ADUM3400BRWZ【PDF 20/24 页】IC DIGITAL ISOLATOR 4CH 16-SOIC

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ADuM3400/ADuM3401/ADuM3402

APPLICATION INFORMATION

PC BOARD LAYOUT

The ADuM340x digital isolator requires no external interface

circuitry for the logic interfaces. Power supply bypassing is

strongly recommended at the input and output supply pins (see

Figure 17). Bypass capacitors are most conveniently connected

between Pin 1 and Pin 2 for V DD1 and between Pin 15 and

Pin 16 for V DD2 . 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. Bypassing between Pin 1 and Pin 8 and between Pin 9

and Pin 16 should also be considered unless the ground pair on

Data Sheet

While the ADuM340x improve system-level ESD reliability,

they are no substitute for a robust system-level design. See the

AN-793 Application Note, ESD/Latch-Up Considerations with

iCoupler Isolation Products for detailed recommendations on

board layout and system-level design.

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.

each package side is connected close to the package.

INPUT (V Ix )

50%

V DD1

GND 1

V IA

V IB

V IC/OC

V DD2

GND 2

V OA

V OB

V OC/IC

OUTPUT (V Ox )

t PLH

t PHL

50%

V ID/OD

V E1

V OD/ID

V E2

Figure 18. Propagation Delay Parameters

GND 1 GND 2

Figure 17. Recommended Printed Circuit Board Layout

In applications involving high common-mode transients, care

should be taken to ensure that board coupling across the isolation

barrier is minimized. Furthermore, the board layout should be

designed such that any coupling that does occur equally affects

all pins on a given component side. Failure to ensure this could

cause voltage differentials between pins exceeding the Absolute

Maximum Ratings of the device, thereby leading to latch-up or

permanent damage.

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

SYSTEM-LEVEL ESD CONSIDERATIONS AND

ENHANCEMENTS

System-level ESD reliability (for example, per IEC 61000-4-x) is

highly dependent on system design, which varies widely by

application. The ADuM340x incorporate many enhancements

to make ESD reliability less dependent on system design. The

enhancements include:

Pulse width distortion is the maximum difference between

these 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

the propagation delay differs between channels within a single

ADuM340x component.

Propagation delay skew refers to the maximum amount the

propagation delay differs between multiple ADuM340x

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

of refresh pulses indicative of the correct input state are sent to

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

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

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ESD protection cells added to all input/output interfaces.

Key metal trace resistances reduced using wider geometry

and paralleling of lines with vias.

The SCR effect inherent in CMOS devices minimized by

use of guarding and isolation technique between PMOS

and NMOS devices.

Areas of high electric field concentration eliminated using

45° corners on metal traces.

Supply pin overvoltage prevented with larger ESD clamps

assumed to be unpowered or nonfunctional, in which case the

isolator output is forced to a default state (see Table 11) by the

watchdog timer circuit.

The limitation on the magnetic field immunity of the ADuM340x

is set by the condition in which induced voltage in the receiving

coil of the transformer 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 condition of the

ADuM340x is examined because it represents the most

susceptible mode of operation.

between each supply pin and its respective ground.

Rev. C | Page 20 of 24

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