Note: All specications are subject to change without prior notication.
AEDR-8300 Series Encoders
Reective Surface Mount Optical Encoder
Data Sheet
Features
• Reective technology
• Surface mount small outline leadless package
• Single channel incremental output
• Two channel quadrature outputs for direction sens-
ing
• TTL compatible output
• Single 5V supply
• -20oC to 85oC absolute operating temperature
• Encoding resolution options:
36, 75, 150, 180 (lines/inch) or 1.42, 2.95, 5.91, 7.09
(lines/mm)
Description
The AEDR-8300 series is the smallest optical encoder
employing reflective technology for motion control
purposes. The encoder houses an LED light source and
a photo-detecting circuitry in a single package.
The AEDS-8300 series offers options of either single
channel or two-channel quadrature digital outputs.
Being TTL compatible, the outputs of the AEDR-8300
series 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 series is available in four reso-
lutions, namely 36, 75, 150 and 180 lines per inch (LPI)
(1.42, 2.95, 5.91 and 7.09 lines per mm respectively).
This range of resolutions caters for dierent design and
application needs.
Applications
The AEDR-8300 series provides motion sensing at a
competitive cost, making it ideal for high volume appli-
cations. Its small size and surface mount package make
it ideal for printers, copiers, card readers and many con-
sumer products, particularly where space and weigh are
design constraint.
2
Theory of Operation
The AEDR-8300 series combines an emitter and a detec-
tor in a single surface mount leadless package. When
used with a codewheel or linear codestrip, the encoder
translates rotary or linear motion into digital outputs.
As seen in the block diagram, the AEDR-8300 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.
The operation of the encoder is based on the principle
of optics where the detector photodiodes sense the ab-
sence and presence of light. In this case, the rotary/lin-
ear motion of an object being monitored is converted
to equivalent light pattern via the use of codewheel/
codestrip. As shown in the diagram below, 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 ro-
tates. The moving light pattern is exploited by the de-
tector circuitry to produce digital outputs representing
the rotation of the codewheel. When the codewheel is
coupled to a motor, the encoder outputs is then a direct
representation of the motor rotation. The same concept
applies to the use of a codestrip to detect linear motion.
Figure 1. Block Diagram of AEDR-8300.
AEDR-8300 block diag
V
LED
GND
V
CC
CH A
CH B
GND
SIGNAL
PROCESSING
CIRCUITRY
RCODEWHEE
L
OR
CODESTRIP
Denitions
State Width (S): The number of electrical degrees be-
tween a transition in Channel A and the neighboring
transition in Channel B. There are 4 states per cycle,
each nominally 90oe.
State Width Error (∆S): The deviation of state width, in
electrical degree, from its ideal value of 90oe.
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 90oe.
Phase Error (∆φ): The deviation of phase, in electrical
degree, from its ideal value of 90oe.
Pulse Width (P): The duration of high state of the out-
put, in electrical degree, within one cycle. Nominally
180oe or half a cycle.
Pulse Width Error (∆P): The deviation of pulse width, in
electrical degree, from its ideal value of 180oe.
Count (N): The number of window and bar pair per rev-
olution (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 (oe). Equivalent to
one window and bar pair.
3
AEDR-8300 angular misalign.
AEDR-8300
SHAFT
CODEWHEEL
RADIAL (ER)
TANGENTIAL (ET)
AEDR-8300
SHAFT
CODEWHEEL
ANGULAR (EA)
AEDR-8300 output wave.
S1 S2 S3 S4 φ
P
C
CH. B
CH. A
ALL FOUR STATES (S1 TO S4)
ARE MAINTAINED.
CODEWHEEL ROTATION OR LINEAR MOVEMENT
AMPLITUDE
One Shaft Rotation: 360 mechanical degrees. Also
equivalent 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 code-
wheel 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.
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).
Radial and Tangential Misalignment Error (ER, ET): For
rotary motion, mechanical displacement in the radial
and tangential directions relative to the nominal align-
ment.
Angular Misalignment Error (EA): Angular displace-
ment of the encoder relative to the tangential line.
4
AEDR-8300 Recommended Operating Conditions
Parameter Sym. Min. Typ. Max. Units Notes
Temperature TA -20 25 85 °C
Supply Voltage VCC 4.5 5 5.5 V Ripple< 100mVp-p
LED Current ILED 13 15 18 mA See note 1
Load Capacitance CL 100 pF 2.7 kW Pull-Up
Count Frequency f 30 kHz AEDR-83X0-K/P/Q
See Note 2
Count Frequency f 15 kHz AEDR-8310-V
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.)
Note:
1. Refer to “LED Current Limiting Resistor” in Page 6.
2. Count frequency = velocity(rpm)xN/60.
AEDR-8300 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 degrada-
tion induced by ESD.
3. Proper operation of the encoder cannot be guaranteed if the maximum ratings are exceeded.
5
AEDR-8300 Encoding Characteristics
Encoding characteristics over the recommended operating condition and mounting conditions.
Parameter Symbol Typical Maximum Units Notes
Pulse Width Error ∆P 15 55 °e AEDR-8310-K
16 75 °e AEDR-8310-V
Pulse Width Error ∆P 15, 25 55, 75 °e AEDR-8300-K
(Ch.A, Ch. B) ∆P 16 75 °e AEDR-8300-P
∆P 16 75 °e AEDR-8300-Q
Phase Error ∆φ 12 60 °e AEDR-8300-K
∆φ 10 60 °e AEDR-8300-P
∆φ 10 60 °e AEDR-8300-Q
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.
AEDR-8300 Electrical Characteristics
Characteristics over recommended operating conditions at 25°C.
Parameter Sym. Min. Typ. Max. Units Notes
Detector Supply Current ICC 2.2 5.0 mA
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 CL = 25 pF, RL = 2.7 kW
AEDR-8300 Encoder Pin Conguration
Encoder option Pin 1 Pin 2 Pin 3 Pin 4 Pin 5 Pin 6
AEDR-8310-K/V NC Gnd VLED Gnd Ch A Vcc
AEDR-8300-K/P/Q Ch B Gnd VLED Gnd Ch A Vcc
6
AEDR-8300 codewheel
R
OP
W
b
W
w
L
w
L
w
W
w
W
b
Recommended Codewheel and Codestrip Characteristics
LED Current Limiting Resistor
A resistor to limit current to the LED is required. The
recommended value is 220W (±10 %) and the resistor
should be placed in series between the 5V supply and
pin 3 of the device (Vled). This will result in an LED cur-
rent of approximately 15 mA.
Parameter Symbol Min. Max. 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)
Spectular Reectance Rf 60 85 Reective area. See note 1.
— 10 Non-reective area
Line Density LPmm (LPI) 1.42 (36) 1.42 (36) lines/mm (inch) AEDR-8310-V
LPmm (LPI) 2.95 (75) 2.95 (75) lines/mm (inch) AEDR-8310-K, AEDR-8300-K
LPmm (LPI) 5.91 (150) 5.91 (150) lines/mm (inch) AEDR-8300-P
LPmm (LPI) 7.09 (180) 7.09 (180) lines/mm (inch) AEDR-8300-Q
Optical Radius Rop 11 11 mm Recommended value
Notes:
1. Measurements from spectrometer. Contact factory for more information.
2. Contact factory for more information on compatibility of codewheel/strip.
Moisture Sensitive Level
The AEDR-8300 series is specied to moisture sensitive
level (MSL) 3.
7
0.95
0.60
2.06
1.96
PIN 4
PIN 5
PIN 6 PIN 1
PIN 2
PIN 3
3.96
5.12
PIN 3
PIN 4PIN 5PIN 6
PIN 2PIN 1
All dimensions in millimeters.
Tolerance x.xx ± 0.15 mm.
1.63
5.12 3.96
1.63
Chamfer
Detector Emitter
+
Outline Drawing
Note:
For ease of reference, a chamfer is marked on the detector side (pin
6), as shown in the above diagram.
Encoder Orientation
The AEDR-8300 series is designed such that both the
LED and detector IC should be placed parallel to the
window/bar orientation, as shown. As such, the en-
coder is tolerant against radial play of ±0.38 mm. The
emitter side (pins 3 and 4) should be placed closer to
the rotating shaft.
Codewheel
Direction of
radial play Direction of
radial play
Codestrip
8
Mounting Consideration
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.
Rop
Gap
Codewheel/codestrip
11.00 mm (0.433 IN) < ROP < ∞
Ch. A leads
Ch. B
emitter
Ch. B leads
Ch. A
emitter
Anti-
clockwise Clockwise
Viewed from Top
9
Recommended Land Pattern for AEDR-8300 Series
Recommended Lead-free Reow Soldering Temperature Prole
0
50
100
150
200
250
300
TIME (sec.)
60
- 1
50
sec
125°C
TEMPERATURE (°C)
Cool Down
Heat up Solder Paste Dry Solder Reflow
120 sec max
40°C
10 - 20 sec
255°C
250°C
217°C
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 transparent compound is expected to turn yellow
after IR reow.
Ordering Information
AEDR-83 _ 0 Option _ _ _
Number of Channel
1 – One channel
0 – Two channels
Packaging
1 – Tape and Reel
Lines per inch
K – 75LPI
P – 150LPI [1]
Q - 180LPI [1]
V - 36LPI [2]
Shipping Units
0 – 1000 pcs
1 – 500 pcs
2 - 100 pcs
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. The details are:
36 LPI = Green package
75LPI = Clear package
150LPI = Red package
180LPI = Amber package
Note:
1. 150LPI and 180LPI resolutions are only available in two channel options
2. 36LPI resolution is only available in one channel option
3. Encoders are packed in tape quantities of 100, 500 or 1000 pieces.
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, Limited in the United States and other countries.
Data subject to change. Copyright © 2007 Avago Technologies Limited. All rights reserved. Obsoletes 5989-0464EN
AV02-0088EN - June 21, 2007
Summary of Product Availability
Resolution
Options
One
Channel
Two
Channel
Packing Quantity
1000 500 100
36LPI NA
75LPI
150LPI NA
180LPI NA