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参数资料
| 型号： | ADUM2250ARWZ-RL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 11/16页 |
| 文件大小： | 0K |
| 描述： | IC ISOLATOR I2C DUAL 5KV 16SOIC |
| 标准包装： | 1,000 |
| 系列： | iCoupler® |
| 输入 - 1 侧/2 侧： | 2/2 |
| 通道数： | 2 |
| 电源电压： | 3 V ~ 5.5 V |
| 电压 - 隔离： | 5000Vrms |
| 数据速率： | 1Mbps |
| 输出类型： | I²C? |
| 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
STARTUP
Both the V DD1 and V DD2 supplies have an undervoltage lockout
feature that prevents the signal channels from operating unless
certain criteria are met. This feature prevents the possibility of
input logic low signals pulling down the I 2 C bus inadvertently
during power-up/power-down.
For the signal channels to be enabled, the following criteria
must be met:
? 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.
Until both 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.
ADuM2250/ADuM2251
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.
The pulses at the transformer output have an amplitude greater
than 1.0 V. The decoder has a sensing threshold at approximately
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 = ( ?dβ/dt ) ∑ π r n 2 ; n = 1, 2, … , N
where:
β is the magnetic flux density (gauss).
r n is the radius of the n th turn in the receiving coil (cm).
MINIMUM RECOMMENDED
OPERATING SUPPLY, 3.0V
MINIMUM VALID SUPPLY, 2.5V
INTERNAL START-UP
THRESHOLD, 2.0V
40μs
SUPPLY VALID
N is the number of turns in the receiving coil.
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.
100
Figure 8. Start-Up Condition, Supply Slew Rate > 12.5 V/ms
10
1
MINIMUM RECOMMENDED
OPERATING SUPPLY, 3.0V
SUPPLY VALID
MINIMUM VALID SUPPLY, 2.5V
INTERNAL START-UP
THRESHOLD, 2.0V
40μs
0.1
0.01
0.001
Figure 9. Start-Up Condition, Supply Slew Rate < 12.5 V/ms
1k
10k
100k
1M
10M
100M
MAGNETIC FIELD FREQUENCY (Hz)
Figure 10. Maximum Allowable External Magnetic Flux Density
For example, at a magnetic field frequency of 1 MHz, the maxi-
mum allowable magnetic field of 0.2 kgauss induces a voltage of
0.25 V at the receiving coil. This voltage is approximately 50% of
the sensing threshold and does not cause a faulty output transition.
Similarly, if such an event occurs during a transmitted pulse (and
is 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.
Rev. B | Page 11 of 16
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相关代理商/技术参数 |
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| ADUM2250WARWZ | 功能描述:I2C Digital Isolator 5000Vrms 2 Channel 1Mbps 25kV/μs CMTI 16-SOIC (0.295", 7.50mm Width) 制造商:analog devices inc. 系列:iCoupler? 包装:管件 零件状态:有效 技术:磁耦合 类型:I2C 隔离式电源:无 通道数:2 输入 - 输入侧 1/输入侧 2:2/2 通道类型:双向 电压 - 隔离:5000Vrms 共模瞬态抗扰度（最小值）:25kV/μs 数据速率:1Mbps 传播延迟 tpLH / tpHL（最大值）:- 脉宽失真（最大）:145ns，85ns 上升/下降时间（典型值）:- 电压 - 电源:3 V ~ 5.5 V 工作温度:-40°C ~ 105°C 封装/外壳:16-SOIC（0.295"，7.50mm 宽） 供应商器件封装:16-SOIC 标准包装:47 |
| ADUM2250WARWZ-RL | 功能描述:I2C Digital Isolator 5000Vrms 2 Channel 1Mbps 25kV/μs CMTI 16-SOIC (0.295", 7.50mm 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:I2C 隔离式电源:无 通道数:2 输入 - 输入侧 1/输入侧 2:2/2 通道类型:双向 电压 - 隔离:5000Vrms 共模瞬态抗扰度（最小值）:25kV/μs 数据速率:1Mbps 传播延迟 tpLH / tpHL（最大值）:- 脉宽失真（最大）:145ns，85ns 上升/下降时间（典型值）:- 电压 - 电源:3 V ~ 5.5 V 工作温度:-40°C ~ 105°C 封装/外壳:16-SOIC（0.295"，7.50mm 宽） 供应商器件封装:16-SOIC 标准包装:1,000 |
| ADUM2251 | 制造商:AD 制造商全称:Analog Devices 功能描述:Hot-Swappable, Dual I2C Isolators, 5 kV |
| ADUM2251ARIZ | 功能描述:ISOLATOR DL I2C HOT-SWAP 16SOIC RoHS:是 类别:隔离器 >> 数字隔离器 系列:iCoupler® 标准包装:66 系列:iCoupler® 输入 - 1 侧/2 侧:2/2 通道数:4 电源电压:3.3V，5V 电压 - 隔离:2500Vrms 数据速率:25Mbps 传输延迟:60ns 输出类型:逻辑 封装/外壳:20-SSOP（0.209"，5.30mm 宽） 供应商设备封装:20-SSOP 包装:管件 工作温度:-40°C ~ 105°C |
| ADUM2251ARIZ-RL | 功能描述:ISOLATOR DL I2C HOT-SWAP 16SOIC RoHS:是 类别:隔离器 >> 数字隔离器 系列:iCoupler® 产品培训模块:IsoLoop® Isolator 标准包装:50 系列:IsoLoop® 输入 - 1 侧/2 侧:5/0 通道数:5 电源电压:3 V ~ 5.5 V 电压 - 隔离:2500Vrms 数据速率:110Mbps 传输延迟:12ns 输出类型:CMOS 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC N 包装:管件 工作温度:-40°C ~ 85°C 其它名称:390-1053-5 |
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