AEDR-8300-1W2 Avago Technologies US Inc., AEDR-8300-1W2 Datasheet - Page 2

• Manufacturer Part Number: AEDR-8300-1W2
• Description: Encoders 2 Channel 212LPI
• Manufacturer: Avago Technologies US Inc.
• Series: -r

Specifications of AEDR-8300-1W2

• Number Of Channels: 2
• Mounting Style: SMD/SMT
• Supply Voltage: 3.3 V / 5 V
• Operating Temperature Range: - 20 C to + 85 C
• Product: Optical
• Size / Dimension: 3.96 mm x 5.12 mm x 1.63 mm
• Technology: Linear and Rotary
• Termination Style: Solder Pad
• Sensing Distance: 0.079" (2mm)
• Sensing Method: Reflective
• Sensing Object: Codewheel/Codestrip
• Output Configuration: -
• Sensing Light: -
• Mounting Type: Surface Mount
• Current - Supply: 2.2mA
• Voltage - Supply: 4.5 V ~ 5.5 V
• Package / Case: 5.12mm L x 3.96mm W x 1.63mm H
• Features: Compact Model
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

V LED
CH A
CH B
Theory of Operation
The AEDR-8300-1Wx combines an emitter and a
detector in a single surface mount leadless package.
When used with a codewheel or linear codestrip, the
encoder translates rotary or linear motion into digital
outputs. As seen in the block diagram, the AEDR-8300-
1Wx consists of three major components: a light
emitting diode (LED) light source, a detector IC
consisting photodiodes and lens to focus light beam
from the emitter as well as light falling on the detector.
Block Diagram of AEDR-8300-1Wx
GND
GND
The operation of the encoder is based on the principle
of optics where the detector photodiodes sense the
absence and presence of light. In this case, the rotary/
linear motion of an object being monitored is
converted to equivalent light pattern via the use of
codewheel/codestrip. As shown in the above diagram,
the reflective area (window) of the codewheel (or
codestrip) reflects light back to the photodetector IC,
whereas no light is reflected by the non-reflective area
(bar). An alternating light and dark patterns
corresponding to the window and bar fall on the
photodiodes as the codewheel rotates. The moving
light pattern is exploited by the detector circuitry to
produce digital outputs representing the rotation of
the codewheel. When the codewheel is coupled to a
motor, the encoder outputs are then a direct
representation of the motor rotation. The same concept
applies to the use of a codestrip to detect linear
motion.
2
V CC
PROCESSING
CIRCUITRY
SIGNAL
R
CODEWHEEL
or
CODESTRIP
Definitions
State Width (S): The number of electrical degrees
between a transition in Channel A and the neighboring
transition in Channel B. There are 4 states per cycle,
each nominally 90°e.
State Width Error (∆ ∆ ∆ ∆ ∆ S): The deviation of state width,
in electrical degree, from its ideal value of 90°e.
Phase (φ φ φ φ φ ): The number of electrical degrees between
the center of high state of Channel A and the center of
high state of Channel B. Nominally 90°e.
Phase Error (∆φ
degree, from its ideal value of 90°e.
Pulse Width (P): The duration of high state of the
output, in electrical degree, within one cycle. Nominally
180°e or half a cycle.
Pulse Width Error (∆ ∆ ∆ ∆ ∆ P): The deviation of pulse width,
in electrical degree, from its ideal value of 180°e.
Count (N): The number of window and bar pair per
revolution (CPR) of codewheel. For linear codestrip,
defined as the number of window and bar pair per
unit length (lines per inch [LPI] or lines per mm
[LPmm]).
One Cycle (C): 360 electrical degrees (°e). Equivalent
to one window and bar pair.
One Shaft Rotation: 360 mechanical degrees. Also
equivalent to N counts (codewheel only).
Line Density: The number of window and bar pair per
unit length, expressed in either lines per inch (LPI) or
lines per mm (LPmm).
Optical radius (Rop): The distance between the
codewheel center and the centerline between the two
domes of the encoder.
Gap (G): The distance from surface of the encoder to
the surface of codewheel or codestrip.
Radial and Tangential Misalignment Error (E
For rotary motion, mechanical displacement in the
radial and tangential directions relative to the nominal
alignment.
Angular Misalignment Error (E
displacement of the encoder relative to the tangential
line.
Specular Reflectance (R
reflected by a surface. Quantified in terms of the
percentage of incident light. A spectrometer can be
used to measure specular reflectance of a surface
(contact factory for more information).
∆φ
∆φ): The deviation of phase, in electrical
∆φ
∆φ
f
): The amount of incident light
A
): Angular
R
, E
T
):