AEDS-9641-110

AEDS-9641-110 Datasheet


AEDS-964X Small Optical Encoder Modules 150, 300, and 360 LPI Digital Output

Part Datasheet
AEDS-9641-110 AEDS-9641-110 AEDS-9641-110 (pdf)
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AEDS-964X Small Optical Encoder Modules 150, 300, and 360 LPI Digital Output

Data Sheet

The AEDS-964X is a very small, low package height and high performance incremental encoder module. It can operate at supply voltage, Vcc, V and the output voltage, Voh, will follow the Vcc voltage level.

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 mm inch centers. The supply input of LED, rated at 16 mA is accessed through two leads located at mm.

It is designed for use with a linear codestrip/codewheel. Other options are available. Please contact the factory for more information.
• Small Size
• 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 V or V CMOS compatible
• For Linear and Rotary Application
• Wave solderable
• RoHS Compliant
• Printers
• Copiers/Fax
• Plotters
• Office Automation Equipments

Theory of Operation

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.

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.

This IC consists of multiple sets of photodetectors and a signal processing circuitry necessary to produce the digital waveforms.

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.

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 .

Definitions

Note Refer to Figure 1 for the output waveform
1 shaft Rotation = 360 degrees = N cycles
1 cycle c = 360 electrical degree, equivalent to 1 bar and window pair.

Pulse Width P The number of electrical degree that an output is high during one cycle. This value is nominally 180° e or cycle.

Pulse Width Error The deviation, in electrical degrees, 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 The deviation, in electrical degrees of each state width from its ideal value of

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.

AEDS-964x Series Block Diagram Output Waveform

Absolute Maximum Ratings

Parameter

Min.

Max.

Units

Notes

Storage Temperature Operating Temperature Supply Voltage Detector Output Voltage Output current per channel

Volts

Option P 150 LPI

Option 1 & 2 360 LPI

Soldering Temperature
Ordering Information

AEDS-964

Option

Bracket Option 10

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:

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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Datasheet ID: AEDS-9641-110 520027