ADUM2200BRWZ 查看數據表（PDF） - Analog Devices

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ADUM2200BRWZ

(ADUM2200 / ADUM2201) Dual-Channel Digital Isolators 5 kV

Analog Devices 

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 were to occur during a transmitted

pulse (and was of the worst-case polarity), it would reduce 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 away from the

ADuM220x transformers. Figure 15 expresses these allowable

current magnitudes as a function of frequency for selected

distances. As can be seen, the ADuM220x is immune and can

be affected only by extremely large currents operated at high

frequency and very close to the component. For the 1 MHz

example noted previously, one would have to place a 0.5 kA current

5 mm away from the ADuM220x to affect operation of the

component.

1000

DISTANCE = 1m

100

10

DISTANCE = 100mm

1

DISTANCE = 5mm

0.1

0.01

1k

10k

100k

1M

10M

MAGNETIC FIELD FREQUENCY (Hz)

Figure 15. Maximum Allowable Current

for Various Current-to-ADuM220x Spacings

100M

Note that at combinations of strong magnetic field and high

frequency, any loops formed by printed circuit board traces can

induce sufficiently large error voltages to trigger the thresholds

of succeeding circuitry. Care should be taken in the layout of

such traces to avoid this possibility.

ADuM2200/ADuM2201

POWER CONSUMPTION

The supply current at a given channel of the ADuM220x

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) × 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, 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

as a function of data rate for ADuM2200/ADuM2201 channel

configurations.

Rev. 0 | Page 17 of 20

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