The MC33039DR2G is a high-performance closed-loop speed control adapter specifically designed for use in brushless DC motor control systems, allowing for precise speed regulation without a tachometer. This device features TTL-compatible inputs with hysteresis, digital detection of each input transition, and an internal shunt regulator that supports operation from a non-regulated voltage source. It operates over an ambient temperature range of -40°C to +85°C. Primarily intended for use with the MC33035 brushless motor controller, its features, including an inverter output for sensor phasing conversion, make it cost-effective for a wide range of closed-loop speed control applications.