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| 型号： | ADUM1285ARZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 16/20页 |
| 文件大小： | 0K |
| 描述： | ISOLATOR DGTL 3KVRMS 2CH 8SOIC |
| 标准包装： | 98 |
| 系列： | * |
ADuM1280/ADuM1281/ADuM1285/ADuM1286
APPLICATIONS INFORMATION
PC BOARD LAYOUT
The ADuM128x digital isolator requires no external interface
circuitry for the logic interfaces. Power supply bypassing is
strongly recommended at both input and output supply pins
V DD1 and V DD2 (see Figure 12). The capacitor value should be
between 0.01 μF and 0.1 μF. The total lead length between both
ends of the capacitor and the input power supply pin should not
exceed 20 mm.
The ADuM128x can readily meet CISPR 22 Class A (and
FCC Class A) emissions standards, as well as the more
stringent CISPR 22 Class B (and FCC Class B) standards in
an unshielded environment, with proper PCB design choices.
Refer to the AN-1109 Applicaton Note, Recommendations for
Control of Radiated Emissions with i Coupler Devices for PCB-
related EMI mitigation techniques, including board layout and
stack-up issues.
PROPAGATION DELAY-RELATED PARAMETERS
Propagation delay is a parameter that describes the time it takes
a logic signal to propagate through a component. The input-to-
output propagation delay time for a high-to-low transition may
differ from the propagation delay time of a low-to-high
transition.
INPUT (V Ix ) 50%
Data Sheet
DC CORRECTNESS AND MAGNETIC FIELD
IMMUNITY
Positive and negative logic transitions at the isolator input
cause narrow (~1 ns) pulses to be sent via the transformer to
the decoder. The decoder is bistable and is, therefore, either set
or reset by the pulses indicating input logic transitions. In the
absence of logic transitions at the input for more than ~1.6 μs,
a periodic set of refresh pulses indicative of the correct input
state are sent to ensure dc correctness at the output.
If the decoder receives no pulses for more than about 6.4 μs, the
input side is assumed to be unpowered or nonfunctional, in which
case, the isolator output is forced to a default low state by the
watchdog timer circuit.
The limitation on the device’s magnetic field immunity is set
by the condition in which induced voltage in the transformer
receiving coil is sufficiently large to either falsely set or reset the
decoder. The following analysis defines such conditions. The
ADuM1280 is examined in a 3 V operating condition because it
represents the most susceptible mode of operation of this product.
The pulses at the transformer output have an amplitude greater
than 1.5 V. The decoder has a sensing threshold of about 1.0 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
t PLH
t PHL
V = (? dβ / dt )∑ π r n 2 ; n = 1, 2, …, N
OUTPUT (V Ox ) 50%
Figure 12. Propagation Delay Parameters
Pulse width distortion is the maximum difference between
these two propagation delay values and an indication of how
accurately the timing of the input signal is preserved.
Channel-to-channel matching refers to the maximum amount
the propagation delay differs between channels within a single
ADuM128x component.
Propagation delay skew refers to the maximum amount the
propagation delay differs between multiple ADuM128x
components operating under the same conditions.
where:
β is the magnetic flux density.
r n is the radius of the n th turn in the receiving coil.
N is the number of turns in the receiving coil.
Given the geometry of the receiving coil in the ADuM1280 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 13.
100
10
1
0.1
0.01
0.001
1k
10k
100k
1M
10M
100M
MAGNETIC FIELD FREQUENCY (Hz)
Figure 13. Maximum Allowable External Magnetic Flux Density
Rev. B | Page 16 of 20
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| ADUM1285ARZ-RL7 | 功能描述:ISOLATOR DGTL 3KVRMS 2CH 8SOIC RoHS:是 类别:隔离器 >> 数字隔离器 系列:* 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 |
| ADUM1285BRZ | 功能描述:ISOLATOR DGTL 3KVRMS 2CH 8SOIC RoHS:是 类别:隔离器 >> 数字隔离器 系列:* 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 |
| ADUM1285BRZ-RL7 | 功能描述:ISOLATOR DGTL 3KVRMS 2CH 8SOIC RoHS:是 类别:隔离器 >> 数字隔离器 系列:* 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 |
| ADUM1285CRZ | 功能描述:ISOLATOR DGTL 3KVRMS 2CH 8-SOIC 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 |
| ADUM1285CRZ-RL7 | 功能描述:ISOLATOR DGTL 3KVRMS 2CH 8SOIC RoHS:是 类别:隔离器 >> 数字隔离器 系列:* 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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