Electronic Design

Go Modular With High-Resolution Encoders

A "one-size-fits-all" solution describes the AEDA-3200 series of three-channel, high-resolution, ultra-miniature incremental optical encoder modules. These plug-and-play modules meet the requirements of general-purpose housed encoders and integrated motor-encoder assemblies. Potential applications range from pick-and-place machines to automotive systems.

Developed by Agilent Technologies, the encoders measure 17 mm in diameter and 24 mm high, and resolutions range from 2500 to 20,000 counts/revolution. As a result, they can fulfill different customer needs by producing only one design for all resolutions. The alternative is to choose different encoder resolutions that fit into different mounting arrangements. The encoders' plug-and-play design eliminates inaccuracies caused by normal installation misalignment without the need for costly assembly fixtures.

An integrated RS-422 differential line driver permits signal lines up to 1200 meters. The modules operate from ­40°C to 125°C and are available in a top-down mounting (-T) version. A bottom-up mounting (-B) version with a height of only 12 mm will be available by the middle of next year.

The encoders employ a transmissive encoder technology to sense rotary position. Each module consists of an LED light source, a photodetector IC, an interpolator IC, a line driver with outputs consisting of two square waves in quadrature, and a gated index pulse.

The AEDA-3200-K (7500 counts/revolution), the first member of the series, costs $43 each in 5000-unit quantities. The -T and -B versions (2500 to 20,000 counts/revolution) are slated to arrive between the fourth quarter of this year and the first quarter of next year. Price is expected to be about $35 each (for 7500 counts/revolution) in 5000-unit lots.

Agilent Technologies Inc.
(800) 235-0312
See associated figure

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