AEDS-962 Datasheet, PDF (1/10 Pages) Agilent(Hewlett-Packard) – 300 LPI Ultra Small Optical Encoder Modules

Agilent AEDS-962x for 300 LPI
Ultra Small Optical Encoder Modules
Data Sheet
Description
This is a very small, low package
height and high performance
incremental encoder module. When
operated in conjunction with either
a codewheel or codestrip, this
module detects rotary or linear
position. The encoder 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
3.3 V supply input are accessed
through four solder plated leads
located on 2.00 mm (0.1 inch)
centers. The supply input of the
LED, rated at 16 mA, is accessed
through two leads located at
2.54 mm.
It is designed for use with an
23.36 mm optical radius codewheel
or linear codestrip. Other options
are available. Please contact the
factory for more information.
Applications
The AEDS-962x provides
sophisticated motion detection,
making closed-loop control very
cost effective. 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 and critical-care medical
equipment. Please contact a sales
representative if more
clarification is needed.
Theory of Operation
The AEDS-962x 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 Figure 1, the module
contains a single Light Emitting
Diode (LED) as its light source.
Features
• Very small
• Low package height
• Built-in codewheel and codestrip
guide bumps
• Wide resolution range
• For linear and rotary applications
• No signal adjustment required
• Insensitive to radial and axial play
• 0˚C to +70˚C operating temperature
• Two-channel quadrature output
• TTL 3.3 V CMOS compatible
• Wave solderable
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.
This IC consists of multiple sets
of photodetectors and the 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
codewheel/codestrip. The
photodiodes which detect these
interruptions are arranged in a
pattern that corresponds to the
radius and count density of the
codewheel/codestrip. These
detectors are also spaced such
that a light period on one pair of
ESD WARNING: NORMAL HANDLING PRECAUTIONS SHOULD BE TAKEN TO AVOID STATIC DISCHARGE.