HEDS-9710 HP [Agilent(Hewlett-Packard)], HEDS-9710 Datasheet - Page 2

• Manufacturer Part Number: HEDS-9710
• Description: 200 lpi Analog Output Small Optical Encoder Modules
• Manufacturer: HP [Agilent(Hewlett-Packard)]

Absolute Maximum Ratings
Recommended Operating Conditions
2
The module contains a single
Light Emitting Diode (LED) as its
light source. The light is colli-
mated into a parallel beam by
means of a single lens located
directly over the LED. Opposite
the emitter is the integrated de-
tector circuit. This IC consists of
multiple sets of photodetectors
and the signal processing cir-
cuitry necessary to produce the
analog waveforms.
The codewheel/codestrip moves
between the emitter and detector,
causing the light beam to be in-
terrupted by the pattern of spaces
and bars on the codewheel/
codestrip. The photodiodes which
detect these interruptions are
arranged in a pattern that corre-
sponds to the radius and count
density of the codewheel/
codestrip. These detectors are
also spaced such that a light
period on one pair of detectors
corresponds to a dark period on
the adjacent pair of detectors.
The photodiode outputs are fed
through the signal processing
circuitry, which produces the
final outputs for channels A and
B. Due to this integrated phasing
technique, the analog output of
channel A is in quadrature with
channel B (90 degrees out of
phase).
Parameter
Storage Temperature
Operating Temperature
Supply Voltage
Soldering Temperature
Parameter
Temperature
Supply Voltage
Count Frequency
Symbol
T
V
CC
Symbol
T
T
V
S
A
CC
Package Dimensions
See HEDS-9700 datasheet for
package outline drawings.
Definitions
Count (N): The number of bar
and window pairs or Counts Per
Revolution (CPR) of the code-
wheel, or the number of Lines Per
Inch (LPI) of the codestrip.
1 Shaft Rotation = 360 mechanical
1 cycle (c) = 360 electrical
Pulse Width (P): The number of
electrical degrees that an output
is high during one 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 four states per cycle, each
nominally 90 e.
Min.
15
4.8
Min.
–40
15
–0.5
= 1 bar and window pair
degrees ( e)
= N cycles
degrees
Max.
45
5.2
8
Max.
85
45
7
260
Units
V
kHz
State Width Error ( S): The
deviation, in electrical degrees, of
each state width from its ideal
value of 90 e.
Phase ( ): 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 nomi-
nally 90 e for quadrature output.
Phase Error (
tion of the phase from its ideal
value of 90 e.
Direction of Rotation: When
the codewheel rotates counter-
clockwise, as viewed looking
down on the module (so the
marking is visible), channel A will
lead channel B. If the codewheel
rotates in the opposite direction,
channel B will lead channel A.
Optical Radius (R
distance from the codewheel’s
center of rotation to the optical
center (O.C.) of the encoder
module.
Mounting Position (R
Distance from Motor Shaft center
of rotation to center of Alignment
Tab receiving hole.
Units
V
C
C
C
Notes
Ripple < 100 mV
(Velocity (rpm) x N) 60
): The devia-
Notes
t 5 sec.
OP
): The
M
):
p-p