ADUM1210BRZ【PDF 14/20 页】IC ISOLATOR DIGITAL DUAL 8SOIC

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ADuM1210

APPLICATIONS INFORMATION

PC BOARD LAYOUT

The ADuM1210 digital isolator requires no external interface

circuitry for the logic interfaces. Power supply bypassing is

strongly recommended at the input and output supply pins. The

capacitor value should be between 0.01 μF and 0.1 μF. The total

lead length between both ends of the capacitor and the input

power supply pin should not exceed 20 mm.

See the AN-1109 Application Note for board layout guidelines.

PROPAGATION DELAY-RELATED PARAMETERS

Propagation delay is a parameter that describes the time it takes

a logic signal to propagate through a component. The propagation

delay to a logic low output can differ from the propagation

delay to a logic high output.

Data Sheet

The pulses at the transformer output have an amplitude greater

than 1.0 V. The decoder has a sensing threshold at about 0.5 V,

therefore establishing a 0.5 V margin in which induced voltages

can be tolerated. The voltage induced across the receiving coil is

given by

V = ( ?dβ/dt ) ∑ π r n2 ; n = 1, 2, … , N

where:

β is the magnetic flux density (gauss).

r n is the radius of the nth turn in the receiving coil (cm).

N is the number of turns in the receiving coil.

Given the geometry of the receiving coil in the ADuM1210 and

an imposed requirement that the induced voltage be at most

50% of the 0.5 V margin at the decoder, a maximum allowable

magnetic field is calculated, as shown in Figure 10.

INPUT (V Ix )

OUTPUT (V Ox )

t PLH

t PHL

50%

50%

100

10

Figure 9. Propagation Delay Parameters

1

Pulse width distortion is the maximum difference between the

two propagation delay values and is an indication of how

accurately the input signal’s timing is preserved.

Channel-to-channel matching refers to the maximum amount

that the propagation delay differs between channels within a

single ADuM1210 component.

0.1

0.01

Propagation delay skew refers to the maximum amount that

0.001

1k

10k

100k

1M

10M

100M

the propagation delay differs between multiple ADuM120x

components operating under the same conditions.

DC CORRECTNESS AND MAGNETIC FIELD IMMUNITY

Positive and negative logic transitions at the isolator input cause

narrow (~1 ns) pulses to be sent to the decoder via the transformer.

The decoder is bistable and is therefore either set or reset by the

pulses, indicating input logic transitions. In the absence of logic

transitions of more than ~1 μs at the input, a periodic set of

refresh pulses indicative of the correct input state is sent to

ensure dc correctness at the output. If the decoder receives no

internal pulses for more than about 5 μs, the input side is

assumed to be unpowered or nonfunctional, in which case the

isolator output is forced to a default state (see Table 12) by the

watchdog timer circuit.

The ADuM1210 is extremely immune to external magnetic

fields. The limitation on the ADuM1210 magnetic field

immunity is set by the condition in which induced voltage in

the transformer’s receiving coil is sufficiently large to either

falsely set or reset the decoder. The following analysis defines

the conditions under which this can occur. The 3 V operating

MAGNETIC FIELD FREQUENCY (Hz)

Figure 10. Maximum Allowable External Magnetic Flux Density

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 occurred during a transmitted pulse

(and had 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

ADuM1210 transformers. Figure 11 expresses these allowable

current magnitudes as a function of frequency for selected

distances. As seen in Figure 11, the ADuM1210 is extremely

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, a 0.5 kA current would have to be

placed 5 mm away from the ADuM1210 to affect the

component’s operation.

condition of the ADuM1210 is examined because it represents

the most susceptible mode of operation.

Rev. D | Page 14 of 20

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