CA-IS1311BG

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Isolated Amplifier for Voltage Sensing

The CA-IS1311 devices are high-precision reinforced isolated amplifiers and optimized for voltage sensing. Low offset and gain error and drift guarantee that measuring accuracy is maintained over the entire operating temperature range.

The CA-IS1311 devices utilize silicon oxide (SiO2) isolation barriers and support up to 5-kVRMS galvanic isolation per UL 1577. This technology separates high- and low-voltage domain to protect lower-voltage parts from damage and provides low emissions as well as strong anti-interference capability from magnetic changes. The high common-mode transient immunity (CMTI) means that the CA-IS1311 devices transmit correct signals through isolation barriers and are suitable for industrial motor controls and drives which require high-voltage and high-power switching. The internal missing or undervoltage lockout (UVLO) of highside supply voltage detection functions contribute to fault diagnostics and system safety.

The input of CA-IS1311 is high-impedance, making it suitable for applications where the measured signal sources have high output resistance (such as high-voltage resistive dividers). The CA-IS1311 devices have shutdown mode, which could shut down the high-side circuit by pulling up SHTDN pin to save power.

The CA-IS1311 devices are packaged in wide body, 8-pin SOIC packages and specified over the extended industrial temperature range of –40°C to 125°C.

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  • Features

    Input Voltage Range

    –0.1 V to 2 V

    High Input Impedance

    1 GΩ (typ)

    Fixed Initial Gain

    1

    Low Input Offset and Drift

    ±1.5 mV (max) at 25°C, ±15 μV/°C (max)

    Low Gain Error and Drift

    ±0.3% (max) at 25°C, ±40 ppm/°C (max)

    3.3-V or 5-V Operation for Both High- and Low-Side

    Wide Operating Temperature Range

    –40°C to 125°C

    High CMTI

    ±150 kV/µs (typ, CA-IS1311BG)

    Safety-Related Certifications

    7-kVPK Isolation per DIN EN IEC 60747-17 (VDE 0884-17)
    5-kVRMS Isolation for 1 Minute per UL 1577
    TUV Certification Approvals

    >40-year Life at Rated Working Voltage

  • Applications

    • Industrial Motor Controls and Drives

    • Isolated Switch Mode Supplies

    • Uninterruptible Power Supplies

  • Device Information

    PART NUMBERPACKAGEBODY SIZE (NOM)

    CA-IS1311G

    CA-IS1311BG

    SOIC8-WB (G)5.85 mm × 7.50 mm
  • Simplified Functional Diagram

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