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ADUM1411 Datasheet(PDF) 19 Page - Analog Devices |
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ADUM1411 Datasheet(HTML) 19 Page - Analog Devices |
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19 / 20 page  ADuM1410/ADuM1411/ADuM1412 Rev. E | Page 19 of 20 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 (and was 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. The preceding magnetic flux density values correspond to specific current magnitudes at given distances from the ADuM141x transformers. Figure 19 expresses these allowable current magnitudes as a function of frequency for selected distances. As shown, the ADuM141x is extremely immune and can be affected only by extremely large currents operated at high frequency very close to the component. For the 1 MHz example noted, a 0.5 kA current needed to be placed 5 mm away from the ADuM141x to affect the operation of the component. MAGNETIC FIELD FREQUENCY (Hz) 1000 100 10 1 0.1 0.01 1k 10k 100M 100k 1M 10M DISTANCE = 5mm DISTANCE = 1m DISTANCE = 100mm Figure 19. Maximum Allowable Current for Various Current-to-ADuM141x Spacings Note that at combinations of strong magnetic field and high frequency, any loops formed by printed circuit board traces could induce error voltages sufficiently large enough to trigger the thresholds of succeeding circuitry. Care should be taken in the layout of such traces to avoid this possibility. POWER CONSUMPTION The supply current at a given channel of the ADuM141x 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 IDDI = IDDI (Q) f ≤ 0.5 fr IDDI = IDDI (D) × (2f − fr) + IDDI (Q) f > 0.5 fr For each output channel, the supply current is given by IDDO = IDDO (Q) f ≤ 0.5 fr IDDO = (IDDO (D) + (0.5 × 10−3) × CL × VDDO) × (2f − fr) + IDDO (Q) f > 0.5 fr where: IDDI (D), IDDO (D) are the input and output dynamic supply currents per channel (mA/Mbps). CL is the output load capacitance (pF). VDDO is the output supply voltage (V). f is the input logic signal frequency (MHz); it is half of the input data rate expressed in units of Mbps. fr is the input stage refresh rate (Mbps). IDDI (Q), IDDO (Q) are the specified input and output quiescent supply currents (mA). To calculate the total VDD1 and VDD2 supply current, the supply currents for each input and output channel corresponding to VDD1 and VDD2 are calculated and totaled. Figure 8 and Figure 9 provide per-channel supply currents as a function of data rate for an unloaded output condition. Figure 10 provides per- channel supply current as a function of data rate for a 15 pF output condition. Figure 11 through Figure 15 provide total VDD1 and VDD2 supply current as a function of data rate for ADuM1410/ADuM1411/ADuM1412 channel configurations. |
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