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The magnetic signal coupling in the flip-chip SOIC16 package provides a high signal-to-noise ratio, but the high accuracy of the sensor throughout the operating temperature range is made possible by advanced semiconductor technologies. The Allegro current sensor IC employs BICMOS technology that provides excellent bipolar circuitry for designing low-noise, high-bandwidth amplifiers. The IC also employs high-density digital circuitry that provides the ability to accurately program the device sensitivity and zero current offset output voltage. All device programming is conducted at Allegro for ease of use in customer applications. Allegro factory programs the ACS710 to create multiple standard device offerings as outlined in the product datasheet on the Allegro website. The ACS710 analog output is designed to be linear to three times the nominal current range for sensing inrush currents in motor applications. The sensor has a bi-directional analog output which is labeled “VIOUT” in the block diagram in figure (A). When no current is flowing in the primary conductor, the output voltage will be a nominal value of VCC / 2 and will move in either a positive or negative direction depending on the direction of the current flowing in the primary leads, labeled IP+ and IP- in figure (A). The full scale output voltage depends on the programmed sensitivity of the device, and with a 5V supply, the ACS710-25C will be linear to greater than 75A. The performance of the 75A full scale current sensor variant, with a VCC of 5V, is illustrated in figure (B). BICMOS process technology allows Allegro to implement state-of-the-art, high speed chopper stabilized front-end amplifiers to minimize the noise and offset in the analog signal path. The end result of these Allegro patented circuits is a high accuracy device with excellent current measurement resolution. The ACS710 current sensor has a typical total error of ±2% over a 0°C to 125°C operating temperature range. Through proper filtering, the device can resolve currents well below 75mA.
