Avago: High Resolution 2- and 3-channel Housed Encoder Module Kits with Connector Latch (AEDC-55xx/AEDC-56xx)

Description

The AEDC-5xxx series encoders, while similar to the industry standard HEDS-5xxx series kit encoder, provides a connector latch on the cover housing to improve connector retention. This device is built upon the Avago AEDT-9810 series encoder module, and provides the same performance, low cost, high reliability, high resolution, and ease of assembly customers have come to expect.

Each encoder contains a LED source with lens, an ASIC with integrated photo detector arrays, LED current regulation, interpolator and output driver circuitry, and a code wheel which rotates between the emitter and detector ASIC. The outputs of the AEDC-5xxx are two square waves in quadrature. In addition, a third channel offers index signal, which is a 90 electrical degree, true index pulse which is generated once for each full rotation of the code wheel. The AEDC-5xxx series utilizes a film code wheel allowing for resolutions up to 5000 CPR and accommodating shaft diameters from 2mm to 8mm.

This kit encoder may be quickly and easily mounted to a motor. The electrical interface is through five (single ended) or ten (differential versions) 0.025 inch square pins on 0.100 inch centers. Interface cable assemblies to meet customer requirements are available also.

The differential (line driver) version offers enhanced performance when the encoder is used in noisy environments, or when it is required to drive long cables. It uses an industry standard RS422 compatible line driver IC, AEIC-7272, which provides differential outputs for each of the encoder channels. Suggested line receivers are 26LS32 and 26LS33.

Features

Applications

The AEDC-5xxx is suitable for a wide range of commercial & industrial motion control applications including, but not limited to:

Transmissive Encoders

The Transmissive Encoder is an emitter/detector module. Coupled with a code wheel, this transmissive encoder translates rotary motion of a shaft into digital output. The transmissive encoder contains a single Light Emitting Diode (LED) as its light source. The light is collimated into a parallel beam by means of a single polycarbonate lens located directly over the LED. Opposite the emitter is the integrated detector circuit.

This IC consists of multiple sets of photodetectors and the signal processing circuitry necessary to produce the digital waveforms. The code wheel rotates between the emitter and detector of the transmissive encoder, causing the light beam to be interrupted by the pattern of spaces and bars on the code wheel. The photodiodes which detects these interruptions are arranged in a pattern that corresponds to the radius and design of the code wheel. These detectors are also spaced such that a light period on one pair of detectors corresponds to a dark period on the adjacent pair of detectors. Avago offers an extensive range of transmissive encoders to meet the different needs of a wide variety of applications.