Power Electronics

Motor Encoding Systems with Industry's First Three-Channel Reflective Encoders

Avago Technologies announced the market's first three-channel reflective encoder. The new AEDR-850x encoders feature built-in interpolation for high-resolution measurement that is ideal for a wide range of applications, including closed-loop stepper motors, miniature motors, printers, copiers, card readers, insulin pumps and other types of industrial, consumer and medical equipment.

A standard reflective encoder module contains two digital output channels for direction sensing, with another module required for indexing purposes. For motion feedback applications requiring high-resolution measurement, an external interpolation device had previously been necessary. The Avago AEDR-850x reflective encoders integrate an LED light source, photodetecting and interpolator circuitry, and the three channels in a single package with a 3.95-mm-by-3.40-mm footprint. With high resolution encoding of 304 lines per inch (12 lines per mm), the compact, highly-integrated modules enable a new level of miniaturization for applications where size and space are primary concerns.

The AEDR-850x encoders offer interpolation of up to 4X and enable various resolution designs by changing the codewheel size. The optical-based modules are significantly less susceptible to EMI compared with Hall Effect devices. With an absolute operating temperature range of -20° C to 85° C, the rugged encoders are suitable for commercial and industrial operation environments.

Small surface mount leadless package measuring 3.95 mm by 3.40 mm by 0.95 mm. The Avago AEDR-8500 reflective encoder is gated 90º, the AEDR-8501 encoder is gated 180º and the AEDR-8502 encoder is ungated 360º. The encoders are priced at $6.75 each in 100 piece quantities. Samples and production quantities will be available in April 2011 through the Avago direct sales channel and via worldwide distribution partners.

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