HEDS-9740#250 Avago Technologies US Inc., HEDS-9740#250 Datasheet

HEDS-9740#250

Manufacturer Part Number

HEDS-9740#250

Description

Encoders 2 Channel 300CPR

Manufacturer

Avago Technologies US Inc.

Datasheet

1.HEDS-9740250.pdf (6 pages)

Specifications of HEDS-9740#250

Number Of Channels

Mounting Style

PCB

Supply Voltage

5 V

Product

Optical

Technology

Linear

Termination Style

Solder Pin

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

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HEDS-974x Series

For 180, 300, 360 LPI Small Optical Encoder Modules

Data Sheet

Description

The HEDS-974x series is a high performance, low cost,

optical incremental encoder module. When operated in

conjunction with codestrip, this module detects linear

position. The module consists of a lensed LED source and

a detector IC enclosed in a small C-shaped plastic package.

Due to a highly collimated light source and a unique

photodetector array, the module is extremely tolerant to

mounting misalignment.

The two-channel digital outputs and 5 V supply input are

accessed through four solder-plated leads located on 2.54

mm (0.1 inch) centers.

Applications

The HEDS-974x provides sophisticated motion detection

at a low cost, making close-loop control very cost-

competitive! Typical applications include printers,

plotters, copiers, and office automation equipment.

Note: Agilent Technologies encoders are not

recommended for use in safety critical applications. Eg.

ABS braking systems, power steering, life support systems

and critical care medical equipment. Please contact sales

representative if more clarification is needed.

Theory of Operation

The HEDS-974x 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 digital outputs.

As seen in the block diagram, the module contains a

single Light Emitting Diode (LED) as its light source. The

light is collimated into a parallel beam by means of a

single lens located directly over the LED. Opposite the

emitter is the integrated detector circuit.

ESD WARNING: NORMAL PRECAUTIONS SHOULD BE TAKEN TO AVOID STATIC DISCHARGE.

This IC consists of multiple sets of photodetectors and the

signal processing circuitry necessary to produce the digital

waveforms.

The codestrip moves between the emitter and detector,

causing the light beam to be interrupted by the pattern of

spaces and bars on the codestrip. The photodiodes which

detect these interruptions are arranged in a pattern that

corresponds to the count density of the codestrip. These

detectors are also spaced such that a light period on one pair

of detectors corresponds to a dark period on the adjacent

pair 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 digital

output of channel A is in quadrature with channel B

(90 degrees out of phase).

Features

• Small size

• Multiple mounting options

• Wide resolution range

• Linear options available

• No signal adjustment required

• Insensitive to radial and axial play

• –40

• High resolution version of the HEDS-970x

• Two-channel quadrature output

• TTL or 5.0 V CMOS compatible

• Single 5 V supply

• Wave solderable

• Integrated 2.5 K

C to +85

C operating temperature

Ω

pullup on outputs

Related parts for HEDS-9740#250

HEDS-9740#250 Summary of contents

Page 1

... For 180, 300, 360 LPI Small Optical Encoder Modules Data Sheet Description The HEDS-974x series is a high performance, low cost, optical incremental encoder module. When operated in conjunction with codestrip, this module detects linear position. The module consists of a lensed LED source and a detector IC enclosed in a small C-shaped plastic package ...

Page 2

Definitions Count (N) = the number of bar and window pairs or Counts Per Revolution (CPR) of the codewheel, or the number of Lines Per Inch (LPI) of the codestrip. 1 Shaft Rotation = 360 mechanical degrees = N cycles ...

Page 3

Recommended Operating Conditions Parameter Symbol Temperature T Supply Voltage V CC Load Capacitance C L Pullup Resistor R L Count Frequency Angular Misalignment E A Electrical Characteristics over Recommended Operating Range, Typical at T Parameter Supply Current High Level Output ...

Page 4

Recommended Codewheel and Codestrip Characteristics Parameter Window/Bar Ratio Center of Post to Inside Edge of Window Center of Post to Outside Edge of Window Center of Post to Inside Edge of Codestrip Mounting Considerations ± 4.44 0.13 ± 0.175 0.005 ...

Page 5

... Resolution Options Lead Bend Q – 180 LPI, linear 0 – Straight Leads 2 – 300 LPI, linear 1 – Bend Leads 1 – 360 LPI, linear 50 51 HEDS-9740 HEDS-9741 10.8 ± 0.7 R 1.4 3.0 R 2.6 1.4 5.0 4.2 3.9 0.8 1.70 ± 0.22 3.90 ± 0.15 1 ...

Page 6

For product information and a complete list of distributors, please go to our website: 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 © ...

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