Avago has announced an optically isolated sigma-delta modulator that uses an external clock to provide direct measurement of motor phase currents in power inverters.
Based on an advanced low-power CMOS process, the ACPL-796J uses an external clock that allows synchronised data conversion between the current sensor and controller to help motor control designers eliminate complex design processes in data and clock reading. Moreover, the device is designed with digital inputs and outputs that are compatible with systems powered by 5 V or 3 V supplies and works over a wide industrial temperature range.
Combined with enhanced optical coupling technology, the modulator delivers high noise margins and excellent immunity against isolation-mode transients. With 0,5 mm minimum distance through insulation, the ACPL-796J provides reliable double protection and high working insulation voltage, which is suitable for fail-safe designs. Offered in a 16-lead small outline package, the isolated A-D converter delivers the reliability, small size, isolation and over-temperature performance that motor drive designers need to accurately measure current at a lower price than traditional current transducers.
The device has 16-bit resolution (12-bit effective) and an external clock input range of 5–20 MHz. It features a 1-bit, second order sigma-delta modulator and a minimum signal-to-noise ratio of 74 dB. Maximum offset drift is 3,5 μV/°C, maximum gain error is ±1% and common-mode transient immunity is 25 kV/μs. The IC features a linear range of ±200 mV with a single 5 V supply (±320 mV full scale) and operates from 3 to 5,5 V supply range.
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