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ADUM2251ARWZ-RL

更新时间: 2024-10-28 04:04:51
品牌 Logo 应用领域
亚德诺 - ADI /
页数 文件大小 规格书
16页 322K
描述
Hot-Swappable, Dual I2C Isolators, 5 kV

ADUM2251ARWZ-RL 数据手册

 浏览型号ADUM2251ARWZ-RL的Datasheet PDF文件第8页浏览型号ADUM2251ARWZ-RL的Datasheet PDF文件第9页浏览型号ADUM2251ARWZ-RL的Datasheet PDF文件第10页浏览型号ADUM2251ARWZ-RL的Datasheet PDF文件第12页浏览型号ADUM2251ARWZ-RL的Datasheet PDF文件第13页浏览型号ADUM2251ARWZ-RL的Datasheet PDF文件第14页 
ADuM2250/ADuM2251  
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,  
therefore establishing a 0.5 V margin in which induced voltages  
can be tolerated. The voltage induced across the receiving coil is  
given by  
STARTUP  
Both the VDD1 and VDD2 supplies have an under voltage lockout  
feature that prevents the signal channels from operating unless  
certain criteria is met. This feature is to avoid the possibility of  
input logic low signals from pulling down the I2C bus inadver-  
tently during power-up/power-down.  
V = (dβ / dt) Πr2 ; n =1, 2, ... N  
n
Criteria that must be met for the signal channels to be enabled  
are as follows:  
where:  
β is the magnetic flux density (gauss).  
rn is the radius of the nth turn in the receiving coil (cm).  
N is the number of turns in the receiving coil.  
Both supplies must be at least 2.5 V.  
At least 40 μs must elapse after both supplies exceed the  
internal start-up threshold of 2.0 V.  
Given the geometry of the receiving coil in the ADuM2250/  
ADuM2251 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 10.  
Until both of these criteria are met for both supplies, the  
ADuM2250/ADuM2251 outputs are pulled high thereby  
ensuring a startup that avoids any disturbances on the bus.  
Figure 8 and Figure 9 illustrate the supply conditions for fast  
and slow input supply slew rates.  
100  
10  
1
MINIMUM RECOMMENDED  
OPERATING SUPPLY, 3.0V  
SUPPLY VALID  
MINIMUM VALID SUPPLY, 2.5V  
0.1  
INTERNAL STARTUP  
THRESHOLD, 2.0V  
0.01  
40µs  
Figure 8. Start-Up Condition, Supply Slew Rate < 12.5 V/ms  
0.001  
1k  
10k  
100k  
1M  
10M  
100M  
MAGNETIC FIELD FREQUENCY (Hz)  
Figure 10. Maximum Allowable External Magnetic Flux Density  
MINIMUM RECOMMENDED  
OPERATING SUPPLY, 3.0V  
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 had 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).  
SUPPLY VALID  
MINIMUM VALID SUPPLY, 2.5V  
INTERNAL STARTUP  
THRESHOLD, 2.0V  
40µs  
Figure 9. Start-Up Condition, Supply Slew Rate > 12.5 V/ms  
MAGNETIC FIELD IMMUNITY  
The ADuM2250/ADuM2251 are extremely immune to external  
magnetic fields. The limitation on the magnetic field immunity  
of the ADuM2250/ADuM2251 is set by the condition in which  
induced voltage in the receiving coil of the transformer is suffi-  
ciently 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 ADuM2250/ADuM2251 is  
examined because it represents the most susceptible mode of  
operation.  
Rev. 0 | Page 11 of 16  
 
 
 
 
 

ADUM2251ARWZ-RL 替代型号

型号 品牌 替代类型 描述 数据表
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