Features ■ ■ ■ ■ ■ ■ ■ Two channel quadrature output Bushing or servo mount Square wave signal Index channel available Small size Resolution to 256PPR ■ ■ CMOS and TTL compatible Long life High operating speed EN - Rotary Optical Encoder Electrical Characteristics Output ..................................................................2-bit gray code, Channel A leads Channel B by 90º (electrical) with clockwise rotation Supply Voltage .............................................................................................................................................................5.0 VDC ±0.25 VDC* Supply Current...................................................................................................................................................................26 mA maximum Output Voltage Low Output.........................................................................................................................................................................0.8V maximum High Output ............................................................................................................................................................................4V minimum Output Current Low Output........................................................................................................................................................................25mA minimum Insulation Resistance (500 VDC).........................................................................................................................................1,000 megohms Rise/Fall Time ........................................................................................................................................................................200ns (typical) Shaft RPM (Ball Bearing) .............................................................................................................................................3,000 rpm maximum Power Consumption .......................................................................................................................................................136 mW maximum Pulse Width (Electrical Degrees, Each Channel)...................................................................................................................180º ±45º TYP. Pulse Width (Index Channel) .........................................................................................................................................................360º ±90º Phase (Electrical Degrees, Channel A to Channel B)..............................................................................................................90º ±45º TYP. Index Channel Centered on 1-1 State Combination of A and B Channels.......................................................................................0º ±45º *Consult factory for other voltages up to 15 VDC. Environmental Characteristics Operating Temperature Range (Standard) ...........................................................................................................................-40ºC to +85ºC Vibration ...................................................................................................................................................................................................5G Shock .....................................................................................................................................................................................................50G Humidity .....................................................................................................................................MIL-STD-202, Method 103B, Condition B Mechanical Characteristics Torque (Starting and Running) A & C Bushings (Spring Loaded for Optimum Feel) ...................................................................................................1.5 oz-in. maximum W, S & T Bushings (Ball Bearing Shaft Support) ........................................................................................................0.1 oz-in. maximum Mechanical Rotation...................................................................................................................................................................Continuous Shaft End Play ..........................................................................................................................................................0.012” T.I.R. maximum Shaft Radial Play ......................................................................................................................................................0.005” T.I.R. maximum Rotational Life A & C Bushings (300 rpm maximum)** ..................................................................................................................10,000,000 revolutions W, S & T Bushings (3,000 rpm maximum)**.........................................................................................................200,000,000 revolutions Weight ................................................................................................................................................................................................0.4 oz. **For resolutions ≤ 128 quadrature cycles per shaft revolution. STANDARD RESOLUTIONS AVAILABLE OUTPUT TABLE OUTPUT VOLTAGE Channel A Channel B Index Channel (Optional) 4.0V (Min) 0.8V (Max) 4.0V (Min) 0.8V (Max) 4.0V (Min) 0.8V (Max) 1 0 1 0 1 0 For Non-Standard Resolutions— Consult Factory 1 cycle 360° ± 90° (Full quadrature output cycles per shaft revolution) 25* 125 50* 128 64 200 100 256 Clockwise rotation * Channel B leads Channel A Specifications are subject to change without notice. ROTARY OPTICAL 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. 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. The EN series encoder converts rotary input into electrical signals which can be used by microprocessors without A/D conversion. EN - Rotary Optical Encoder Dimensional Drawings How To Order Optional Radial Leads .635 SQ. (.025) 2.54 TYP. (.100) 18.5 (.73) 6.35 (.250) BOURNS EN SERIES OPTICAL ENCODER 15.88 (.625) E N C 1 J-D 2 8-L 0 0 2.36 (.093) 21.21 (.835) 9.525 (.375) 8.636 (.34 ) 1/4-32 UNEF 3.167 + .000/ – .0076 DIA. (.1247 + .000/ – .0003) 9.53 (.375) 1.37 (.054) Bushing Style C 7.14 + .000/ – .0508 DIA. (.281 + .000/ – .002) 10.32 + .000/ – .0508 DIA. (.4062 + .000/ – .002) 9.53 (.375) 6.342 + .000/ – .0076 DIA. (.2497 + .000/ – .0003) 3/8-32 UNEF 9.53 (.375) 9.53 (.375) 1.57 3/8-32 UNEF (.062) 6.342 + .000/ – .0076 DIA. (.2497 + .000/ – .0003) 1/4-32 UNEF 1.57 (.062) 3.167 + .000/ – .0076 DIA. (.1247 + .000/ – .003) Bushing Style S (Ball Bearing) Bushing Style A GROUND 1.57 (.062) 21.8 (.86) Vcc .254 ± .076 (.010 .003) .787 ± .254 (.031 ± .010) SHAFT LENGTH* Code Description 1/2" Long 16 5/8" Long 20 7/8" Long 28 SWITCHING CONFIGURATION Code Description Channel A Leads Channel B 1 By 90 (Clockwise Rotation)** Code 1 Switching 2 With Index Channel Anti-rotation Lug View Bushing Style T (Ball Bearing) TERMINATION DIAGRAM INDEX OR CHANNEL A N.C. R. ANTI-ROTATION LUG POSITION Code Description None D 9:00 Position J Rear MountP ing Bracket 3.167 + .000/ – .0076 DIA. (.1247 + .000/ – .003) CHANNEL B Optional Radial Leads - A + B 19.05 ± .0127 DIA. (.7500 ± .0005) 22.2 + .0127 / – .1270 DIA. (.875 + .0005 / – .0050) Servo Mount Style W (Ball Bearing) Consult factory for options not shown, including: • Wire lead or cable options • Connectors • Non-standard resolutions • Special shaft/bushing sizes and features • Special performance characteristics • PCB mounting bracket TERMINAL*** CONFIGURATION Code Description L Axial, MultiPurpose Pin Radial, MultiR Purpose Pin Rear Ribbon M Cable with Connector Side Ribbon N Cable with Connector Rear Ribbon W Cable - No Connector Side Ribbon Y Cable - No Connector RESOLUTION Cycles Per Code Revolution 25 00025 50 00050 64 00064 100 00100 125 00125 128 00128 200 00200 256 00256 1.57 (.062) 1.57 (.062) 1 2 8 SHAFT STYLE Code B D C Description 1/4" Dia., Plain End 1/8" Dia., Plain End 1/4" Dia., Single Flatted Use With Bushings (Code) A, S C, T, W A, S BUSHING CONFIGURATION Code Description A 3/8"D X 3/8"L Threaded C 1/4"D X 1/4"L Threaded S 3/8"D X 3/8"L Threaded (Ball Bearing) 1/4"D X 3/8"L Threaded T (Ball Bearing) Servo Mount 7/8"D W (Ball Bearing) * Shaft length measured from mounting surface. ** 25 and 50ppr is reversed (Channel B leads Channel A) *** Standard ribbon cable is 10" long Consult factory for other lengths. Specifications are subject to change without notice.