AEDR-8300-1Wx Encoders
Reective Surface Mount Optical Encoder
Data Sheet
Description
The AEDR-8300-1Wx is the smallest optical encoder
employing reective technology for motion control
purposes. The encoder houses an LED light source and a
photo-detecting circuitry in a single package.
The AEDR-8300-1Wx oers two-channel quadrature
digital outputs. Being TTL compatible, the outputs of
the AEDR-8300-1Wx can be interfaced directly with most
of the signal processing circuitries. Hence the encoder
provides great design-in exibility and easy integration
into existing systems. The AEDR-8300-1Wx could yields
encoding resolution at 212 lines per inch (LPI) which is
8.35 lines per mm.
The AEDR-8300-1Wx provides motion sensing at a com-
petitive cost, making it ideal for high volume applications.
Its small size and surface mount package make it ideal for
many consumer products, particularly where space and
weigh are primary design constraint.
Features
• Reective technology
• Surface mount leadless package
• Two channel quadrature outputs for direction sensing
• TTL compatible output
• Single 3.3 V to 5 V supply
• -20° C to 85° C absolute operating temperature
• Encoding resolution: 212 (lines/inch) or 8.35 (lines/mm)
Applications
Ideal for high volume applications:
• Printers
• Copiers
• Card readers
• Scanners
• Cameras
• Motor Solutions
• Automated Wheel-chair
• Vending Machines
• Low Servo Systems
• ATM Machines
• Textile Machines
• Industrial Sewing Machines
• Consumer Product Applications
2
Theory of Operation
The AEDR-8300-1Wx combines an emitter and a detector
in a single surface mount leadless package. When used
with a codewheel or linear codestrip, the encoder trans-
lates rotary or linear motion into digital outputs. As seen
in the block diagram, the AEDR-8300-1Wx consists of
three major components: a light emitting diode (LED)
light source, a detector IC consisting photodiodes and
lens to focus light beam from the emitter as well as light
falling on the detector.
Block Diagram of AEDR-8300-1Wx
SIGNAL
PROCESSING
CIRCUITRY
VCC
CH A
VLED
GND
CH B
GND
RCODEWHEEL
or
CODESTRIP
Denitions
State Width (S): The number of electrical degrees between
a transition in Channel A and the neighboring transition
in Channel B. There are 4 states per cycle, each nominally
90°e.
State Width Error (∆S): The deviation of state width, in elec-
trical degree, from its ideal value of 90°e.
Phase (φ): The number of electrical degrees between the
center of high state of Channel A and the center of high
state of Channel B. Nominally 90°e.
Phase Error (∆φ): The deviation of phase, in electrical
degree, from its ideal value of 90°e.
Pulse Width (P): The duration of high state of the output,
in electrical degree, within one cycle. Nominally 180°e or
half a cycle.
Pulse Width Error (∆P): The deviation of pulse width, in elec-
trical degree, from its ideal value of 180°e.
Count (N): The number of window and bar pair per revolu-
tion (CPR) of codewheel. For linear codestrip, dened as
the number of window and bar pair per unit length (lines
per inch [LPI] or lines per mm [LPmm]).
One Cycle (C): 360 electrical degrees (°e). Equivalent to one
window and bar pair.
One Shaft Rotation: 360 mechanical degrees. Also equiva-
lent to N counts (codewheel only).
Line Density: The number of window and bar pair per unit
length, expressed in either lines per inch (LPI) or lines per
mm (LPmm).
Optical radius (Rop): The distance between the codewheel
center and the centerline between the two domes of the
encoder.
Gap (G): The distance from surface of the encoder to the
surface of codewheel or codestrip.
Radial and Tangential Misalignment Error (ER, ET): For rotary
motion, mechanical displacement in the radial and tan-
gential directions relative to the nominal alignment.
Angular Misalignment Error (EA): Angular displacement of
the encoder relative to the tangential line.
Specular Reectance (Rf): The amount of incident light
reected by a surface. Quantied in terms of the per-
centage of incident light. A spectrometer can be used to
measure specular reectance of a surface (contact factory
for more information).
The operation of the encoder is based on the principle of
optics where the detector photodiodes sense the absence
and presence of light. In this case, the rotary/linear motion
of an object being monitored is converted to equiva-
lent light pattern via the use of codewheel/codestrip. As
shown in the above diagram, the reective area (window)
of the codewheel (or codestrip) reects light back to the
photodetector IC, whereas no light is reected by the
non-reective area (bar). An alternating light and dark
patterns corresponding to the window and bar fall on
the photodiodes as the codewheel rotates. The moving
light pattern is exploited by the detector circuitry to
produce digital outputs representing the rotation of the
codewheel. When the codewheel is coupled to a motor,
the encoder outputs are then a direct representation of
the motor rotation. The same concept applies to the use
of a codestrip to detect linear motion.
3
Output waveform
Absolute Maximum Ratings
Storage Temperature, TS-40° C to 85° C
Operating Temperature, TA-20° C to 85° C
Supply Voltage, VCC -0.5 V to 7 V
Output Voltage, VO-0.5 V to VCC
Output Current per Channel, IOUT -1.0 mA to 8 mA
ESD Human Body Model JESD22-A114-A Class 2
Machine Model JESD22-A115-A Class B
Notes:
1. Exposure to extreme light intensity (such as from ashbulbs or spotlights) may cause permanent damage
to the device.
2. CAUTION: It is advised that normal static precautions should be taken when handling the encoder in order
to avoid damage and/or degradation induced by ESD.
3. Proper operation of the encoder cannot be guaranteed if the maximum ratings are exceeded.
CH. A
ALL FOUR STATES (S1 to S4)
ARE MAINTAINED
CH. B
S1
P
C
S2 S3
CODEWHEEL ROTATION OR LINEAR MOVEMENT
AMPLITUDE
S4
SHAFT
RADIAL (E
R
)
TANGENTIAL (E
T
)
AEDR-8300-1Wx
CODEWHEEL
SHAFT
ANGULAR (E
A
)
AEDR-8300-1Wx
CODEWHEEL
φ
4
Recommended Operating Conditions
Parameter Symbol Minimum Typical Maximum Units Notes
Temperature TA -20 25 85 °C
Supply Voltage VCC 3.0 3.3 / 5.0 5.5 V Ripple < 100 mVp-p
LED Current ILED 13 15 18 mA See Note 1
Load Capacitance CL 100 pF 2.7 kW Pull-Up
Count Frequency2 F 0.3 60 kHz See Note 3
Radial Misalignment ER ±0.38 (±0.015) mm (in.)
Tangential Misalignment ET ±0.38 (±0.015) mm (in.)
Angular Misalignment EA 0 ±1.5 deg.
Codewheel/strip tilt CT 0 1 deg.
Codewheel/strip Gap G 1.0 (0.04) 2.0 (0.08) 2.5 (0.10) mm (in.)
Notes:
1. LED Current Limiting Resistor:
For Vcc = 5.0 V, recommended series resistor = 220 W (±10 %)
For Vcc = 3.3 V, recommended series resistor = 110 W (± 10 %)
2. Count frequency = velocity (rpm) x N / 60.
3. Data collected based on Avago production characterization.
Encoding Characteristics
Encoding characteristics over the recommended operating condition and mounting conditions.
Parameter Symbol Typical Maximum Unit
Pulse Width Error (Ch.A, Ch.B) ∆P 16 75 °e
Phase Error ∆φ 10 60 °e
Note:
1. Typical values represent the encoder performance at typical mounting alignment, whereas the maximum values represent the encoder
performance across the range of recommended mounting tolerance.
Electrical Characteristics
Characteristics over recommended operating conditions at 25° C.
Parameter Symbol Minimum Typical Maximum Unit Notes
Detector Supply Current ICC 4.8 6.0 mA Vcc = 5 V
3.9 4.1 Vcc = 3.3 V
High Level Output Voltage VOH 2.4 V IOH = -0.2 mA
Low Level Output Voltage VOL 0.4 V IOL = 8.0 mA
Rise Time tr 500 ns CL = 25 pF
RL = 2.7 kW
Fall Time tf 100 ns
5
LED Current Limiting Resistor
A resistor to limit current to the LED is required. The
recommended value is 220 W (± 10%) and the resistor
should be placed in series between the 5 V supply and pin
3 of the device (VLED). This will result in an LED current of
approximately 15 mA. If 3.3 V voltage supply is used, the
corresponded resistance would be 110 W (± 10%).
Recommended Codewheel and Codestrip Characteristics
Moisture Sensitive Level
The AEDR-8300-1Wx is specied to moisture sensitive
level (MSL) 3.
Parameter Symbol Minimum Maximum Unit Notes
Window/bar Ratio Ww/Wb 0.9 1.1
Window/bar Length LW 1.80
(0.071)
2.31
(0.091)
mm
(inches)
Specular Reectance Rf 60 85 Reective area. See note 1.
– 10 Non reective area
Line Density LPmm
(LPI)
8.35
(212)
8.35
(212)
lines/mm
(lines/inch)
Optical radius Rop 11 mm Recommended value
Notes:
1. Measurements from TMA µScan meter. Contact factory for more information.
2. Contact factory for more information on compatibility of codewheel/strip.
W
b
W
w
W
w
W
b
L
w
R
op
L
w
6
PIN 6
PIN 5
PIN 4PIN 3
PIN 2
PIN 1
Emitter
Detector
Chamfer PIN 6
PIN 5
PIN 4 PIN 3
PIN 2
PIN 1
Top View
Side View
Bottom View
Encoder Pin Conguration
Encoder option Pin 1 Pin2 Pin3 Pin4 Pin5 Pin6
AEDR-8300-1Wx Ch B Gnd VLED Gnd Ch A Vcc
Encoder Orientation
The AEDR-8300-1Wx is designed such that both the LED and detector IC should be placed parallel to the window/bar
orientation, as shown. As such, the encoder is tolerant against radial play of ± 0.38 mm. The emitter side (pins 3 and 4)
should be placed closer to the rotating shaft.
Notes:
1. All dimensions in millimeter.
2. Tolerance X.XX ± 0.15mm.
3. For ease of reference, a chamfer is incorporated on the detector side (pin 6), as shown in the above diagram.
Outline Drawing
7
Mounting Consideration
Codewheel/codestrip
Gap
11.00 mm (0.433 IN) < Rop < ∝
Rop
Direction of Codewheel Rotation
With the emitter side (pins 3 and 4) of the encoder placed closer to the codewheel centre, Channel A leads Channel B
when the codewheel rotates anti-clockwise and vice versa.
Viewed from Top
CH. A LEADS
CH. B
EMITTER
ANTI-CLOCKWISE
CH. B LEADS
CH. A
EMITTER
CLOCKWISE
Recommended Land Pattern for AEDR-8300-1Wx
1.96
0.72
1.08
0.94 Mounting Center
Note: The shaded areas are the
leads for soldering.
Note: The shaded areas are
not encoder pin-outs. They
are electrically grounded and
physically exposed. PCB layout
with tracks running across these
areas should be avoided.
For product information and a complete list of distributors, please go to our web site: www.avagotech.com
Avago, Avago Technologies, and the A logo are trademarks of Avago Technologies in the United States and other countries.
Data subject to change. Copyright © 2005-2013 Avago Technologies. All rights reserved. Obsoletes AV01-0178EN
AV02-3572EN - September 9, 2013
Recommended Lead-free Reow Soldering Temperature Prole
Preheat Temperature 40° C to 125° C = 120 sec max
Temperature maintain above 217° C = 60 – 150 sec
Peak Temperature = 255 ± 5° C
Time above 250° C = 10 – 20 sec
Note: Due to treatment of high temperature, AEDR-8300-1Wx compound may turn to yellow after IR reow.
Resolution Indicator
Since the encoder is too small to imprint resolution
marking on its package, color-coding the package is
employed to dierentiate resolutions.
Resolution (LPI) 212
Color Light Amber
AEDR-8300 Option 1W
Shipping Units
0 – 1000 pcs
1 – 500 pcs
2 – 100 pcs
Note: Encoders are packed in tape of quantity 1000 pcs, 500 pcs or 100 pcs.
Ordering Information