Datasheet ADuM5210, ADuM5211, ADuM5212 (Analog Devices) - 21

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Data Sheet ADuM5210/ADuM5211/ADuM5212
The preceding magnetic flux density values correspond to specific
POWER CONSUMPTION
current magnitudes at given distances from the ADuM5210/ The VDDP power supply input provides power only to the converter. ADuM5211/ADuM5212 transformers. Figure 29 expresses these Power for the data channels is provided through VDD1 and VDD2. allowable current magnitudes as a function of frequency for These power supplies can be connected to VDDP and VISO, if desired, selected distances. As shown in Figure 29, the ADuM5210/ or the supplies can receive power from an independent source. The ADuM5211/ADuM5212 are extremely immune and can be converter should be treated as a standalone supply to be utilized at affected only by extremely large currents operated at high the discretion of the designer. frequency very close to the component. For the 1 MHz example, a 0.5 kA current, placed 5 mm away from the ADuM5210/ The VDD1 or VDD2 supply current at a given channel of the ADuM5211/ADuM5212, is required to affect component ADuM5210/ADuM5211/ADuM5212 isolator is a function of the operation. supply voltage, the data rate of the channel, and the output load of the channel.
1k
For each input channel, the supply current is given by
DISTANCE = 1m (kA) 100
IDDI = IDDI(Q) f ≤ 0.5 fr
NT E
IDDI = IDDI(D) × (2f − fr) + IDDI(Q) f > 0.5 fr
CURR E 10
For each output channel, the supply current is given by
ABL DISTANCE = 100mm W
IDDO = IDDO(Q) f ≤ 0.5 fr
O L 1 AL
I
DISTANCE = 5mm
DDO = (IDDO(D) + (0.5 × 10−3) × CL × VDDO) × (2f − fr) + IDDO Q)
UM
f > 0.5 fr
IM 0.1 AX
where:
M
IDDI(D), IDDO(D) are the input and output dynamic supply currents
0.01
per channel (mA/Mbps).
1k 10k 100k 1M 10M 100M
7 02 0- IDDI(Q), IDDO(Q) are the specified input and output quiescent
MAGNETIC FIELD FREQUENCY (Hz)
098 1 supply currents (mA). Figure 29. Maximum Allowable Current for Various Current-to-ADuM521x Spacings f is the input logic signal frequency (MHz); it is half the input data rate, expressed in units of Mbps. Note that, in combinations of strong magnetic field and high fr is the input stage refresh rate (Mbps). frequency, any loops formed by PCB traces can induce error CL is the output load capacitance (pF). voltages sufficiently large to trigger the thresholds of succeeding VDDO is the output supply voltage (V). circuitry. Exercise care in the layout of such traces to avoid this possibility. 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 18 and Figure 19 show per-channel supply currents as a function of data rate for an unloaded output condition. Figure 20 shows the per-channel supply current as a function of data rate for a 15 pF output condition. Figure 21 through Figure 23 show the total VDD1 and VDD2 supply current as a function of data rate for ADuM5210/ADuM5211/ADuM5212 channel configurations. Rev. D | Page 21 of 23 Document Outline FEATURES APPLICATIONS FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ELECTRICAL CHARACTERISTICS—5 V PRIMARY INPUT SUPPLY/5 V SECONDARY ISOLATED SUPPLY ELECTRICAL CHARACTERISTICS—3.3 V PRIMARY INPUT SUPPLY/3.3 V SECONDARY ISOLATED SUPPLY ELECTRICAL CHARACTERISTICS—5 V PRIMARY INPUT SUPPLY/3.3 V SECONDARY ISOLATED SUPPLY PACKAGE CHARACTERISTICS REGULATORY APPROVALS INSULATION AND SAFETY-RELATED SPECIFICATIONS DIN V VDE V 0884-10 (VDE V 0884-10) INSULATION CHARACTERISTICS RECOMMENDED OPERATING CONDITIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS TRUTH TABLE TYPICAL PERFORMANCE CHARACTERISTICS APPLICATIONS INFORMATION PCB LAYOUT THERMAL ANALYSIS PROPAGATION DELAY PARAMETERS EMI CONSIDERATIONS DC CORRECTNESS AND MAGNETIC FIELD IMMUNITY POWER CONSUMPTION INSULATION LIFETIME OUTLINE DIMENSIONS ORDERING GUIDE