IC-LNB_13 Datasheet, PDF (24/35 Pages) IC-Haus GmbH – 18-BIT OPTO ENCODER WITH SPI AND SER/PAR INTERFACES

iC-LNB 18-BIT OPTO ENCODER ^preliminary
WITH SPI AND SER/PAR INTERFACES
GA (MSB)
XJD
t
0°
Rev A1, Page 24/35
T/2
t
180°
Figure 16: EXOR signal at XJD in interface mode
Radial adjustment to code disc
The digital tracks’ distance determines the maximum
tolerable offset from the radial ideal position. Starting
from an offset of > 100 µm a crosstalk of the nearby
digital track occurs. This can cause an incorrect abso-
lute position.
A radial offset causes amongst others an alteration
in the phase contact between sine/cosine signals.
Thereby with minimizing the phase error the radial po-
sition can be adjusted in a range of about ±150 µm.
Table 16 illustrates the phase error at a radial offset of
100 µm.
Code disc
LNB1S 42-1024
LNB4S 26-1024
Phase error
0.65°
1.6°
Table 16: Phase error at a radial offset of 100 µm