SLLSFP4 July 2022 ISOW7721
PRODUCTION DATA
The ISOW7721 uses emissions reduction schemes for the internal oscillator and advanced internal layout scheme to minimize radiated emissions at the system level.
Many applications in harsh industrial environment are sensitive to disturbances such as electrostatic discharge (ESD), electrical fast transient (EFT), surge and electromagnetic emissions. These electromagnetic disturbances are regulated by international standards such as IEC 61000-4-x and CISPR 32. Although system-level performance and reliability depends, to a large extent, on the application board design and layout, the ISOW7721 incorporates many chip-level design improvements for overall system robustness. Some of these improvements include:
Power path and signal path separated to minimize internal high frequency coupling and an external filtering knob using ferrite beads available to further reduce emissions
Reduced power converter switching frequency to 25 MHz to reduce strength of high frequency components in emissions spectrum