
× (2f − f
DISTANCE = 5mm
+ (0.5 × 10
and V
10k
MAGNETIC FIELD FREQUENCY (Hz)
DD1
DD2
r
and I
) + I
100k
supply current as a function of data
Spacing
−3
DDI (Q)
) × C
DD2
supply current, the supply
L
× V
1M
DISTANCE = 1m
DDO
) × (2f − f
10M
f ≤ 0.5 f
f ≤ 0.5 f
r
f > 0.5 f
f > 0.5 f
) + I
100M
DDO (Q)
r
r
r
r