UG-400 Datasheet, PDF (12/20 Pages) Analog Devices – Plug and play system evaluation

UG-400
ISOLATED LVDS
The isolated LVDS port is implemented using the ADuM3442
iCoupler signal isolator, the ADN4664 dual LVDS receiver, the
ADN4663 dual LVDS transmitter, and the ADuM5000 isoPower
isolated dc-to-dc converter. The ADuM3442 is connected to
SPORT2 of the ADSP-BF548. Figure 10 shows a circuit diagram
of the implementation of the isolated LVDS using the ADuM3442,
ADN4663, ADN4664, and ADuM5000 on the ezLINX hardware.
The VDD1 pin (Pin 1) of the ADuM3442 and the VDD1 pin (Pin 1 and
Pin 7) of the ADuM5000 are powered by 3.3 V. The ADuM5000
generates an isolated 3.3 V, which is used to supply power to the
Hardware User Guide
VDD2 pin (Pin 16) of the ADuM3442, the VCC pin (Pin 1) of the
ADN4663, and the VCC pin (Pin 8) of the ADN4664.
A 32-pin header connector is used for easy access to the isolated
LVDS signals.
The ADuM5000 contains isoPower technology that uses high
frequency switching elements to transfer power through the
transformer. Special care must be taken during PCB layout to
meet emissions standards. See the AN-0971 Application Note,
Recommendations for Control of Radiated Emissions with
isoPower Devices, for board layout recommendations.
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