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參數(shù)資料
| 型號(hào)： | ADUM3100 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Digital Isolator, Enhanced System-Level ESD Reliability |
| 中文描述： | 數(shù)字隔離器，提高其系統(tǒng)級(jí)靜電放電的可靠性 |
| 文件頁(yè)數(shù)： | 15/16頁(yè) |
| 文件大小： | 289K |
| 代理商： | ADUM3100 |
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ADuM3100
Given the geometry of the receiving coil in the ADuM3100 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 18.
Rev. A | Page 15 of 16
MAGNETIC FIELD FREQUENCY (Hz)
Figure 18. Maximum Allowable External Magnetic Field
100
M
D
0.001
10
0.01
0.1
1
1k
10k
100k
1M
10M
100M
0
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 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 away from
the ADuM3100 transformers. Figure 19 shows the allowable
current magnitudes as a function of frequency for selected
distances. As can be seen, the ADuM3100 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 ADuM3100 to affect the component’s
operation.
MAGNETIC FIELD FREQUENCY (Hz)
1000
M
0.01
100
0.1
1
10
1k
10k
100k
1M
10M
100M
0
DISTANCE = 1m
DISTANCE = 100mm
DISTANCE = 5mm
Figure 19. Maximum Allowable Current for Current-to-ADuM3100 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.
POWER CONSUMPTION
The supply current of the ADuM3100 isolator is a function of
the supply voltage, the input data rate, and the output load.
The input supply current is given by
I
DDI
= I
DDI
(
Q
)
I
DDI
=
I
DDI (D)
× (2
f
–
f
r
) + I
DDI
(
Q
)
f
≤ 0.5
f
r
f > 0.5
f
r
The output supply current is given by
I
DDO
= I
DDO
(
Q
)
I
DDO
= (
I
DDO
(
D
)
+ (0.5 × 10
3
) ×
C
L
V
DDO
) × (2
f – f
r
) +
I
DDO
(
Q
)
f
≤ 0.5
f
r
f
> 0.5
f
r
where:
I
DDI (D)
,
I
DDO (D)
are the input and output dynamic supply currents
per channel (mA/Mbps).
C
L
is output load capacitance (pF).
V
DDO
is the output supply voltage (V).
f
is the input logic signal frequency (MHz, half of the input data
rate, NRZ signaling).
f
r
is the input stage refresh rate (Mbps).
I
DDI (Q)
,
I
DDO (Q)
are the specified input and output quiescent
supply currents (mA).
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