If you need to control a DC motor with encoder feedback, this chip will fit the bill nicely.
T here are many methods for controlling motors.
You can use stepper motors, DC motors that use PWM and encoders for feedback, or a complete precision motion control system that uses an LM628 motion-control chip. These systems require a lot of work building and programming microprocessors to get the motor started. Recently, JR Kerr introduced a new product that is helpful for controlling a DC motor with encoder feedback. The system is implemented as a two-chip set. One chip is used as a 16-bit quadrature encoder counter.