Anaheim Encoder ENCA5SI SingleEnded Encoder with Index Spec Sheet

							FEATURES
ORDERING INFORMATION
910 East Orangefair Ln.  Anaheim, CA 92801     Tel. (714) 992-6990      Fax. (714) 992-0471     www.anaheimautomation.com
DESCRIPTION
The ENC-A5SI is a single-ended, transmissive optical encoder module desi\
gned to detect 
the rotary position with a code wheel.  The ENC-A5SI requires a minimum shaft length of 
.445” and can be attached to the end of any shaft size ranging from .\
079” to .394” in 
diameter to provide digital feedback information.  This single-ended encoder consists of a 
LED source lens and a monolithic detector IC enclosed in a small polymer\
 package.  These 
modules implement phased array detector technology providing superior pe\
rformance and 
tolerances over traditional aperture mask type encoders.  The ENC-A5SI series provides 
digital quadrature squarewave outputs on all resolutions and are capable\
 of sinking or 
sourcing 8 mA each.  These encoders are powered from a single +5VDC power supply.
L010726
ENC-A5SI Single-Ended Encoder 
with Index ChannelENC-A5SI Single-Ended Encoder
with Index Channel
• 50 to 5,000 Cycles Per Revolution (CPR)
• Tracks 0 to 300,000 Cycles Per Second
• 200 to 20,000 Pulses Per Revolution (PPR)
• Powered From a Single +5VDC Power Supply
• Accepts +/- 0.010” Axial Shaft Play
• 2-Channel Quadrature TTL Squarewave Outputs
• Third Index Channel
• Operating Temperature of -40° to +100° C
• RoHS Compliant and REACH Certified
ENC - A5SI - 0050 - 394 - H  - G
Cover Options
E = Cover Extension
H = Hole in Cover
Blank = Default
Base Options
3 = Base Mounting Holes Become 0.125”
A = Adds Self-Aligning Shoulder to Base
G = Adds 1.812” Mounting Ears to Base
R = Adds 3-Slot Adapter to Bottom of 
Base
T  = Transfer Adhesive
Blank = Default
Index
I = Index
(3rd Channel)
Bore Size
079 = 2mm 236 = 6mm
118 = 3mm 250 = 1/4”
125 = 1/8” 276 = 7mm
156 = 5/32” 313 = 5/16”
157 = 4mm 315 = 8mm
188 = 3/16” 375 = 3/8”
197 = 5mm 394 = 10mm
CPR
504001250
96 5002000
100 5122048
192 5402500
200 7204000
250 9004096
256 1000 5000
360 1024 
						

							910 East Orangefair Ln.  Anaheim, CA 92801     Tel. (714) 992-6990     Fax. (714) 992-0471     www.anaheimautomation.com
DIMENSIONS
COVER OPTIONS
Cover Options: Description
E - Option E-Option provides a cylindrical extension cover  for larger shafts.  
The required shaft length is .445” to .750”.  
Note: E-option + R-Option the required shaft length is .570” to 
.875”.
H - Option Shafts 2mm to 1/4”, a .295” diameter hole is supplied. 
Shafts 5/16” to 10mm, a .438” diameter hole is supplied.
Required shaft length > 0.445”
 
Note: H-Option + R-Option the required shaft length is > .570”
Default Option The required length is .445” to .570”
Note: Default Option + R-Option the required shaft length is 
.570” to .695”
Note: Dimensions are in inches 
						

							BASE OPTIONS
PIN/TIMING DIAGRAMS
910 East Orangefair Ln.  Anaheim, CA 92801     Tel. (714) 992-6990     Fax. (714) 992-0471     www.anaheimautomation.com
SINGLE-ENDED ENCODER PINOUTTOP OF ENCODER FACING PLUG
Pin #Function
1 Ground
2 Index
3 Channel A
4 +5VDC Input
5 Channel B
Timing Characteristics SymbolMinTy pMax Units
Cycle Error C-3.0 5.5 °e
Symmetry X,Y150180210 °e
Quadrature Z6090120 °e
Index Pulse Width Po6090120 °e
Ch. I Rise After Ch. B or 
Ch. A  Fall t1
10100 250 ns
Ch. I Fall After Ch. B or 
Ch. A  Rise t2
70150 300 ns
(Note: Base Mounting Screws are NOT included. #2-56 or #4-40 screws can\
 be used to mount the base to your mounting surface.) 
						

							SPECIFICATIONS
910 East Orangefair Ln.  Anaheim, CA 92801     Tel. (714) 992-6990     Fax. (714) 992-0471     www.anaheimautomation.com
ACCESSORIES
ParameterMinTy pMax Units
Supply Voltage 4.55.05.5Volts
Supply Current
CPR < 500, no load
CPR ≥ 500 and < 2000, no load
CPR ≥ 2000, no load -
-
-
27
50
72 33
62
85
mA
Output Low 
I
OL = 8mA max (CPR < 2000)
I
OL = 5mA max (CPR ≥ 2000)
no load (CPR ≥ 2000) -
-
-
-
-
0.25 0.5
0.5
- Volts
Output High*
I
OL = -8mA max (CPR < 2000)
I
OL = -5mA max (CPR ≥ 2000) 
no load (CPR < 2000)
no load (CPR ≥ 2000)     
2.0
2.0 -
- -
-
4.8
3.5        
-
-
-
- Volts
Output Current Per Channel 
(CPR < 2000) -8.0
-8.0 mA
Output Current Per Channel 
(CPR ≥ 2000) -5.0
-5.0 mA
Output Rise Time (CPR < 2000) -11 0 -nS
Output Rise Time
(CPR ≥ 2000), ± 5mA load -
50 -
Output Fall Time (CPR < 2000) -11 0 -
Output Fall Time
(CPR ≥ 2000), ± 5mA load -
50 -nS
Terminology Description
CPR(N): The Number of Cycles Per Revolution
One Shaft Rotation: 360 mechanical degrees, N cycles
One Electrical Degree (°e): 1/360th of one cycle
One Cycle (C): 360 electrical degrees (°e). Each cycle can 
be decoded into 1 or 4 codes, referred to as 
X1 or X4 resolution multiplication
Symmetry: A measure of the relationship between (X) 
and (Y) in electrical degrees, nominally 180 
°e
Quadrature (Z): The phase lag or lead between channels A 
and B in electrical degrees, nominally 90 °e
Index (CH I): The Index Output goes high once per 
revolution, coincident with the low states of 
channels A and B, nominally 1/4 of one cycle 
(90°e)
Parameter
MaxUnits
Vibration (5 to 2kHz) 20g
Shaft Axial  Play +/- 0.01in.
Shaft Eccentricity Plus Radial Play 0.004in.
Acceleration 250,000rad/sec
2
* Unloaded high level output voltage is 4.80V typically, 4.2V minimum.
Recommended Operating Conditions MinMax Units
Temperature (CPR < 2000) -40100 °C
Temperature (CPR ≥ 2000) -25100 °C
Load Capacitance -100 pF
Count Frequency
(CPR ≤ 1250) -
300 kHz
Count Frequency
(CPR 2000-2500) -
360 kHz
Count Frequency (CPR 4000+) -720 kHz
Cable Part Number Length
ENC-CBL-AA5939 1 ft.
ENC-CBL-AA5939-5 5 ft.
ENC-CBL-AA5939-10 10 ft.
Cables:
Bore Size
079=2mm 236=6mm
118=3mm 250=1/4”
125=1/8” 276=7mm
157=4mm 313=5/15”
188=3/16” 375=3/8”
197=5mm 394=10mm
Centering Tools:
ENC-CTOOL - 250
The following cables are compatible with Anaheim 
Automation’s A5SI series encoder. Select a cable 
length from the table below:  Centering tools are optional, but recommended for a 
more precise installation. 
NOTE: For pricing and other information on cables 
and centering tools, please visit Accessories on our 
website.
Speed Calculation Units
CPR ≤ 1250  18x10
6 / CPRRPM
CPR 2000-2500 21.6x10
6 / CPRRPM
CPR 4000+ 43.2x10
6 / CPRRPM
*60,000 RPM is the maximum RPM due to mechanical limitations.