High accuracy optically isolated delta-sigma modulator for industrial automation applications

Article By : Renesas Electronics

High precision rv1s9353a provides current sensing and voltage monitoring, and directly connects to MPUs, MCUs, SoCs AND FPGAs with a digital filter...

Renesas Electronics announced the RV1S9353A optically isolated delta-sigma (ΔΣ) modulator. The RV1S9353A delivers the industry’s highest accuracy compared to other 10MHz clock output optically isolated devices. It includes a precision analog-to-digital converter with ENOB of 13.8 bits (typ) for converting an analog 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 meets this need with best-in-class 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 want to standardize 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. Best of all, the ΔΣ modulator’s digital output and connected digital filter removes the need for complex multi-component designs that use a traditional analog isolation amplifier with analog filter and several other components.

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