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Renesas unveils industry’s highest accuracy optically isolated delta-sigma modulator

By Michelle Froese

Renesas Electronics Corporation, a supplier of advanced semiconductor solutions, has launched 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.

“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.”

Features

  • Input offset voltage drift vs temperature (max) 2.5µV/°C
  • SNR (typ) 85dB
  • Reference voltage (max) gain error ±0.5%
  • Reference voltage drift vs. temperature (typ) 30ppm/°C
  • High input resistance (typ.) 500kΩ
  • High common mode transient immunity (typ) 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) also feature high-isolation voltage, high-temperature operation, high-output current, and high-speed switching.

 


Filed Under: Components
Tagged With: renesaselectronics
 

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