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参数资料
| 型号： | ADUM3400BRWZ-RL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 21/24页 |
| 文件大小： | 0K |
| 描述： | IC DIGITAL ISOLATOR 4CH 16-SOIC |
| 标准包装： | 1,000 |
| 系列： | iCoupler® |
| 输入 - 1 侧/2 侧： | 4/0 |
| 通道数： | 4 |
| 电源电压： | 2.7 V ~ 5.5 V |
| 电压 - 隔离： | 2500Vrms |
| 数据速率： | 10Mbps |
| 传输延迟： | 32ns |
| 输出类型： | 逻辑 |
| 封装/外壳： | 16-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 16-SOIC W |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 105°C |
Data Sheet
ADuM3400/ADuM3401/ADuM3402
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
V = ( ?d β /dt )∑∏ r n2 ; N = 1, 2, … , N
where:
β is magnetic flux density (gauss).
N is the number of turns in the receiving coil.
r n is the radius of the n th turn in the receiving coil (cm).
1000
100
10
1
0.1
DISTANCE = 100mm
DISTANCE = 5mm
DISTANCE = 1m
Given the geometry of the receiving coil in the ADuM340x 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 19.
0.01
1k
10k 100k 1M 10M
MAGNETIC FIELD FREQUENCY (Hz)
Figure 20. Maximum Allowable Current
for Various Current-to- ADuM340x Spacings
100M
100
10
1
0.1
0.01
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 ADuM340x
isolator is a function of the supply voltage, the channel’s data
rate, and the channel’s output load.
0.001
1k
10k 100k 1M 10M
MAGNETIC FIELD FREQUENCY (Hz)
100M
For each input channel, the supply current is given by
I DDI = I DDI ( Q ) f ≤ 0.5 f r
Figure 19. Maximum Allowable External Magnetic Flux Density
I DDI = I DDI (D) × (2 f ? f r ) + I DDI ( Q )
f > 0.5 f r
I DDO = ( I DDO ( D ) + (0.5 × 10 ) × C L × V DDO ) × (2 f ? f r ) + I DDO ( Q )
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, which 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
ADuM340x transformers. Figure 20 expresses these allowable
current magnitudes as a function of frequency for selected
distances. As shown, the ADuM340x 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, one would have to place a 0.5 kA current 5 mm
away from the ADuM340x to affect the operation of the
For each output channel, the supply current is given by
I DDO = I DDO ( Q ) f ≤ 0.5 f r
?3
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 the output load capacitance (pF).
V DDO is the output supply voltage (V).
f is the input logic signal frequency (MHz); it is half of the input
data rate expressed in units of Mbps.
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).
component.
Rev. C | Page 21 of 24
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