CA-IS1305M25W

The CA‐IS1305x 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 digital output stage of CA‐IS1305x provides uncoded bit‐stream.

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‐IS1305x devices’ ultra‐low input voltage range (±250mV) allows the use of small sense resistor to reduce power dissipation and a very low, 0.3% gain error ensures measurement accuracy. This family of devices also features fail‐safe output to support high safety system design. The CA‐IS1305x devices specified for operation with 5MHz to 21MHz clock input. The internal sigma‐delta modulator combined with an external digital decimation sinc3 filter can achieve 85 dB signal‐to‐noise ratio (SNR) at 78.1 Ksps.

The CA‐IS1305x family is specified over the ‐40°C to +125°C operating temperature range and is available in 16‐pin SOIC wide body package.