High Accuracy Optically Isolated Modulator for Industrial Automation

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  • Renesas Electronics’ delta-sigma (ΔΣ) modulator comes with better voltage monitoring and current sensing capabilities
  • Optimal for smart factory applications including automated robot controllers

There has been a huge demand for high-accuracy optical isolation instruments thanks to improved control accuracy.

With this in mind, Renesas Electronics Corporation has launched the RV1S9353A, an optically isolated delta-sigma (ΔΣ) modulator that can deliver high accuracy compared to other 10MHz clock output optically isolated devices, thus meeting the growing needs 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.  It includes a precision analogue-to-digital converter with ENOB of 13.8 bits (typical) for converting an analogue voltage input into a digital output one-bit data stream across the isolation barrier.

Built for modern day factories

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 can be used in robotic arm controllers, as well as AC servo controllers and NC servo controllers equipment deployed in smart factories.

The device has a low offset voltage drift that simplifies offset correction. Its 5kV RMS isolation and 8mm creepage distance are 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. The ΔΣ modulator’s digital output and connected digital filter remove 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 our customers 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.”

Key Features of the RV1S9353A ΔΣ Modulator

  • Input offset voltage drift vs temperature (max) 2.5µV/°C
  • SNR (typical) 85dB
  • Reference voltage (max) gain error ±0.5%
  • Reference voltage drift vs. temperature (typical) 30ppm/°C
  • High input resistance (typical) 500kΩ
  • High common-mode transient immunity (typical) 25kV/us
  • Operating ambient temperature (max) -40°C to 110°C
  • Supplied in 8-pin SDIP with 1.27mm pin pitch

The new RV1S9353A ΔΣ modulator joins Renesas’ family of optoelectronic products, including photocouplers with IC output and high-speed communication up to 15Mbps, as well as general-purpose transistor output devices featuring high isolation voltage, high-temperature operation and compliance with various international safety standards. The motor driving photocouplers (IPM drive and IGBT drive) feature high isolation voltage, high-temperature operation, high output current, and high-speed switching.

The RV1S9353A ΔΣ modulator is available now from Renesas’ worldwide distributors.


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