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| 型号： | EVAL-ADUM3471EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 29/36页 |
| 文件大小： | 0K |
| 描述： | EVALUATION MODULE FOR ADUM3471 |
| 标准包装： | 1 |
| 系列： | iCoupler® |
| 主要目的： | 接口，数字式隔离器 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | ADuM3470，ADuM3471，ADuM3472，ADuM3473，ADuM3474 |
| 主要属性： | 2 个独立的 ADuM347x 电路 |
| 次要属性： | 3.3 V ~ 5.5 V 电源 |
| 已供物品： | 板 |
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Data Sheet
ADuM3470/ADuM3471/ADuM3472/ADuM3473/ADuM3474
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, periodic sets 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 for more than approximately 5 μs, the input side is assumed
to be unpowered or nonfunctional, and the isolator output is forced
This situation should occur in the ADuM347x devices only
during power-up and power-down operations.
The limitation on the magnetic field immunity of the ADuM347x
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 can occur.
The 3.3 V operating condition of the ADuM347x is examined
because it represents the most susceptible mode of operation.
The pulses at the transformer output have an amplitude of >1.0 V.
The decoder has a sensing threshold of approximately 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
V = ( ?dβ/dt ) ∑ π r n 2 ; n = 1, 2, …, N
where:
β is the magnetic flux density (gauss).
r n is the radius of the n th turn in the receiving coil (cm).
N is the number of turns in the receiving coil.
Given the geometry of the receiving coil in the ADuM347x and
an imposed requirement that the induced voltage be, at most,
50% of the 0.5 V margin at the decoder, a maximum allowable
100
10
1
0.1
0.01
0.001
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 voltage is approxi-
mately 50% of the sensing threshold and does not cause a faulty
output transition. Similarly, if such an event occurs during a
transmitted pulse (and is of 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
ADuM347x transformers. Figure 44 expresses these allowable
current magnitudes as a function of frequency for selected
distances. As shown in Figure 44, the ADuM347x 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, a 0.5 kA current must be placed 5 mm away
from the ADuM347x to affect the operation of the component.
1k
DISTANCE = 1m
100
10
DISTANCE = 100mm
1
DISTANCE = 5mm
0.1
0.01
1k 10k 100k 1M 10M 100M
MAGNETIC FIELD FREQUENCY (Hz)
Figure 44. Maximum Allowable Current
for Various Current-to- ADuM347x Spacings
At combinations of strong magnetic field and high frequency, any
loops formed by PCB traces can induce error voltages sufficiently
large to trigger the thresholds of succeeding circuitry. Care should
be taken in the layout of such traces to avoid this possibility.
1k
10k
100k
1M
10M
100M
MAGNETIC FIELD FREQUENCY (Hz)
Figure 43. Maximum Allowable External Magnetic Flux Density
Rev. A | Page 29 of 36
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