AEDx-8xxx-xxx Series

(2- or 3-Channel Incremental Encoder Kit with Codewheel)

Description

The AEDx-8xxx comes in an option of two-channel or three-channel optical incremental encoder kit with codewheel integrated in a protective housing. The encoder is lead free and compliant to the RoHS directive. Each encoder kit consists of a collimated LED source and a detector IC enclosed within a small plastic package.

The AEDx-8xxx optical encoder has two-channel quadrature outputs (A,B) plus a third channel index output (I). There are three index options available. i.e. ungated, gated-90 ° and gated-180 ° electrical degree index pulse.

The AEDx-8xxx series optical encoder is designed for use with motors with shaft diameters of 2mm and up to 5mm. The quadrature, index and power supplied to the encoder are accessed through an 8-pin male connector of 1.25 mm pitch.

The AEDx-8xxx solution enables the servo system to be more compact. With the aid of alignment jig, the assembly process will also require less alignment time, thus making the assembly process much easier for servo motor integration.

Applications

The AEDx-8xxx provides motion detection for DC servo motor and closed loop stepper motor feedback system in the following applications:

• Pick and Place machines

• Semiconductor equipment

• Factory automation equipment

Features

• 3-channel differential output (A,B) with ungated, gated-90 ° and gated-180 ° index pulse (I)

• 2-channel differential output available

• Up to 500 Cycles Per Revolution (CPR)

• Up to 30000 rpm motor speed

• -40 °C to 100 °C operating temperature

• Single 5 V supply

• Integrated RS-422 line driver

• Quick and easy assembly

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 codewheel. 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.