Many encoders have open-collector outputs, which can simplify interfacing with other devices, particularly if voltage-level shifting is required. In addition, the choice of output circuit topology influences aspects of system performance such as power consumption, speed range and noise immunity. The resolution required, as well as dimensions and mounting type, also need to be considered.
To choose the optimum device for a given application, engineers must decide between absolute, incremental or commutation encoders, which present data in various formats such as quadrature, motor-pole or a serial protocol. Position encoders are widely used in motion control applications and many different types are available.
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