Signal Conditioning
The selected A and B signals are conditioned before being applied to the quadrature decoder.
Each signal is sampled at a frequency of 50 MHz and flows through a digital filter.
With such a filter:
- All the pulses having a duration larger than THIGH[ns] are transmitted to the output.
- All the pulses having a duration smaller than TLOW[ns] are blocked.
- Pulses having duration in between the above mentioned limits can be transmitted or blocked.
The following table shows for each possible value of the respective LineTrigFilter parameter:
- TLOW[ns]: the lower limit of the time constant
- THIGH[ns]: the upper limit of the time constant
LineTrigFilter |
TLOW [ns] |
THIGH [ns] |
Note |
Filter_40ns |
32 |
48 |
Only for differential inputs Recommended value for high-speed differential inputs |
OFF |
|||
Filter_100ns |
96 |
112 |
Only for differential inputs |
Filter_200ns |
192 |
208 |
Only for differential inputs |
Filter_500ns |
496 |
512 |
Only for differential inputs Default value for differential inputs |
MEDIUM |
|||
Filter_1us |
992 |
1008 |
Only for differential inputs |
Filter_5us |
4992 |
5008
|
|
STRONG |
|
||
Filter_10us |
10000 |
10016 |
Default values for isolated inputs |