Avago: High Resolution 3-channel Optical Incremental Encoder Modules (AEDT-981X Series)

Description

Avago Technologies' AEDT-981x encoders are industrial grade high temperature (-40 to 115°C) rating three channel optical incremental encoder modules building on the Avago legacy HEDS-9140 series.

Using an Avago developed opto ASIC with the built-in Interpolator circuit, AEDT-981x encoders enable wide resolution range from 2000 to 5000 count per revolution with the rotary codewheel of 11mm optical radius, offering a high resolution yet compact solution.

With the opto-ASIC’s built-in automatic LED brightness regulation technique, the encoder current consumption can be significantly lowered (Typ. Icc: 20mA) while maintaining optimal encoder performance across spatial corners. This LED brightness control feature also enables optimal LED current control hence LED life can significantly prolonged.

With the state of the art opto-mechanical design, AEDT981x offers excellent spatial play of ∅ 0.40mm and code wheel gap range of ±150um. This allows great flexibility and ease of installation to the user.

Inheriting the indefeasible integrity in product robustness, repeatability and reliability, AEDT-981x series are designed for wide market employment withstanding wide application requirement and environment demand.

Features

Applications

The AEDT-981x 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 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.