AEDS-964X
Small Optical Encoder Modules 150, 300, and 360 LPI Digital Output
Data Sheet
Description
Features
The AEDS-964X is a very small, low package height and
high performance incremental encoder module. It can
operate at supply voltage, Vcc, 3.3/5 V and the output
voltage, Voh, will follow the Vcc voltage level.
Small Size
When operated in conjunction with a codestrip, this
module detects linear position. The encoder consists of
lensed LED source and a detector IC enclosed in a small
C-shaped plastic package. Due to the brighter LED,
coupled with a photodetector array, which is less sensitive
to light, the encoder is highly tolerant to aerosol environment. This module is extremely receptive to mounting
misalignment.
The two channel digital outputs and Vcc, supply voltage
input, are accessed through four solder plated leads
located on 2.00 mm (0.1 inch) centers. The supply input of
LED, rated at 16 mA is accessed through two leads located
at 2.54 mm.
It is designed for use with a linear codestrip/codewheel.
Other options are available. Please contact the factory for
more information.
Built-in guide bumps for codewheel and codestrip
Low Package Height
Insensitive to Radial, Tangential and Axial Play
0° C to +70° C recommended operating temperature
Wide Resolution Range
Two Channel Quadrature Output
TTL 3.3 V or 5.0 V CMOS compatible
For Linear and Rotary Application
Wave solderable
RoHS Compliant
Applications
Printers
Copiers/Fax
Plotters
Office Automation Equipments
Theory of Operation
Definitions
The AEDS-964X is a C-shaped emitter/detector module.
Coupled with a codewheel, it translates rotary motion into
a two-channel digital output; coupled with a codestrip, it
translates linear motion into a two-channel digital output.
Note: Refer to Figure 1 for the output waveform
As seen in the Figure 1, the module contains a single
Light Emitting Diode (LED) as its light source. The light is
collimated into parallel beam by means of a single lens
located directly over the LED. Opposite the emitter are the
integrated detector circuits.
Count (N): The number of bar and window pairs or counts
per revolution (CPR) of the codewheel. Or the number of
lines per inch of the codestrip (LPI)
1 shaft Rotation = 360 degrees
= N cycles
1 cycle (c) = 360 electrical degree, equivalent to 1 bar and
window pair.
This IC consists of multiple sets of photodetectors and
a signal processing circuitry necessary to produce the
digital waveforms.
Pulse Width (P): The number of electrical degree that an
output is high during one cycle. This value is nominally
180° e or ½ cycle.
The codewheel/codestrip moves between the emitter and
detector, causing the light beam to be interrupted by the
pattern of spaces and bars on the codehweel/codestrip.
The photodiodes that detect these interruptions are
arranged in a pattern that corresponds to the radius and
count density of the codewheel/0codestrip.
Pulse Width Error (P): The deviation, in electrical degrees,
These detectors are also spaced such that a light period
on one pair of detectors corresponds to a dark period on
the adjacent pairs of detectors. The photodiode outputs
are fed through the signal processing circuitry.
Two comparators receive these signals and produce the
final outputs for Channels A and B. Due to this integrated
phasing technique the output of channel A is in quadrature with Channel B (90 degrees out of phase).
of the pulse width from its ideal value of 180° e.
State Width (S): The number of electrical degrees between
a transition in the output of channel A and the neighboring transition in the output of channel B. There are 4 states
per cycle, each nominally 90° e.
State Width Error (S): The deviation, in electrical degrees
of each state width from its ideal value of 90°.
Phase (): The number of electrical degrees between the
center of the high state of channel A and the center of the
high state of channel B.
Phase Error (): the deviation of the phase from its ideal
value of 90° e.
Direction of Rotation: When the codewheel rotates in the
counter clockwise direction (as viewed from the encoder
end of the motor), channel A will lead channel B. If the
codewheel rotates in the clockwise direction, channel B
will lead channel A.
Optical Radius (Rop): The distance from the codewheel’s
center of the rotation to the optical center (O.C) of the
encoder modules.
Angular Misalignment Error (EA): Angular misalignment
of the sensor in relation to the tangential direction. This
applies for both rotary and linear motion.
Mounting Position (RM): Distance from Motor Shaft center of
rotation to center of Alignment Tab receiving hole.
2
AEDS-964x Series Block Diagram
Output Waveform
3
Absolute Maximum Ratings
Parameter
Symbol
Min.
Max.
Units
Notes
Storage Temperature
TS
-40
85
°C
Operating Temperature
TA
0
70
°C
Supply Voltage (Detector)
VCC
-0.5
7
Volts
Output Voltage
Vo
-0.5
Vcc
V
Output current per channel
Io
-1.5
10
mA
Option P – 150 LPI
-1.5
17
mA
Option 1 & 2 – 360 LPI
Soldering Temperature
TSOL
260
°C
t ≤ 7 sec
DC Forward
ILED
40
mA
VF < 1.8 V
Reverse Voltage
VR
5
V
IR = 100 A
Subjecting the part to stresses beyond those listed under this section may cause permanent damage to the device. These are stress ratings only and
do not imply that the devices function beyond these ratings. Exposure to the extremes of these conditions for extended periods may affect device
reliability.
Recommended Operating Conditions
Parameter
Symbol
Min.
Typ.
Max.
Units
Temperature
TA
0
25
70
°C
Supply Voltage (Detector)
VCC
2.8
3.3 or 5.0
Load Capacitance
CL
Pullup Resistor
Rpull
Count Frequency
Cf
Angular Misalignment
EA
Mounting Position
RM
DC Forward Current (LED)
@ Vcc = 3.3 V
ILED
4
5.5
Volts
100
pF
none
-3.0
0.0
16
Ripple < 100 mVpp
k
Recommended no pullup.
60
kHz
Velocity (rpm) x N/60
+3.0
Deg.
Mounting consideration
mm
(inch)
* Refer to mounting
consideration
mA
Recommended 110 (±10%)
series resistor between 3.3 V
supply and VLED.
ROP – 2.4
(Rop-0.095”)
10
Notes
20
Electrical Characteristics
Electrical Characteristics over Recommend Operating Range, typical at 25° C
Parameter
Symbol
Min.
Typ. @ 3.3 V
Max.
Units
Supply Current (Detector)
ICC
1.5
3.0
8
mA
High Level Output Voltage
Option P – 150 LPI
Option 1 & 2 – 300 & 360 LPI
VOH
2.4
2.4
3.3
3.3
5.2
5.2
V
V
Typ. IOH = -0.7 mA @ 3.3 V
Typ. IOH = -0.4 mA @ 3.3 V
Low Level Output Voltage
Option P – 150 LPI
Option 1 & 2 – 300 & 360 LPI
VOL
0.4
0.4
V
V
Typ. IOH =8 mA @ 3.3 V
Typ. IOH = 13 mA @ 3.3 V
Rise Time
tr
200
ns
Fall Time
tf
50
ns
CL = 25 pF
RL = 11 k
LED Forward Voltage
VF
V
Typical IF = 16 mA
1.3
(turn on)
1.6
1.8
Notes
Note: Refer to Figure 2 for output waveform on tr and tf
Encoding Characteristics
Encoding Characteristics over the Recommended
Operating Conditions and Mounting Conditions. These
characteristics do not include codewheel/codestrip
contribution.
1. The typical values are average over the full rotation
of the codewheel at Nominal Mouting Position and
Typical Operating Conditions.
2. For a codestrip, the Typical Values are obtained at
zero angular displacement and Typical Operating
Conditions.
5
3. Maximums are the worst case values predicted over
the full range of Recommended Mounting Tolerances
and Operating Conditions, with consideration to population shift.
Parameter
Symbol
Typ.
Max.
Units
Pulse Width Error
P
7
40
e
Logic State Width Error
S
5
40
e
Phase Error
2
20
e
Mounting Configuration
Note:
These dimensions include shaft end play and codewheel warp. All dimensions for mounting in the module and codewheel/codestrip should be
measured with respect to the two mounting post shown above.
For AEDS-964X-P10
Error
Rop = 11.00 mm
Unit
Notes
Recommend CW to put closer to the detector side (upper side),
in order to give enough margin for encoder operation.
Eg
Gap
± 0.15
mm
Er
Radial
± 0.13
mm
Et
Tangential
± 0.13
mm
Ea
Angular
±3
Deg.
For AEDS-964X-210 and AEDS-964X-110
Error
Rop = 23.36 mm
Unit
Notes
Eg
Gap
± 0.15
mm
Recommend CW to put closer to the detector side (upper side),
in order to give enough margin for encoder operation.
Er
Radial
± 0.26
mm
Et
Tangential
± 0.28
mm
Ea
Angular
±3
Deg.
6
Package Dimension
AEDS-9640-X10 (Straight Lead)
7
AEDS-9641-X10 (Bent Lead)
8
Recommended Wave Solder Profile
Pb-free Wave Soldering Profile - Std-Profile 2
7 sec Max
260 °C
Temperature (°C)
A
B
C
Reflow
120°C/120 sec Max
Cool Down
Time (s)
Parameter
Min.
Max.
Nominal values
Units
A
Solder Pot Temperature
NA
260
250 – 260
°C
B
Preheat Zone Temperature
85
120
100 – 120
°C
C
Dip in Time
5
7
5
sec
D
Solder Pot Zone (Encoder Lead)
200
260
NA
°C
Notes:
– Nominal values are evaluated profiles for optimum performance.
– Min/Max are critical limits to ensure encoders in good condition.
9
Ordering Information
Bracket Option
10
AEDS-964
Option
Lead Configuration
0 - Straight Leads
1 - Bent Leads
Resolution Option
1 - 360LPI
2 - 300 LPI
P - 150 LPI
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 © 2005-2012 Avago Technologies. All rights reserved. Obsoletes AV01-0286EN
AV02-3574EN - June 11, 2012
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