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GENERAL DESCRIPTION

The ADuM1240/ADuM1241/ADuM1245/ADuM12461 are

micropower, 2-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.

The 20-lead SSOP version of the ADuM1240/ADuM1241/

ADuM1245/ADuM1246 allows control of the internal refresh

functions. As shown in Figure 3, in standard operating mode,

when ENx = 0 (internal refresh enabled), the current per channel is

less than 10 μA. When ENx = 1 (internal refresh disabled), the current per

channel drops to less than 1 μA.

The ADuM1240/ADuM1241/ADuM1245/ADuM1246 are

packaged in either a 20-lead SSOP for 3.75 kV reinforced

isolation or an 8-lead SOIC for 3 kV basic isolation. The devices

meet regulatory requirements, such as UL and CSA standards.

In addition to the space saving package options, the ADuM1240/

ADuM1241/ADuM1245/ADuM1246 operate with supplies as

low as 2.25 V. All models provide low, pulse width distortion at

<8 ns. In addition, every model has an input glitch filter to

protect against extraneous noise disturbances.

FEATURES

Ultralow power operation

3.3 V operation

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

3.1 μA per channel quiescent current, refresh enabled

0.1 μA per channel quiescent current, refresh disabled

116 μA/Mbps per channel typical dynamic current

Small, 20-lead SSOP package and small 8-lead SOIC package

Bidirectional communication

Up to 2 Mbps data rate nonreturn to zero (NRZ)

High temperature operation: 125°C

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

Safety and Regulatory Approvals

UL 1577 component recognition program

3750 V rms for 1 minute per UL 1577 (20-lead SSOP)

3000 V rms for 1 minute per UL 1577 (8-lead SOIC)

CSA Component Acceptance Notice 5A

VDE certificate of conformity

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

VIORM = 849 V peak (20-lead SSOP)

VIORM = 560 V peak (8-lead SOIC)

APPLICATIONS

General-purpose, low power, multichannel isolation

1 MHz low power serial peripheral interface (SPI)

4 mA to 20 mA loop process control