ADUM5230ARWZ Analog Devices Inc, ADUM5230ARWZ Datasheet - Page 11

• Manufacturer Part Number: ADUM5230ARWZ
• Description: IC ISOLATOR 2CH HBRIDGE 16-SOIC
• Manufacturer: Analog Devices Inc
• Series: iCoupler®r

Specifications of ADUM5230ARWZ

• Inputs - Side 1/side 2: 2/0
• Number Of Channels: 2
• Isolation Rating: 2500Vrms
• Voltage - Supply: 4.5 V ~ 5.5 V
• Propagation Delay: 100ns
• Output Type: Logic
• Package / Case: 16-SOIC (0.300", 7.5mm Width)
• Operating Temperature: -40°C ~ 105°C
• Device Type: Half Bridge
• Module Configuration: Half Bridge
• Peak Output Current: 300mA
• Output Resistance: 10ohm
• Input Delay: 100ns
• Output Delay: 100ns
• Supply Voltage Range: 4.5V To 5.5V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Data Rate: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

PROPAGATION DELAY-RELATED PARAMETERS
Propagation delay is a parameter that describes the time it takes
a logic signal to propagate through a component. The propagation
delay to a logic low output may differ from the propagation
delay to a logic high.
Pulse width distortion is the maximum difference between
these two propagation delay values and is an indication of how
accurately the input signal timing is preserved.
Channel-to-channel matching refers to the maximum amount
the propagation delay differs between channels within a single
ADuM5230 component.
DC CORRECTNESS AND MAGNETIC FIELD IMMUNITY
Positive and negative logic transitions at the isolator input
cause narrow (~1 ns) pulses to be sent to the decoder via the
transformer. The decoder is bistable and is, therefore, either set
or reset by the pulses, indicating input logic transitions. In the
absence of logic transitions at the input for more than 1 μs, a
periodic set of refresh pulses indicative of the correct input state
are sent to ensure dc correctness at the output. If the decoder
receives no internal pulses of more than about 5 μs, the input
side is assumed to be unpowered or nonfunctional, in which
case the isolator output is forced to a default state (see Table 9)
by the watchdog timer circuit.
The limitation on the ADuM5230 magnetic field immunity is set
by the condition in which induced voltage in the transformer
receiving coil is sufficiently large to either falsely set or reset the
decoder. The following analysis defines the conditions under
which this may occur.
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 ADuM5230 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 17.
INPUT (V
OUTPUT (V
n
is the radius of the n
V =
Ix
)
Ox
(
=
)
d
β
Figure 16. Propagation Delay Parameters
/
dt
)
∑
t
π
PLH
th
r
n
turn in the receiving coil (cm).
2
; n = 1, 2, … , N
t
PHL
50%
50%
Rev. 0 | Page 11 of 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 occurs 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
ADuM5230 transformers. Figure 18 expresses these allowable
current magnitudes as a function of frequency for selected
distances. As shown, the ADuM5230 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, the user would have to place a 0.5 kA current
5 mm away from the ADuM5230 to affect the operation of the
component.
Note that at combinations of strong magnetic field and high
frequency, any loops formed by PCB traces may induce error
voltages sufficiently large enough to trigger the thresholds of
0.001
1000
0.01
0.01
Figure 17. Maximum Allowable External Magnetic Flux Density
100
100
0.1
0.1
10
10
1
1
1k
1k
DISTANCE = 100mm
for Various Current-to-ADuM5230 Spacings
Figure 18. Maximum Allowable Current
10k
10k
DISTANCE = 5mm
MAGNETIC FIELD FREQUENCY (Hz)
MAGNETIC FIELD FREQUENCY (Hz)
100k
100k
1M
1M
DISTANCE = 1m
10M
10M
ADuM5230
100M
100M