1 kV RMS Six-Channel Digital Isolators

Data Sheet

ADuM7640/ADuM7641/ADuM7642/ADuM7643

Rev. 0

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FEATURES

Small 20-lead QSOP

1000 V rms isolation rating

Safety and regulatory approvals (pending):

UL recognition (pending)

1000 V rms for 1 minute per UL 1577

Low power operation

3.3 V operation

1.6 mA per channel maximum at 0 Mbps to 1 Mbps

7.8 mA per channel maximum at 25 Mbps

5 V operation

2.2 mA per channel maximum at 0 Mbps to 1 Mbps

11.2 mA per channel maximum at 25 Mbps

Bidirectional communication

Up to 25 Mbps data rate (NRZ)

3 V/5 V level translation

High temperature operation: 105°C

High common-mode transient immunity: >15 kV/μs

APPLICATIONS

General-purpose, multichannel isolation

SPI interface/data converter isolation

RS-232/RS-422/RS-485 transceivers

Industrial field bus isolation

GENERAL DESCRIPTION

The ADuM7640/ADuM7641/ADuM7642/ADuM76431 are

6-channel digital isolators based on the Analog Devices, Inc.,

i

Coupler® technology. These 1 kV digital isolation devices are

packaged in a small 20-lead QSOP. They offer space savings and

a lower price than 2.5 kV or 5 kV isolation solutions when only

functional isolation is needed.

This family, like many Analog Devices isolators, offers very low

power consumption, using one-tenth to one-sixth the power of

other digital isolators, with the supply voltage on either side

ranging from 3.0 V to 5.5 V. Despite their low power consumption,

the ADuM7640/ADuM7641/ADuM7642/ADuM7643 provide

low pulse width distortion (< 6 ns for C grade) and a channel-

by-channel glitch filter to protect the device against extraneous

noise disturbances. Four channel direction combinations are

available with a maximum data rate of 1 Mbps or 25 Mbps. All

products have a default output high logic state in the absence of

input power.

FUNCTIONAL BLOCK DIAGRAMS

1

20

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19

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18

ENCODE

DECODE

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17

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DECODE

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16

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15

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14

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13

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12

ENCODE

DECODE

10

11

ADuM7640

Figure 1. ADuM7640

1

20

2

19

3

18

ENCODE

DECODE

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17

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DECODE

5

16

ENCODE

DECODE

6

15

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DECODE

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14

8

13

DECODE

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12

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10

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ADuM7641

Figure 2. ADuM7641

1

20

2

19

3

18

ENCODE

DECODE

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17

ENCODE

DECODE

5

16

ENCODE

DECODE

6

15

DECODE

ENCODE

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14

8

13

DECODE

ENCODE

9

12

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DECODE

10

11

ADuM7642

Figure 3. ADuM7642

1

20

2

19

3

18

ENCODE

DECODE

4

17

ENCODE

DECODE

5

16

DECODE

ENCODE

6

15

DECODE

ENCODE

7

14

8

13

DECODE

ENCODE

9

12

ENCODE

DECODE

10

11

ADuM7643

Figure 4. ADuM7643