Renesas unveils Delta-Sigma Modulator for industrial automation applications

03 August 2020

Renesas has unveiled the RV1S9353A, an optically isolated delta-sigma (ΔΣ) modulator for industrial automation applications.

According to Renesas, the RV1S9353A delivers the industry’s highest accuracy compared to other 10MHz clock output optically isolated devices. It includes a precision analogue-to-digital converter with ENOB of 13.8 bits (typ) for converting an analogue voltage input into a digital output one-bit data stream across the isolation barrier.

The RV1S9353A connects directly to an RZ/T MPU and RX72M MCU or other MPUs, MCUs, SoCs and FPGAs with a digital filter. The RV1S9353A is used in robotic arm controllers, as well as AC servo controllers and NC servo controllers employed in a range of smart factory equipment.

The trend toward improving control accuracy for industrial instruments is driving the demand for high-accuracy optical isolation. Renesas’ RV1S9353A provides precision sensing features, including lower offset voltage drift, higher signal-to-noise ratio (SNR), lower reference voltage drift vs. temperature, and higher input resistance. The modulator’s low offset voltage drift simplifies offset correction and its 5kV rms isolation and 8mm creepage distance is ideal for compact 200V and 400V motor drive equipment.

OEMs are increasingly wanting to standardise their designs during development and design certification. The RV1S9353A addresses this requirement with 500kΩ typical input resistance making it capable of both current sensing and voltage monitoring for easier design. The ΔΣ modulator’s digital output and connected digital filter also removes the need for complex multi-component designs that use a traditional analogue isolation amplifier with analogue filter and several other components.

“The RV1S9353A ΔΣ modulator gives the absolute highest accuracy and control needed to modernize today’s smart factories,” said Chris Stephens, Vice President of Communications & Motor Control, Industrial and Communications Business Division at Renesas. “Its higher input resistance and ability to provide both current sensing and voltage monitoring simplifies design and saves costs while meeting the UL, CSA and VDE safety standards.”

Author
Neil Tyler