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參數(shù)資料
| 型號： | ADUM1250 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Hot Swappable Dual I2C Isolators |
| 中文描述： | 熱插拔雙的I2C隔離器 |
| 文件頁數(shù)： | 11/12頁 |
| 文件大小： | 201K |
| 代理商： | ADUM1250 |
ADuM1250/ADuM1251
TYPICAL APPLICATION DIAGRAM
Rev. 0 | Page 11 of 12
0
V
DD
GND
1
SDA
1
GND
2
V
2
SDA
2
ADuM1250
SCL
1
SCL
2
I
2
C BUS
1
2
3
4
8
7
6
5
Figure 9. Typical Isolated I
2
C Interface using ADuM1250
MAGNETIC FIELD IMMUNITY
The ADuM1250 is extremely immune to external magnetic
fields. The limitation on the ADuM1250’s magnetic field
immunity is set by the condition in which induced voltage in
the transformer’s receiving coil is sufficiently large to either
falsely set or reset the decoder. The following analysis defines
the conditions under which this may occur. The 3 V operating
condition of the ADuM1250 is examined because it represents
the most susceptible mode of operation.
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
∑
=
Π
=
n
r
dt
d
V
n
,
;
)
/
β
(
N
...
2
where:
β
is the magnetic flux density (gauss).
N
is the number of turns in the receiving coil.
r
n
is the radius of the nth turn in the receiving coil (cm).
Given the geometry of the receiving coil in the ADuM1250 and
an imposed requirement that the induced voltage is at most
50% of the 0.5 V margin at the decoder, a maximum allowable
magnetic field is calculated, as shown in Figure 10.
MAGNETIC FIELD FREQUENCY (Hz)
100
M
D
0.001
1M
10
0.01
1k
10k
10M
0.1
1
100M
100k
0
Figure 10. Maximum Allowable External Magnetic Flux Density
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 occurs during a transmitted pulse
(with the worst-case polarity), it reduces the received pulse
from > 1.0 V to 0.75 V. Note that 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
ADuM1250 transformers. Figure 11 expresses these allowable
current magnitudes as a function of frequency for selected
distances. As shown in Figure 11, the ADuM1250 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, one would have to place a 0.5 kA
current 5 mm away from the ADuM1250 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
0
Figure 11. Maximum Allowable Current for Various
Current-to-ADuM1250 Spacings
Note that at combinations of strong magnetic fields and high
frequencies, any loops formed by printed circuit board traces
could induce sufficiently large error voltages to trigger the
threshold of succeeding circuitry. Care should be taken in the
layout of such traces to avoid this possibility.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ADUM1250_VD | 制造商:AD 制造商全稱:Analog Devices 功能描述:Hot Swappable, Dual I2C Isolators |
| ADUM1250ARZ | 功能描述:IC ISOLATOR 1MBPS 4CH 2.5K 8SOIC RoHS:是 類別:隔離器 >> 數(shù)字隔離器 系列:iCoupler® 標準包裝:66 系列:iCoupler® 輸入 - 1 側(cè)/2 側(cè):2/2 通道數(shù):4 電源電壓:3.3V，5V 電壓 - 隔離:2500Vrms 數(shù)據(jù)速率:25Mbps 傳輸延遲:60ns 輸出類型:邏輯 封裝/外殼:20-SSOP（0.209"，5.30mm 寬） 供應商設備封裝:20-SSOP 包裝:管件 工作溫度:-40°C ~ 105°C |
| ADUM1250ARZ | 制造商:Analog Devices 功能描述:IC DIGITAL COUPLER HYBRID SOP 8PIN 制造商:Analog Devices 功能描述:IC, DIGITAL ISOLATOR, 150NS, SOIC-8 |
| ADUM1250ARZ-RL7 | 功能描述:IC ISOLATOR 1MBPS 4CH 2.5K 8SOIC RoHS:是 類別:隔離器 >> 數(shù)字隔離器 系列:iCoupler® 產(chǎn)品培訓模塊:IsoLoop® Isolator 標準包裝:50 系列:IsoLoop® 輸入 - 1 側(cè)/2 側(cè):5/0 通道數(shù):5 電源電壓:3 V ~ 5.5 V 電壓 - 隔離:2500Vrms 數(shù)據(jù)速率:110Mbps 傳輸延遲:12ns 輸出類型:CMOS 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:16-SOIC N 包裝:管件 工作溫度:-40°C ~ 85°C 其它名稱:390-1053-5 |
| ADUM1250SRZ | 功能描述:IC ISOLATOR 1MBPS 4CH 2.5K 8SOIC RoHS:是 類別:隔離器 >> 數(shù)字隔離器 系列:iCoupler® 標準包裝:66 系列:iCoupler® 輸入 - 1 側(cè)/2 側(cè):2/2 通道數(shù):4 電源電壓:3.3V，5V 電壓 - 隔離:2500Vrms 數(shù)據(jù)速率:25Mbps 傳輸延遲:60ns 輸出類型:邏輯 封裝/外殼:20-SSOP（0.209"，5.30mm 寬） 供應商設備封裝:20-SSOP 包裝:管件 工作溫度:-40°C ~ 105°C |
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