HEDT-9040 datasheet(4/10 Pages) AVAGO

Part #	HEDT-9040

Description	Two Channel Quadrature Output with Index Pulse

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Manufacturer	AVAGO [AVAGO TECHNOLOGIES LIMITED]

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4

Output Waveforms

Definitions

Count (N): The number of bar and window pairs or counts

per revolution (CPR) of the codewheel.

One Cycle (C): 360 electrical degrees (°e), 1 bar and window

pair.

One Shaft Rotation: 360 mechanical degrees, N cycles.

Position Error (

DQ): The normalized angular difference

between the actual shaft position and the position

indicated by the encoder cycle count.

Cycle Error (

DC): An indication of cycle uniformity. The dif-

ference between an observed shaft angle which gives rise

to one electrical cycle, and the nominal angular increment

of l/N of a revolution .

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 (

DP): 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 neighbor-

ing transition in the output of channel B. There are 4 states

per cycle, each nominally 90°e.

State Width Error (

DS): The deviation, in electrical degrees,

of each state width from its ideal value of 90°e.

Phase (

f): The number of electrical 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 (

Df): 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

load channel B. If the codewheel rotates in the opposite

direction, channel B will lead channel A.

Optical Radius (ROP): The distance from the codewheel’s

center of rotation to the optical center (O.C.) of the

encoder module.

Index Pulse Width (Po): The number of electrical degrees

that an index is high during one full shaft rotation. This

value is nominally 90°e or 1/4 cycle.

P

C

CH. A

CH. B

ROTATION

φ

S1

S2

S3

S4

CH. I

2.4 V

0.4 V

2.4 V

0.4 V

2.4 V

0.4 V

P0

t1

t2

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