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ADUM1200 Datasheet(PDF) 16 Page - Analog Devices |
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ADUM1200 Datasheet(HTML) 16 Page - Analog Devices |
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16 / 20 page  ADuM1200/ADuM1201 Rev. B | Page 16 of 20 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 14. Maximum Allowable Current for Various Current-to-ADuM120x 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. POWER CONSUMPTION The supply current at a given channel of the ADuM120x isolator is a function of the supply voltage, the channel’s data rate, and the channel’s output load. For each input channel, the supply current is given by IDDI = IDDI (Q) f ≤ 0.5fr IDDI = IDDI (D) × (2f – fr) + IDDI (Q) f > 0.5fr for each output channel, the supply current is given by IDDO = IDDO (Q) f ≤ 0.5fr IDDO = (IDDO (D) + (0.5 × 10−3) × CLVDDO) × (2f – fr) + IDDO (Q) f > 0.5fr 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, half of the input data rate, NRZ signaling). 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 IDD1 and IDD2 supply current, the supply currents for each input and output channel corresponding to IDD1 and IDD2 are calculated and totaled. Figure 6 and Figure 7 provide per-channel supply currents as a function of data rate for an unloaded output condition. Figure 8 provides per- channel supply current as a function of data rate for a 15 pF output condition. Figure 9 through Figure 11 provide total IDD1 and IDD2 supply current as a function of data rate for ADuM1200 and ADuM1201 channel configurations. |
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