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參數(shù)資料
型號(hào): ADUM1100UR-RL7
廠商: ANALOG DEVICES INC
元件分類: 通信及網(wǎng)絡(luò)
英文描述: iCoupler Digital Isolator
中文描述: SPECIALTY TELECOM CIRCUIT, PDSO8
封裝: MS-012AA, SOIC-8
文件頁(yè)數(shù): 12/16頁(yè)
文件大小: 167K
代理商: ADUM1100UR-RL7
REV. E
ADuM1100
–12–
Given the geometry of the receiving coil in the ADuM1100 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 8.
MAGNETIC FIELD FREQUENCY (Hz)
100
M
D
0.001
1M
10
0.01
1k
10k
10M
0.1
1
100M
100k
Figure 8. Maximum Allowable External Magnetic Field
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 will 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 away from the ADuM1100
transformers. Figure 9 expresses these allowable current magnitudes
as a function of frequency for selected distances. As can be seen,
the ADuM1100 is extremely immune and can be affected only
by extremely large currents operated at high frequency and very
close to the component. For the 1 MHz example noted, one
would have to place a current of 0.5 kA 5 mm away from the
ADuM1100 to affect the component’s operation.
MAGNETIC FIELD FREQUENCY (Hz)
M
1000
100
10
1
0.1
0.01
1k
10k
100M
100k
1M
10M
DISTANCE = 5mm
DISTANCE = 1m
DISTANCE = 100mm
Figure 9. Maximum Allowable Current for
Various Current-to-ADuM1100 Spacings
Note that at combinations of strong magnetic field and high
frequency, any loops formed by printed circuit board traces could
induce sufficiently large error voltages to trigger the thresholds
of succeeding circuitry. Care should be taken in the layout of
such traces to avoid this possibility.
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