Advantech PCI-1716H handleiding
Handleiding
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25 PCI-1716_Series User Manual
Chapter 3 Function Details
3.2 Analog Output
3.2.1 Analog Output Resolution
Analog output voltage or current is generated by a DAC, which has a finite resolution.
For example, a 16-bit DAC divides the output range into 65,536, which is 216, codes.
These codes represent output voltage or current which are equally distributed across
the output range. If the output range is ±10 V, the resolution is
Because resolution depends on output range, as stated in the previous equation, a
smaller output range has higher (finer) resolution, and vice versa. Choose an output
range that matches the maximum possible range of the output signal. If a larger-than-
required range is used, the resolution is reduced; if a smaller-than-required range is
used, on the other hand, the required output range cannot be covered.
3.2.2 Analog Output Signal Glitch
3.2.2.1 DAC Code Change Glitch
When the output voltage or current of an analog output channel changes, glitches
may be observed. This is a normal phenomenon due to released charges of the
DAC. The largest glitches occur when the most significant bit of the DAC code
changes.
To preserve the slew rate and settling time specifications, no further signal condition-
ing is applied in the device. If the glitches are unacceptable, an external low-pass
deglitching filter can be used to reduce the glitches. However, user should verify that
the frequency response and distortion of the signal due to the deglitching filter can
still meet the requirement of the applications.
3.2.2.2 Power-On Glitch
For other devices which do not have power-on glitch remover, when the device is
powered-on, glitches may be observed at the analog output channels. This is
because the internal power supplies and the DAC control circuitry are not stable yet.
In this device, however, each analog output channel is equipped with a switch as the
power-on glitch remover. The switch is closed only when the internal power supplies
and the DAC control circuitry are stable, which result in no power-on glitch. This is
shown in Figure 3.6.
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Productinformatie
| Merk | Advantech |
| Model | PCI-1716H |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 5374 MB |
