EN - Rotary Optical Encoder

Features

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Two channel quadrature output

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Bushing or servo mount

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Square wave signal

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Small size

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Resolution to 256 PPR

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CMOS and TTL compatible

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Long life

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Ball bearing option for high operating

speed up to 3000 rpm

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RoHS compliant*

General Information

The Bourns® EN model is a self-contained rotary optical encoder. It produces a 2-bit

quadrature signal which is suitable for digital systems where both magnitude and direction

of adjustment must be provided. The EN encoder is ideal for use as a digital panel control

or as a position sensing device in applications where long life, reliability, high resolution and

precise linearity are critical.

The EN series encoder converts rotary input into electrical signals which can be used by

microprocessors without A/D conversion.

Bourns encoder output signals are square wave digital pulses which do not require

debounce circuitry. Both features make it possible to significantly reduce the memory

overhead, wiring and wiring interconnects required by other types of control devices.

EN optical encoders offer a useful rotational life of from 10 million to 200 million shaft

revolutions, making them ideal for extended service applications. The Bourns encoder is also

compact and well suited for situations where the available space is limited.

Electrical Characteristics

Output....................................................................................2-bit quadrature code, Channel A leads Channel B by 90 º (electrical) with clockwise rotation

Resolution................................................................................................................................................................................25 to 256 cycles per revolution

Insulation Resistance (500 VDC) ...................................................................................................................................................................1,000 megohms

Electrical Travel .....................................................................................................................................................................................................Continuous

Supply Voltage......................................................................................................................................................................................... 5.0 VDC ±0.25 VDC

Supply Current...............................................................................................................................................................................................26 mA maximum

Output Voltage

Low Output ................................................................................................................................................................................................. 0.8 V maximum

High Output..................................................................................................................................................................................................... 4 V minimum

Output Current

Low Output .................................................................................................................................................................................................25 mA minimum

Rise/Fall Time..................................................................................................................................................................................................200 ns (typical)

Shaft RPM (Ball Bearing) ........................................................................................................................................................................3,000 rpm maximum

Power Consumption .................................................................................................................................................................................. 136 mW maximum

Pulse Width (Electrical Degrees, Each Channel) ............................................................................................................................................180 º ±45 º typ.

Pulse Width (Index Channel)..................................................................................................................................................................................360 º ±90 º

Phase (Electrical Degrees, Channel A to Channel B)........................................................................................................................................90 º ±45 º typ.

Environmental Characteristics

Operating Temperature Range.......................................................................................................................................-40 ºC to +75 ºC (-40 °F to +167 °F)

Storage Temperature Range ..........................................................................................................................................-40 °C to +85 °C (-40 °F to +185 °F)

Humidity................................................................................................................................................................. MIL-STD-202, Method 103B, Condition B

Vibration ............................................................................................................................................................................................................................5 G

Shock...............................................................................................................................................................................................................................50 G

Rotational Life

A & C Bushings (300 rpm maximum)**............................................................................................................................................10,000,000 revolutions

W, S & T Bushings (3,000 rpm maximum)**..................................................................................................................................200,000,000 revolutions

IP Rating..........................................................................................................................................................................................................................IP 40

**For resolutions ≤ 128 quadrature cycles per shaft revolution.

Additional Information

Click these links for more information:

PRODUCT TECHNICAL

LIBRARY

INVENTORY SAMPLES

CONTACT

Specifications are subject to change without notice.

Users should verify actual device performance in their specific applications.

The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of

this document, and at www.bourns.com/docs/legal/disclaimer.pdf.

WARNING

Cancer and Reproductive Harm

www.P65Warnings.ca.gov

*RoHS Directive 2015/863, Mar 31, 2015 and Annex.

Asia-Pacific: Tel: +886-2 2562-4117 • Email: asiacus@bourns.com

Europe: Tel: +36 88 885 877 • Email: eurocus@bourns.com

The Americas: Tel: +1-951 781-5500 • Email: americus@bourns.com

www.bourns.com