Enclosed Incremental
Rotary Optical Encoder
EX20
Standard Features
Series
Offering improved design and
performance characteristics, the EX20
Series provides high precision angular
position signals at an affordable price.
They are ideally suited for robotic,
process control, instrumentation and
other related applications.
Based on an innovative design
consisting of a patented disk and hub
assembly, reliability is assured through
the use of a single LED source and
collimating lens, with increased
reliability by means of Duncan’s
proprietary, single-chip Opto-ASIC
detector. This also enables use in signal
conditioning applications without need
of additional electronics.
Models EX202 and EX203 offer 74F365 and 74F368
Buffer Driver outputs, yielding temperature stability and the
ability to transmit signals over a long distance with high
noise immunity.
Model EX206 features 26LS31 line driver output, ideal
for applications where RS422 compatibility is needed.
The EX20 Series provides the combination of excellent
electronics, reliability, and a lower component count
approach, offering enhanced long-term operation and
improved temperature stability.
• Line count resolutions up to 2540 PPR
• High sink current capability (Models EX202 and EX203)
• RS422 compatible 26LS31 differential line driver
(Model EX206)
• Index Pulse with gateable option (Models EX203 and
EX206)
• Flange or Servo mount configurations
• Focused IR/LED
• 100kHz frequency response w/option to 350kHz
• 2-Year Warranty
Figure 1
Servo Mount
1.66
(47)
Figure 2
Flange Mount
(Dimensions not shown, same as Figure 1)
.125
(3.2)
.12
(3)
.11
(2.8)
.50
(15)
.2497 +0000
(6,34) -0003
+000
-002
.687
(17.45)
1.875
(47.6)
#4-40 THDS. X .20 DP
ON 1.00 DIA. B.C.
(25.4)
.18
(4.5)
.875 TYP.
(22.2)
2.05
(52.3)
2.06 SQ.
52.3
STRAIN
RELIEF
8 PIN
HEADER
All dimensions in inches
.xx = ±.02
.xxx = ±.005
.125 DIA
4 PLCS.
(3.2)
15771 Red Hill Avenue
Tustin, CA 92780-7303
(714) 258-7500 Fax: (714) 258-8120
email: sales@beiduncan.com
www.beiduncan.com
ISO9001 Certified/QS9000 Compliant
EX20 Series
Enclosed Incremental Rotary Optical Encoder
Performance Specifications
Mechanical
Dimensions
Weight
Shaft Size
Shaft Load
Torque, Starting
Running
Inertia
1.8 x 10
-4
oz. in./sec
2
see Figures 1 and 2
4 oz.
0.2497 +0.0000 -0.0003
axial 4 lbs., radial 8 lbs.
less than 0.4 oz. in.
less than 0.2 oz. in.
Termination Options
Header
Mating Connector
included
Terminal board
8 pin single row PC board header
(Molex 22-23-2081 or equivalent)
Molex 22-01 3087 or equivalent with
crimp terminals for 22-30 AWG wire
1/16" circuit board, one row of 8 holes,
0.40 dia. plated through on
0.10 centers for 22-30 AWG wire
Electrical
Code
incremental
Pulses per Revolution
see “Ordering Information”
Supply Voltage
+5V ±5% @ 135mA max.
Output Format
Dual channel quadrature w/compliments on all
models: INDEX pulse on EX203 and EX206
Output Type (EX202, EX203)
TTL buffer driver
Output Voltage
(74F365 and 74F368 or equiv.)
Sink Current
65mA
Output Type (EX206) TTL differential line driver (26LS31 or equiv.)
should be terminated into a line receiver
(26LS32, or equivalent circuit)
Frequency Response
(Option to 350kHz)
Environmental
Temperature
Operating 0° to +85°C
(Optional to 105°C Operating)
Storage -40°C to 105°C
Figure 4
360°E NOM.
180°E NOM.
90°E NOM.
A
A
B
B
Figure 3
Pinout
87654321
A
A
*Z - index
*Z- index
* EX203 & EX206 only
+5v
GND
B
B
90°E TO 450°E
INDEX
**INDEX
**INDEX
CW ROTATION OF SHAFT
EX202 Outputs: A and B w/compliments only as shown above
EX203 Outputs: A, B and Index w/compliments as shown above
EX206 Outputs: as shown above
** Gateable index option available, consult factory
Ordering Information
EX20 # - #### - #
Basic Model No.
Output Format
2 = Quadrature w/complements (74F365 and
74F368 Buffer Driver)
3 = Quadrature w/index & complements
(74F365 and 74F368 buffer driver)
6 = Quadrature w/index & complements
(26LS31 line driver)
Pulses Per Revolution (PPR)
See Table 1
Mounting and Termination
1 = Servo mount w/header
2 = Servo mount w/terminal board
3 = Flange mount w/header
4 = Flange mount w/terminal board
EXAMPLE: EX203-1024-3
Table 1
AVAILABLE RESOLUTIONS (PPR):
200, 400, 500, 512, 1000, 1024,
2000, 2048, 2500 and 2540
Other resolutions available, consult factory.
Specifications subject to change without notice. Printed in U.S.A.
BE2055
15771 Red Hill Avenue
Tustin, CA 92780-7303
(714) 258-7500 Fax: (714) 258-8120
email: sales@beiduncan.com
www.beiduncan.com
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