Reflective Surface Mount Optical Encoder AEDR-8320 encoder analog

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Reflective Surface Mount Optical Encoder AEDR-8320 encoder analog

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AEDR-8320 Encoder
Reflective Surface Mount Optical Encoder
AEDR-8320 encoder analog output encoder that employs optical reflective technology rotary linear movement control. With introduction reflective technology, encoder packages made smaller weigh significantly lighter. This statement better reflected ability AEDR-8320 encoder which easily into many space weight constraint applications, e.g., writer laser head's linear movement. AEDR-8320 comes (Lines Inch) 7.09 lines addition 2-channel analog outputs obtain higher resolution through interpolation more. example, with interpolation, final resolution encoder will yield 1,440 lines inch, which approximately accuracy. AEDR-8320 encoder enhances design flexibility provides easy-to-assemble solution wide variety applications, while continuously ensuring reliability performance.
Features
Reflective technology Surface mount leadless package Two-channel analog voltage output Lead free package -10°C 70°C operating temperature Encoding resolution: (lines/inch) 7.09 (lines/mm)
Applications
Printers Copiers CD/DVD writer Card readers
Theory Operation
AEDR-8320 encoder combines emitter detector single surface mount, leadless package. When used with codewheel linear codestrip, encoder translates rotary linear motion into analog outputs. shown block diagram below, AEDR-8320 encoder consists three major components: light emitting diode (LED) light source, detector consisting photodiodes lens focus light beam from emitter well light falling detector. operation encoder based principle optics where detector photodiodes sense absence presence light. this case, rotary/ linear motion object being monitored converted equivalent light pattern codewheel/ codestrip. shown above diagram, reflective area (window) codewheel codestrip) reflects light back photodetector whereas light reflected non-reflective area (bar). alternating light dark patterns corresponding window fall photodiodes codewheel rotates. moving light pattern exploited detector circuitry produce analog outputs representing rotation codewheel. When codewheel coupled motor encoder outputs then direct representation motor rotation. same concept applies codestrip detect linear motion.
Definitions
State Width (S): number electrical degrees between transition Channel neighboring transition Channel There states cycle, each nominally 90°e. State Width Error (DS): deviation state width, electrical degree, from ideal value 90°e. Phase (f): number electrical degrees between center high state Channel center high state Channel Nominally 90°e. Phase Error (Df): deviation phase, electrical degree, from ideal value 90°e. Pulse Width (P): duration high state output, electrical degree, within cycle. Nominally 180°e half cycle. Pulse Width Error (DP): deviation pulse width, electrical degree, from ideal value 180°e. Count (N): number window pair revolution (CPR) codewheel. linear codestrip, defined number window pair unit length (lines inch [LPI] lines [LPmm]). Cycle (C): electrical degrees (°e). Equivalent window pair. Shaft Rotation: mechanical degrees. Also equivalent counts (codewheel only). Line Density: number window pair unit length, expressed either lines inch (LPI) lines (LPmm).
CODEWHEEL CODESTRIP
Block Diagram AEDR-8320
VLED SIGNAL PROCESSING CIRCUITRY
Optical radius (Rop): distance between codewheel center centerline between domes encoder. (G): distance from surface encoder surface codewheel codestrip. Radial Tangential Misalignment Error (ER, ET): rotary motion, mechanical displacement radial tangential directions relative nominal alignment. Angular Misalignment Error (EA): Angular displacement encoder relative tangential line. Specular Reflectance amount incident light reflected surface. Quantified terms percentage incident light. spectrometer used measure specular reflectance surface (contact factory more information).
RADIAL (ER) ANGULAR (EA) TANGENTIAL (ET)
AEDR-8320
AEDR-8320
SHAFT
SHAFT
CODEWHEEL NOTE: DRAWING SCALE
CODEWHEEL
Output Waveform
VX12 VX34
VX56
VX78
VOFFSET
Test Parameter Definitions
Name State Width Symbol Definition number electrical degrees between transition channel neighboring transition channel There states cycle, each nominally 90°e. transitions determined where analog signal crosses voltage level. DS1, DS2, DS3, DPA, SX1, SX2, SX3, deviation, electrical degrees, each state width from ideal value 90°e. number electrical degrees that analog output greater than during cycle. This value nominally 180°e cycle. deviation, electrical degrees, each pulse width from ideal value 180°e. number electrical degrees between transition channel neighboring transition channel There states cycle, each nominally 90°e. transitions determined where channel analog signal crosses with channel complimentary) signal. deviation, electrical degrees each state width from ideal value 90°e. Pulse width number electrical degrees that analog output greater than analog output during cycle. Pulse width number electrical degrees that analog output greater than analog during cycle. These value nominally 180°e cycle. deviation, electrical degrees each pulse width from ideal value 180°e. peak-to-peak signal magnitude analog signal. offset from mid-point analog peak-to-peak signal zero voltage point. value peak valley analog signal (i.e., one-sided reading). absolute difference between channel intersections channel analog waveform with that either channel component. offset from mid-point analog peak peak signal Ration percentage) maximum voltage deviation from straight line connecting adjacent upper lower crosspoint voltages difference between crosspoint voltages.
State Width Error Pulse Width Pulse Width Error State Width
State Width Error Pulse Width
DSX1, DSX2, DSX3, DSX4 PXA,
Pulse Width Error Analog Peak-toPeak Analog Offset Analog Peak Voltage
DPXA, DPXB VOFFSET VPA, VMA,
Analog Peak Peak VPPA, VPPB Voltage Analog Crosspoint Voltage Analog Offset Voltage Linearity Error Vx12, Vx34 Vx56, Vx78 VOFFSETA, VOFFSETB DLinearity
Absolute Maximum Ratings
Parameter Storage Temperature Operating Temperature Supply Voltage (Detector) Output Voltage Forward Current (LED) Reverse Voltage Symbol ILED Min. -0.5 -0.5 Max. Units Notes
Note: Exposure extreme light intensity (such from flashbulbs spotlights) cause permanent damage device. CAUTION: advised that normal static precautions should taken when handling encoder order avoid damage and/or degradation induced ESD. Proper operation encoder cannot guaranteed maximum ratings exceeded.
Recommended Operating Conditions
Parameter Operating Temperature Supply Voltage (Detector) Output Frequency Forward Current (LED) Symbol ILED Min. 4.75 Typ. Max. 5.25 Units Ripple (Velocity (rpm) N)/60 note Notes
Note: Current Limiting Resistor resistor limit current required. Supply Voltage: recommended value series resistor (±10%). Supply Voltage: recommended resistor value will (±10%). This will result current approximately
Electrical Characteristics
Parameter
Characteristics over recommended operating conditions 25°C. Symbol Min. Typical Max. Units typical Notes Supply Current (Detector) Forward Voltage
Encoding Characteristics
Encoding characteristics over recommended operating condition mounting conditions. Parameter State Width Error Pulse Width Error State Width Error Pulse Width Error Parameter Peak Peak Voltage (Average) Analog Offset Voltage Linearity Error Symbol Max. Symbol VPPA, VPPB VOFFSETA, VOFFSETB Linearity Unit Min. -350 Typ. Max. 12.5 Unit
Note: Typical values represent encoder performance typical mounting alignment, whereas maximum values represent encoder performance across range recommended mounting tolerance.
Part Mounting Tolerances
Min. Radial Misalignment from Nominal Tangential Misalignment from Nominal Distances Between Codewheel Detector Angular Misalignment -0.2 -0.2 Typ. Max. Units
Recommended Codewheel Codestrip Characteristics
CODEWHEEL CODESTRIP 70.5 (180 LPI)
NON-REFLECTIVE AREA REFLECTIVE AREA
Parameter Window/Bar Ratio Window/Bar Length Specular Reflectance Line Density Optical Radius
Symbol Ww/Wb LPmm (LPI)
Min. 1.80 (0.071)
Max. 2.31 (0.091) 7.09 (180)
Unit (inches)
Notes
Reflective area. note reflective area lines/mm (lines/inch) Recommended value
Notes: Measurements from µScan meter. Contact factory more information. Contact factory more information compatibility codewheel/strip.
Moisture Sensitive Level
AEDR-8320 specified moisture sensitive level (MSL)
Outline Drawing
0.75
2.70
4.20
CHAMFER
0.65
6.50 1.58 VLED
BOTTOM VIEW
VIEW
1.69
DETECTOR EMITTER
SIDE VIEW
NOTES: DIMENSIONS MILLIMETERS. TOLERANCE X.XX 0.15
Encoder Orientation
AEDR-8320 designed such that both detector should placed parallel window/bar orientation, shown. such, encoder tolerant against radial play 0.20 emitter side should placed closer rotating shaft.
CODEWHEEL
CODESTRIP
DIRECTION RADIAL PLAY
DIRECTION RADIAL PLAY
NOTE: DRAWING SCALE
Mounting Consideration
CODEWHEEL/CODESTRIP
11.00 (0.433
NOTE: DRAWING SCALE
Direction Codewheel Rotation
With emitter side encoder placed closer codewheel centre, Channel leads Channel when codewheel rotates anti-clockwise vice versa.
ANTI-CLOCKWISE EMITTER LEADS VIEWED FROM LEADS EMITTER
CLOCKWISE
NOTE: DRAWING SCALE
Recommended Land Pattern AEDR-8320
NOTE: SHADED AREAS LEADS SOLDERING
Recommended Lead-Free Reflow Soldering Temperature Profile
TEMPERATURE (°C) 125°C 40°C SEC. 255°C 250°C 217°C SEC. MAX. SEC.
TIME (SEC.) HEAT SOLDER PASTE SOLDER REFLOW COOL DOWN
PREHEAT TEMPERATURE 40°C 125°C TEMPERATURE MAINTAIN ABOVE 217°C PEAK TEMPERATURE TIME ABOVE 250°C
SEC. MAX. SEC. SEC.
Note: treatment high temperature, AEDR-8320 compound turn yellow after reflow.
Ordering Information
AEDR-8320 Option Shipping Units 1000 Resolution Packaging Tape Reel
Revision History
Rev. Date August 2006 February 2007 Note Preliminary datasheet creation Release data sheet
product information complete list distributors, please website:
www.avagotech.com
Avago, Avago Technologies, logo trademarks Avago Technologies Limited United States other countries. Data subject change. Copyright 2007 Avago Technologies Limited. rights reserved. AV02-0233EN August 2007

Reflective Surface Mount Optical Encoder AEDR-8320 encoder analog

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