Micropower

Quad-Channel Digital Isolators

Data Sheet

ADuM1440/ADuM1441/ADuM1442/ADuM1445/ADuM1446/ADuM1447

FEATURES

Ultralow power operation

3.3 V operation (typical)

5.6 µA per channel quiescent current, refresh enabled

0.3 µA per channel quiescent current, refresh disabled

148 µA/Mbps per channel typical dynamic current

2.5 V operation (typical)

3.1 µA per channel quiescent current, refresh enabled

0.1 µA per channel quiescent current, refresh disabled

117 µA/Mbps per channel typical dynamic current

Small, 16-lead QSOP

Bidirectional communication

Up to 2 Mbps data rate (NRZ)

High temperature operation: 125°C

High common-mode transient immunity: >25 kV/µs

Safety and regulatory approvals

UL 1577 Component Recognition Program (pending)

2500 V rms for 1 minute per UL 1577

CSA Component Acceptance Notice #5A (pending)

VDE Certificate of Conformity (pending)

DIN V VDE V 0884-10 (VDE V 0884-10):2006-12

APPLICATIONS

General-purpose, low power multichannel isolation

1 MHz, low power peripheral interface (SPI)

4 mA to 20 mA loop process controls

GENERAL DESCRIPTION

The ADuM1440/ADuM1441/ADuM1442/ADuM1445/

ADuM1446/ADuM14471 are micropower, 4-channel digital

isolators based on the Analog Devices, Inc., iCoupler® technology.

Combining high speed, complementary metal oxide semiconductor

(CMOS) and monolithic air core transformer technologies,

these isolation components provide outstanding performance

characteristics superior to the alternatives, such as optocoupler

devices. As shown in Figure 2, in standard operating mode,

current per channel drops to less than 1 µA.

FUNCTIONAL BLOCK DIAGRAM

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ADuM144x

QSOP

Figure 1.

The ADuM1440/ADuM1441/ADuM1442/ADuM1445/

ADuM1446/ADuM1447 family of quad 2.5 kV digital isolation

devices are packaged in a small 16-lead QSOP, freeing almost

70% of board space compared to isolators packages in wide

body SOIC packages. The devices withstand high isolation

voltages and meet regulatory requirements, such as UL and

CSA standards (pending). In addition to the space savings, the

ADuM1440/ADuM1441/ADuM1442/ADuM1445/ADuM1446/

ADuM1447 operate with supplies as low as 2.25 V.

Despite the low power consumption, all models of the ADuM1440/

ADuM1441/ADuM1442/ADuM1445/ADuM1446/ADuM1447

provide low, pulse width distortion at <8 ns. In addition, every

model has an input glitch filter to protect against extraneous

noise disturbances.

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DATA RATE (Mbps)

1

Protected by U.S. Patents 5,952,849, 6,873,065, 7,075,329, 6,262,600. Other patents pending.

Rev. 0

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