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ADuM7510BRQZ Datasheet(PDF) 9 Page - Analog Devices |
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ADuM7510BRQZ Datasheet(HTML) 9 Page - Analog Devices |
9 / 12 page ADuM7510 Rev. A | Page 9 of 12 The preceding magnetic flux density values correspond to specific current magnitudes at given distances away from the ADuM7510 transformers. Figure 12 expresses these allowable current magni- tudes as a function of frequency for selected distances. The ADuM7510 is very insensitive to external fields. Only extremely large, high frequency currents, very close to the component can potentially be a concern. For the 1 MHz example noted, a 1.2 kA current must be placed 5 mm away from the ADuM7510 to affect component operation. 1000 100 10 1 0.1 0.01 1k 10k 100k 1M 10M 100M MAGNETIC FIELD FREQUENCY (Hz) DISTANCE = 5mm DISTANCE = 100mm DISTANCE = 1m Figure 12. Maximum Allowable Current for Various Current to ADuM7510 Spacings Note that at combinations of strong magnetic field and high frequency, any loops formed by PCB traces can induce sufficiently large error voltages to trigger the thresholds of succeeding circuitry. Take care to avoid PCB structures that form loops. POWER CONSUMPTION The supply current at a given channel of the ADuM7510 isolator is a function of the supply voltage, the channel data rate, and the channel 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) × CL × VDDO) × (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 4 and Figure 5 provide per-channel supply currents as a function of the data rate for an unloaded output condition. Figure 6 provides per- channel supply current as a function of the data rate for a 15 pF output condition. Figure 7 and Figure 8 provide total IDD1 and IDD2 supply current as a function of the data rate for ADuM7510 products. POWER-UP/POWER-DOWN CONSIDERATIONS The ADuM7510 behaves as specified in Table 8 during power- up and power-down operations. However, the part can transfer incorrect data when the power supplies are below the minimum operating voltage but the internal circuits are not completely off. Power-up/power-down errors can occur at VDDx voltage near the operating threshold of 1.9 V. The encoder generates data pulses at low amplitude. The detector can miss data pulses that are near the detection threshold. If the transferring state is a logic high, the encoder generates a pair of pulses; the decoder can reject one of the pulses for low amplitude. A single pulse is interpreted as a logic low, and the output can be placed in the wrong logic state for that refresh cycle. Glitch-free operation is possible by following these recommendations. • Slew the power on or off as quickly as possible. • Use the default low operating mode by holding the inputs low until power is stable. |
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