SI25101B_e.DOC / Mrz-08
Page 11 / 16
Hints for settings of DIL switch 1:
•
Under proper electrical conditions there is no imperative need to use the
filtering functions offered in the table above. When you set your
interpolation factor with use of the filter settings highlighted in the table,
there will be no further restrictions with the operating range of the unit.
•
se of the filtering functions will eliminate noise on the signal lines, but at
the same time result in some limitations and restrictions of the operating
range. The sine input frequency must not exceed the selected filter
frequency. Where you decide to use the 100 kHz filter, the unit will not
respond to frequencies higher than 100 kHz.
•
Distortions of the input signal result in fluctuation of the output frequency.
•
Use of the glitch filter results in increased interpolation times at standstill
or with low input frequencies, therefore reduces noise and jitter of the
output signal by a few increments up and down in standstill. However,
when the glitch filter is switched on, fast changes of the speed can result
in temporary proportional errors between input frequency and output
frequency during acceleration
The subsequent table shows the limits of input and output frequencies with respect to the DIL
switch settings:
Interpolation rate Interpolation time
Maximum output
frequency
Maximum input
frequency
25 ns
2 MHz
400 kHz
100 ns
2 MHz
400 kHz
400 ns
625 kHz
125 kHz
x5
1600 ns
156.25 kHz
31.25 kHz
25 ns
2,5 MHz
400 kHz
100 ns
2,5 MHz
400 kHz
400 ns
625 kHz
100 kHz
x6,25
1600 ns
156.25 kHz
25 kHz
25 ns
4 MHz
400 kHz
100 ns
2,5 MHz
250 kHz
400 ns
625 kHz
62.5 kHz
x10
1600 ns
156.25 kHz
15.625 kHz
