3
Pulse Width (P): The number of
electrical degrees that an output
is high during 1 cycle. This value
is nominally 180°e or 1/2 cycle.
Pulse Width Error (
∆
P):
The
deviation, in electrical degrees of
the pulse width from its ideal
value of 180°e.
State Width (S):
The number of
electrical degrees between a
transition in the output of channel
A and the neighboring transition
in the output of channel B. There
are 4 states per cycle, each
nominally 90°e.
State Width Error (
∆
S):
The
deviation, in electrical degrees, of
each state width from its ideal
value of 90°e.
Absolute Maximum Ratings
Storage Temperature, T
S .....................................................................
-40°C to 125°C
Operating Temperature, T
A ................................................................
-40°C to 125°C
Supply Voltage, V
CC ......................................................................................
-0.5 V to 7 V
Output Voltage, V
O ........................................................................................
-0.5 V to V
CC
Output Current per Channel, I
out .................................................
-1.0 mA to 5 mA
Phase (
φ
):
The number of elec-
trical degrees between the center
of the high state of channel A and
the center of the high state of
channel B. This value is nominally
90°e for quadrature output.
Phase Error (
∆φ
):
The deviation
of the phase from its ideal value
of 90°e.
Direction of Rotation:
When the
codewheel rotates in the direction
of the arrow on top of the
module, channel A will lead
channel B. If the codewheel
rotates in the opposite direction,
channel B will lead channel A.
Optical Radius (R
op
):
The dis-
tance from the codewheel’s center
of rotation to the optical center
(O.C.) of the encoder module.
Recommended Operating Conditions
Parameter
Temperature
Supply Voltage
Load Capacitance
Count Frequency
Symbol
T
V
CC
C
L
f
Min.
-40
4.5
Typ.
Max.
125
5.5
100
100
Units
°C
Volts
pF
kHz
Ripple < 100 mV
p-p
3.3 kΩ pull-up resistor
Velocity (rpm) x N
60
Note:
The module performance is guaranteed to 100 kHz but can operate at higher frequencies.
Notes
Encoding Characteristics
Encoding Characteristics over Recommended Operating Range and Recommended Mounting Tolerances.
These Characteristics do not include codewheel/codestrip contributions.
Description
Pulse Width Error
Logic State Width Error
Phase Error
Sym.
∆P
∆S
∆φ
Typ.
7
5
2
Case 1 Max.
35
35
15
Case 2 Max.
45
45
20
Units
°e
°e
°e
Notes
Case 1: Module mounted on tolerance circle of
±
0.13 mm (± 0.005 in.).
Case 2: HEDT-9000 mounted on tolerances of
±
0.50 mm (0.020").
HEDT-9100 mounted ontolerances of
±
0.38 mm (0.015").
HP [ AGILENT(HEWLETT-PACKARD) ]
