CA-IS1306M25W

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Isolated Modulator

The CA‐IS1306x family of devices is series of precision isolated sigma‐delta (Σ‐Δ) modulator and optimized for shunt resistor‐based current sensing or other small signal measurement applications. The input current‐sense amplifier monitors current flow through a shunt (sense) resistor and the sigma‐delta modulator converts the analog input to a digital bit stream of 1's and 0's at a much higher frequency.

The analog input‐side (high‐side) and digital output‐side(low‐side) are separated by unique silicon oxide (SiO2) capacitive isolation barriers that provide up to 5kVRMS galvanic isolation per UL1577 certification, and isolator drivers transfer the output of the modulator across this isolation barrier. In systems with different voltage domains, this isolation technical is typically used to protect the low voltage side from the high voltage side in case of any faults. These devices also feature up to 150kV/μs common mode transient immunity and enable efficient bit‐stream transmission in noisy environments.

The CA‐IS1306x devices'ultra‐low input voltage range (±250mV) allows the use of small sense resistor to reduce power dissipation and a very low, 0.2% gain error ensures measurement accuracy. This family of devices also features fail‐safe output to support high safety system design. The CA‐IS1306x devices specified for operation with 5MHz to 21MHz clock input. The internal sigma‐delta modulator combined with an external digital decimation sinc3filter can achieve 85 dB signal‐to‐noise ratio (SNR) at 78.1 Ksps.

The CA‐IS1306x family is specified over the ‐40°C to +125°C operating temperature range and is available in 8‐pin SOIC wide body package.

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  • Features

    Full‐Scale Sense Voltage Range

    ±250 mV

    Uncoded Bitstream Output

    Ultra‐Low Input Offset Voltage and Gain Error

    ±100 µV (max) at 25°C input offset voltage
    ±0.2% (max) at 25°C gain error

    Low Drift

    ±3.5 μV/°C (max) input offset tempco
    ±40 ppm/°C (max) gain drift

    Excellent AC Performance

    SNR: 85dB (typ)
    THD: ‐93dB (typ)

    16‐Bit Resolution with No Missing Codes

    Wide Power Supply Operating Range

    3.3V to 5.5V supply range for both high‐side and low‐side

    Robust Isolation Barrier

    High lifetime: >40 years
    Up to 5000 VRMS isolation rating
    ±150 kV/μs typical CMTI

    Fault Diagnostic Functions Improve System Safety

    Wide Operating Temperature Range

    –40°C to 125°C

  • Applications

    • Industrial Motor Controls and Drives

    • Isolated Power Supplies

    • Process Signal Isolation

  • Device Information

    Part numberPackagePackage size (NOM)
    CA‐IS1306x
    CA‐IS1306AMx
    CA‐IS1306M25W
    SOIC8‐WB (G)5.85 mm × 7.50 mm
    SOIC16‐WB (W)10.3 mm × 7.50 mm
    SOIC16‐WB (W)10.3 mm × 7.50 mm
  • Simplified Functional Diagram

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