Mixed Signal/Analog

Digital isolators have integrated dc-to-dc converter

29th March 2022
Mick Elliott

The DuM642xA family from Analog Devices are quad-channel digital isolators with an isoPower, integrated, isolated dc-to-dc converter.

They are in stock at distributor Anglia Components.

This family of quad-channel isolators eliminate the need for a separate, isolated dc-to-dc converter in 500 mW, isolated designs, reducing design complexity and cost. Analog Devices iCoupler chip scale transformer technology is used for isolated logic signals and for the magnetic components of the dc-to-dc converter. The result is a small form factor, total isolation solution.

All devices in the family include the same isolated dc-to-dc converter and are differentiated by directional digital channel configurations. The devices are available with popular 5V and 3.3V voltage and associated output current levels as listed in the table below.

Based on the Analog Devices iCoupler technology, the integrated dc-to-dc converter provides regulated, isolated power that meets CISPR 32/EN 55032 Class B limits at a full load on a 2-layer printed circuit board (PCB) with ferrites.

The ADuM642xA family of isolators provide four independent isolation channels specified from DC to 100Mbps and have high common-mode transient immunity of 100kV/µs. The devices are available in 28 lead SOIC package and have a specified operating temperature range from -40°C to +125C

The isolators are supported by the EVAL-ADUM6421ARNZ (pictured) and EVAL-ADUM6421AURNZ evaluation boards.

The EVAL-ADUM6421ARNZ includes the ADuM6421ABRNZ5quad-channel digital isolator with integrated, isolated dc-to-dc converter.

Alternatively, the EVAL-ADUM6421AURNZ leaves the isolator position unpopulated to support evaluation of the ADuM6420A, ADuM6421A, ADuM6422A, ADuM6423A, or ADuM6424A.

Full specifications for the ADuM642xA family is available in the data sheet, which must be consulted in conjunction with the user guide when using the evaluation boards.

The ADuM642xA family of devices can provide regulated, isolated power that meets CISPR 32/EN 55032, Class B limits at full load on a 2-layer printed circuit board (PCB) with ferrite beads, the evaluation boards have been designed to fully demonstrate this capability.

The radiated emissions test plots for the evaluation boards are provided in Figure 4 and Figure 5 of the data sheet.

The isolators are ideal for a wide range of applications including RS-232 transceivers, Power supply start-up bias and gate drives, Isolated sensor interfaces, Automotive on-board charger (OBC) and Industrial programmable logic controllers (PLCs).

Anglia are offering customers a FREE evaluation board and samples of the ADuM642xA quad-channel isolators with integrated dc-to-dc converter from Analog Devices.

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