ADUM7510BRQZ【PDF 9/12 页】IC DGTL ISOLATOR 5CH 16QSOP

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Data Sheet

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

DISTANCE = 5mm

ADuM7510

For each output channel, the supply current is given by

I DDO = I DDO (Q) f ≤ 0.5 f r

I DDO = ( I DDO (D) + (0.5 × 10 ?3 ) × C L × V DDO ) × (2 f ? f r ) + I DDO (Q)

f ≤ 0.5 f r

where:

I DDI (D) , I DDO (D) are the input and output dynamic supply currents

per channel (mA/Mbps).

C L is the output load capacitance (pF).

V DDO is the output supply voltage (V).

f is the input logic signal frequency (MHz, half of the input data

rate, NRZ signaling).

f r is the input stage refresh rate (Mbps).

I DDI (Q) , I DDO (Q) are the specified input and output quiescent

supply currents (mA).

To calculate the total I DD1 and I DD2 supply current, the supply

currents for each input and output channel corresponding to

I DD1 and I DD2 are calculated and totaled. Figure 4 and Figure 5

0.1

0.01

DISTANCE = 100mm

DISTANCE = 1m

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

1k

10k 100k 1M 10M

MAGNETIC FIELD FREQUENCY (Hz)

Figure 12. Maximum Allowable Current for

Various Current to ADuM7510 Spacings

100M

output condition. Figure 7 and Figure 8 provide total I DD1 and

I DD2 supply current as a function of the data rate for ADuM7510

products.

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

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 V DDx 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

I DDI = I DDI (Q)

I DDI = I DDI (D) × (2 f ? f r ) + I DDI (Q)

f ≤ 0.5 f r

f > 0.5 f r

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.

Rev. B | Page 9 of 12

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