IC-LNB_16 Datasheet, PDF (25/37 Pages) IC-Haus GmbH – 18-BIT OPTO ENCODER

iC-LNB 18-BIT OPTO ENCODER ^preliminary
WITH SPI AND SER/PAR INTERFACES
GA (MSB)
XJD
T/2
t
t
0°
180°
Figure 16: EXOR signal at XJD in interface mode
Rev B2, Page 25/37
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 dig-
ital track occurs. This can cause an incorrect absolute
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