AEDA-3200-Txx Series
Ultra Miniature, High Resolution Incremental Encoders
Data Sheet
Description
The AEDA-3200-T series (top mounting type) are high
performance, cost eective, three-channel optical
incremental encoder modules.
AEDA-3200-T series emphasize high reliability, high resolu-
tion and easy assembly, using transmissive encoder tech-
nology to sense rotary position. Outputs of the AEDA-3200
encoders are two channel quadrature outputs and a third
channel gated index output. These encoder modules can
be easily mounted to customer specic applications with
the specially designed mechanical alignment tool.
Features
• Two channel quadrature output with index
• Quick and easy assembly with alignment tool
• Cost-eective
• Ultra miniature size (ø17 mm)
• Resolution options from 2500 to 7500 Cycles Per
Revolution (CPR), up to 30000 counts with 4X decod-
ing
• Integrated RS 422 dierential line driver
2
Outline Drawing
3
Output Waveforms
Theory of Operation
The AEDA-3200 translates rotary motion of a shaft into a
three channel digital output. The AEDA-3200 series has
ve key parts: a single light emitting diode (LED) light
source, a photodetector IC with a set of uniquely cong-
ured photodiodes, an interpolator IC, a line driver IC and
a pair of lenses.
This light is used to produce internal signals A and A-,
and B and B-.
As part of the “push-pull” detector system, these signals
are fed through comparators and line driver that are part
of the signal processing circuitry to produce the nal
outputs for channels A.
The AEDA-3200 is available for cycles per revolution (CPR)
of 2500 to 7500. This translates to a maximum resolution
of 30000 counts after quadrature decode (4X).
4
Denitions
Count (N): N refers to the cycles per revolution (CPR) of the
encoder output.
One Cycle (C): 360 electrical degrees (°e).
One Shaft Rotation: 360 mechanical degrees, N cycles (rotary
motion only).
Phase (φ): The number of electrical degrees between the
center of the high state on the channel A and the center of
the high state of channel B. This value is nominally 90°e.
Pulse Width (P): The number of the electrical degrees that an
output is a high-level during one cycle, nominally 180°e
or 1/2 a cycle.
Pulse Width Error (∆P): The deviation in electrical degrees of
the pulse width from its ideal value of 180°e.
Index Pulse Width (Po): The number of electrical degrees that
an index is high during one full shaft rotation. This value
is nominally 90°e or 1/4 cycle.
State Width (S): The number of the electrical degrees be-
tween a transition in the output of the 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°e.
Direction of Motor Rotation
When the codewheel rotates in a clockwise direction,
channel A will lead channel B (Figure 1 illustrates the de-
nition of clockwise direction of codewheel rotation). When
the codewheel rotates in a counter-clockwise direction,
channel B will lead channel A.
Figure 1. Viewed from the PCB encoder end.
Recommended Operating Conditions
Parameter Symbol Min. Typical Max. Units Notes
Temperature TA -40 25 125 °C
Supply Voltage VCC 4.5 5.0 5.5 Volts Ripple <100 mVp-p
Frequency f 125 750 kHz f = RPM x CPR
60
Absolute Maximum Ratings
Storage Temperature -40°C to 125°C
Operating Temperature -40°C to 125°C
Supply Voltage 4.5 V to 5.5 V
Output Voltage -0.5 V to Vcc
Output Current per Channel 20 mA
Frequency 750 kHz
Maximum Frequency and RPM
CPR Maximum Frequency (kHz) Maximum RPM2
2500 750 1 12000
5000 750 9000
6000 750 7500
7200 750 6250
7500 750 6000
Note:
1. Maximum frequency will be lower due to limitation in maximum RPM.
2. Maximum mechanical limit is 12000 RPM, operating limit is dependent on the maximum operating frequency.
5
Electrical Characteristics
Electrical characteristics over recommended operating conditions. Typical values at 25oC.
Parameter Symbol Min. Typical Max. Units
Supply Current ICC 55 80 mA
High level Output Voltage VOH 2.5 3.4 V
Low level Output Voltage VOL 0.3 0.5 V
Encoding Characteristics
Encoding characteristics over recommended operating conditions. Typical values at 25oC.
Parameter Symbol Typical Max. Units
Pulse Width Error ∆P 5 85 °e
State Width Error ∆S 5 60 °e
Phase Error ∆φ 1 40 °e
Mechanical Characteristics
(Refer to page 2 for details.)
Parameter Dimension/Details Tolerance Units
Standard Shaft Diameters 2 mm diameter maximum * -.002/-.007 (-.0001/-.0003) mm (in)
Mounting Screw Size: M2.5 x 0.45 mm
(Recommended Length 6 mm)
* Note:
1. Using a step shaft, maximum shaft diameter is 4 mm.
6
HEDS-8940 Mechanical Alignment Tool.
Pin Assignments
Pin Signal Description
Pin 1 A+ Digital Output
Pin 2 A- Digital Output
Pin 3 Gnd Ground Pin
Pin 4 Gnd Ground Pin
Pin 5 B+ Digital Output
Pin 6 B- Digital Output
Pin 7 Vcc Input Voltage
Pin 8 Vcc Input Voltage
Pin 9 I+ Digital Output
Pin 10 I- Digital Output
Notes:
1. Both Pin 7 and Pin 8 must be connected to Vcc.
2. Either Pin 3 or Pin 4 must be connected to Gnd.
Mating Connector
AEDA-3200 requires a 5 x 2 (1.27 mm x 1.27 mm) female
IDC Connector. An example of the suggested mating
connectors is Samtec (www.samtec.com) part number:
FFSD-05-D-x-01-N. The cable used is 0.635 mm pitch at
ribbon cable.
Electrical Interface
Avago recommends National Semiconductor DS26C32AM
Quad Dierential Line Receiver or compatible as line receiv-
er. Unused pin should be grounded for noise reduction.
Alignment Considerations
The mechanical alignment tool is intended to absorb normal
installation misalignment and runouts. To achieve the opti-
mum performance, user should minimize misalignment.
Complete instructions for AEDA-3200 installation can
be found in Application Note 5080, Avago AEDA-3200-T
Mechanical Mounting and Installation Consideration.
AEDA-3200 Mechanical Alignment tool part number is
HEDS-8940.
Ordering Information
Alignment Tool Remark
HEDS-8940 Mechanical Alignment Tool
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 © 2006 Avago Technologies, Limited. All rights reserved.
Obsoletes AV01-0175EN
AV01-0619EN - November 1, 2006
A E D A - 3 2 0 0 - T
Resolution Options (CPR) Counts After 4x Decoding
A J
B 1
B 7
B J
B K
2,500
5,000
6,000
7,200
7,500
10,000
20,000
24,000
28,800
30,000