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AEDA-3200-Txx Series
Data Sheet
Ultra Miniature, High Resolution Incremental Encoders
Description
The AEDA-3200-T series (top mounting type) are high performance, cost effective, three-channel optical incremental encoder modules. AEDA-3200-T series emphasize high reliability, high resolution and easy assembly, using transmissive encoder technology 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 specific applications with the specially designed mechanical alignment tool.
Features
Two channel quadrature output with index Quick and easy assembly with alignment tool Cost-effective Ultra miniature size (o17 mm) Resolution options from 2500 to 7500 Cycles Per Revolution (CPR), up to 30000 counts with 4X decoding * Integrated RS 422 differential line driver * * * * *
Outline Drawing
2
Theory of Operation
The AEDA-3200 translates rotary motion of a shaft into a three channel digital output. The AEDA-3200 series has five key parts: a single light emitting diode (LED) light source, a photodetector IC with a set of uniquely configured 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 final 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).
Output Waveforms
3
Definitions
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 (): 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 90e. Pulse Width (P): The number of the electrical degrees that an output is a high-level during one cycle, nominally 180e or 1/2 a cycle. Pulse Width Error (P): The deviation in electrical degrees of the pulse width from its ideal value of 180e. Index Pulse Width (Po): The number of electrical degrees that an index is high during one full shaft rotation. This value is nominally 90e or 1/4 cycle. State Width (S): The number of the electrical degrees between a transition in the output of the channel B. There are 4 states per cycle, each nominally 90e. State Width Error (S): The deviation in electrical degrees of each state width from its ideal value of 90e.
Direction of Motor Rotation
When the codewheel rotates in a clockwise direction, channel A will lead channel B (Figure 1 illustrates the definition 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.
Absolute Maximum Ratings
Storage Temperature Operating Temperature Supply Voltage Output Voltage Output Current per Channel Frequency -40C to 125C -40C to 125C 4.5 V to 5.5 V -0.5 V to Vcc 20 mA 750 kHz
Recommended Operating Conditions
Parameter Temperature Supply Voltage Frequency Symbol TA VCC f Min. -40 4.5 Typical 25 5.0 125 Max. 125 5.5 750 Units C Volts kHz Ripple <100 mVp-p f = RPM x CPR 60 Notes
Maximum Frequency and RPM
CPR 2500 5000 6000 7200 7500 Maximum Frequency (kHz) 750 1 750 750 750 750 Maximum RPM2 12000 9000 7500 6250 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.
Electrical Characteristics
Electrical characteristics over recommended operating conditions. Typical values at 2oC.
Parameter Supply Current High level Output Voltage Low level Output Voltage
Symbol ICC VOH VOL
Min. 2.5
Typical 55 3.4 0.3
Max. 80 0.5
Units mA V V
Encoding Characteristics
Encoding characteristics over recommended operating conditions. Typical values at 2oC.
Parameter Pulse Width Error State Width Error Phase Error
Symbol P S
Typical 5 5 1
Max. 85 60 40
Units e e e
Mechanical Characteristics
(Refer to page 2 for details.)
Parameter Standard Shaft Diameters Mounting Screw Size:
Dimension/Details 2 mm diameter maximum * M2.5 x 0.45 (Recommended Length 6 mm)
Tolerance
Units mm
-.002/-.007 (-.0001/-.0003) mm (in)
* Note: 1. Using a step shaft, maximum shaft diameter is 4 mm.
Pin Assignments
Pin Pin 1 Pin 2 Pin 3 Pin 4 Pin 5 Pin 6 Pin 7 Pin 8 Pin 9 Pin 10 Signal A+ AGnd Gnd B+ BVcc Vcc I+ IDescription Digital Output Digital Output Ground Pin Ground Pin Digital Output Digital Output Input Voltage Input Voltage Digital Output 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 flat ribbon cable.
Alignment Considerations
The mechanical alignment tool is intended to absorb normal installation misalignment and runouts. To achieve the optimum 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.
Electrical Interface
Avago recommends National Semiconductor DS26C32AM Quad Differential Line Receiver or compatible as line receiver. Unused pin should be grounded for noise reduction.
HEDS-890 Mechanical Alignment Tool.
Ordering Information
AEDA-3200- T Resolution Options (CPR) AJ 2,500 B1 5,000 B7 6,000 BJ 7,200 BK 7,500 Counts After 4x Decoding 10,000 20,000 24,000 28,800 30,000
Alignment Tool HEDS-8940
Remark 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 (c) 2006 Avago Technologies, Limited. All rights reserved. Obsoletes AV01-0175EN AV01-0619EN - November 1, 2006

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