ADUM2211WSRWZ

更新时间： 2024-01-10 05:14:08

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数据手册

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ADUM2211WSRWZ 数据手册

Data Sheet

ADuM2210/ADuM2211

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.

POWER CONSUMPTION

The supply current at a given channel of the ADuM221x

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

_DDI= I_{DDI (Q)}

f ≤ 0.5f_r

f > 0.5f_r

_DDI= I_{DDI (D)}× (2f − f_r) + I_{DDI (Q)}

The preceding magnetic flux density values correspond to

specific current magnitudes at given distances away from the

ADuM221x transformers. Figure 15 expresses these allowable

current magnitudes as a function of frequency for selected

distances. As can be seen, the ADuM221x 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 ADuM221x to affect operation of the

component.

For each output channel, the supply current is given by

_DDO= I_{DDO (Q)}

f ≤ 0.5f_r

_DDO= (I_{DDO (D)}+ (0.5 × 10⁻³) × C_L× V_DDO) × (2f − f_r) + I_{DDO (Q)}

f > 0.5f_r

where:

_{DDI (D)}, I_{DDO (D)}are the input and output dynamic supply currents

per channel (mA/Mbps).

C_Lis the output load capacitance (pF).

_DDOis the output supply voltage (V).

1000

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

DISTANCE = 1m

rate, NRZ signaling).

f_ris the input stage refresh rate (Mbps).

100

_{DDI (Q)}, I_{DDO (Q)}are the specified input and output quiescent

supply currents (mA).

DISTANCE = 100mm

To calculate the total I_DD1and I_DD2, the supply currents for

each input and output channel corresponding to I_DD1and I_DD2

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 I_DD1and I_DD2

as a function of data rate for ADuM2210/ADuM2211 channel

configurations.

DISTANCE = 5mm

0.1

0.01

10k

100k

10M

100M

MAGNETIC FIELD FREQUENCY (Hz)

Figure 15. Maximum Allowable Current

for Various Current-to-ADuM221x Spacings

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.

Rev. A | Page 17 of 2

1...14 15 161718 19 20

中文翻译

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