EVALNV1D ICHAUS [IC-Haus GmbH], EVALNV1D Datasheet - Page 9

• Manufacturer Part Number: EVALNV1D
• Description: 6-BIT Sin/D FLASH CONVERTER
• Manufacturer: ICHAUS [IC-Haus GmbH]

Hysteresis
iC-NV has an angular hysteresis which is independent of the input amplitude and phase. It prevents the outputs
from switching when the inputs are static. The following diagram shows the effect this has with an interpolation
factor of 8..
Fig. 8: Effect of angle hysteresis
When the direction of rotation is reversed the integrated hysteresis circuit prompts the change in direction to be
signaled at the outputs; the hysteresis causes a delay here. According to the resolution the hysteresis is set to
one of the following fixed values.
Zero pulse
One zero pulse (index) is generated per cycle from the sine/cosine inputs. To be output to Z it must be enabled
by the comparator at differential inputs PZERO and NZERO. The width of the zero pulse is a quarter of the length
of the A and/or B signal output cycle. When Z is high, simultaneously A&B are high. The position of the zero pulse
dependent on the interpolation factor and the direction of rotation is given in the following table.
iC-NV
6-BIT Sin/D FLASH CONVERTER
ANGLE HYSTERESIS
INDEX POSITION
Interpolation factor
IPF
Hysteresis DEG
16
12
10
8
5
4
3
2
1
A/B period
referred to
positive direction
39,375°.. 50,625°
33,75° .. 56,25°
45°.. 50,625°
22,5 .. 67,5°
of rotation
45°.. 52,5°
36° .. 54°
45°.. 54°
30°.. 60°
0° .. 90°
5,625°
1/64
1
5,625°
1/32
2
negative direction
354,375° .. 84,625°
28,125° .. 50,625°
16,875° .. 61,875°
39,375° .. 45°
22,5° .. 52,5°
33,75° .. 45°
of rotation
37,5° .. 45°
36° .. 45°
27° .. 45°
1/16
7,5°
3
5,625°
1/16
4
1/8
9°
5
5,625°
1/8
8
1/4
10
9°
7,5°
1/4
12
5,625°
1/4
16
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