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参数资料
| 型号： | ADUM1281CRZ-RL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 17/20页 |
| 文件大小： | 0K |
| 描述： | ISOLATOR DGTL 3KVRMS 2CH 8SOIC |
| 标准包装： | 1,000 |
| 系列： | * |
I DDO = ( I DDO ( D ) + (0.5 × 10 ) × C L × V DDO ) × (2 f ? f r ) + I DDO ( Q )
DataSheet
For example, at a magnetic field frequency of 1 MHz, the
maximum allowable magnetic field of 0.08 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.
If such an event occurs, with the worst-case polarity, during a
transmitted pulse, it would reduce the received pulse from >1.0 V
to 0.75 V. This is 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 ADuM1280
transformers. Figure 14 expresses these allowable current magni-
tudes as a function of frequency for selected distances. The
ADuM1280 is very insensitive to external fields. Only extremely
large, high frequency currents, very close to the component
could potentially be a concern. For the 1 MHz example noted,
one would have to place a 0.2 kA current 5 mm away from the
ADuM1280 to affect component operation.
1000
ADuM1280/ADuM1281/ADuM1285/ADuM1286
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. Take care to avoid PCB
structures that form loops.
POWER CONSUMPTION
The supply current at a given channel of the ADuM128x
isolator is a function of the supply voltage, the data rate of
the channel, and the output load of the channel.
For each input channel, the supply current is given by
I DDI = I DDI ( Q ) f ≤ 0.5 f r
I DDI = I DDI (D) × (2 f ? f r ) + I DDI ( Q ) f > 0.5 f r
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
100
10
1
0.1
DISTANCE = 100mm
DISTANCE = 5mm
DISTANCE = 1m
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 the input
data rate, expressed in units of Mbps.
f r is the input stage refresh rate (Mbps) = 1/t r (μs).
I DDI (Q) , I DDO (Q) are the specified input and output quiescent
supply currents (mA).
0.01
1k
10k 100k 1M 10M
MAGNETIC FIELD FREQUENCY (Hz)
Figure 14. Maximum Allowable Current for
Various Current to ADuM1280 Spacings
100M
To calculate the total V DD1 and V DD2 supply current, the supply
currents for each input and output channel corresponding to
V DD1 and V DD2 are calculated and totaled. Figure 6 and Figure 7
show per-channel supply currents as a function of data rate for
an unloaded output condition. Figure 8 shows the per-channel
supply current as a function of data rate for a 15 pF output
condition. Figure 9 through Figure 11 show the total V DD1 and
V DD2 supply current as a function of data rate for ADuM1280/
ADuM1281 channel configurations.
Rev. B | Page 17 of 20
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相关代理商/技术参数 |
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| ADUM1281WARZ | 制造商:Analog Devices 功能描述: |
| ADUM1281WARZ-RL7 | 制造商:Analog Devices 功能描述: |
| ADUM1281WBRZ | 制造商:AD 制造商全称:Analog Devices 功能描述:3 kV RMS Dual Channel Digital Isolators |
| ADUM1281WBRZ-RL7 | 功能描述:General Purpose Digital Isolator 3000Vrms 2 Channel 25Mbps 25kV/μs CMTI 8-SOIC (0.154", 3.90mm Width) 制造商:analog devices inc. 系列:iCoupler? 包装:带卷（TR） 零件状态:有效 技术:磁耦合 类型:通用 隔离式电源:无 通道数:2 输入 - 输入侧 1/输入侧 2:1/1 通道类型:单向 电压 - 隔离:3000Vrms 共模瞬态抗扰度（最小值）:25kV/μs 数据速率:25Mbps 传播延迟 tpLH / tpHL（最大值）:35ns，35ns 脉宽失真（最大）:3ns 上升/下降时间（典型值）:2.5ns，2.5ns 电压 - 电源:3 V ~ 5.5 V 工作温度:-40°C ~ 125°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商器件封装:8-SOIC 标准包装:1,000 |
| ADUM1281WCRZ | 制造商:AD 制造商全称:Analog Devices 功能描述:3 kV RMS Dual Channel Digital Isolators |
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