... | ... | @@ -14,9 +14,80 @@ use LEMO 00 connectors** |
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-----
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## Technical specification
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## Specifications
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- [Functional system specifications](FmcDelFuncSpec)
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- Full details in the [Functional system
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specifications](FmcDelFuncSpec)
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### Specification overview
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<table>
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<tbody>
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<tr class="odd">
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<td><strong>Parameter</strong></td>
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<td><strong>Value</strong></td>
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</tr>
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<tr class="even">
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<td>Channels</td>
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<td>1 trigger input, 4 outputs</td>
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</tr>
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<tr class="odd">
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<td>Connectors</td>
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<td>LEMO 00 for all signals</td>
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</tr>
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<tr class="even">
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<td>Signal level</td>
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<td>TTL, outputs capable of driving a 50 Ohm load, > 2 V/ns slew rate</td>
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</tr>
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<tr class="odd">
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<td>Operating modes</td>
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<td><strong>Pulse delay</strong>: on trigger, generates a pulse or series of pulses of given width and repetition rate on chosen outputs after a certain time programmed by the user.<br />
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<strong>Single channel TDC</strong>: time tags incoming trigger pulses available via a circular buffer.<br />
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<strong>Pulse generator</strong>: produces a pulse or a series of pulses of arbitrary length and repetition rate starting at a given UTC/TAI time.</td>
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</tr>
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<tr class="even">
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<td>Minimum input pulse width</td>
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<td>100 ns. Pulses below 24 ns are ignored.</td>
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</tr>
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<tr class="odd">
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<td>Maximum input pulse rate</td>
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<td>2 MHz (minimum pulse spacing: 50 ns)</td>
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</tr>
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<tr class="even">
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<td>Output pulse width</td>
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<td>50 ns - 1 s (10 ps resolution)</td>
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</tr>
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<tr class="odd">
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<td>Output pulse spacing</td>
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<td>100 ns - 1 s (10 ps resolution)</td>
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</tr>
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<tr class="even">
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<td>Output pulse repeat count (train generation)</td>
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<td>1 - 65536 pulses or infinity (continuous mode)</td>
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</tr>
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<tr class="odd">
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<td>Timebase accuracy</td>
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<td>± 4ppm<br />
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The timebase from a local TCXO on FMC card needs calibration. The 4ppm accuracy is the one of the on-board TCXO. Cesium-quality accuracy will be reached when used on a <a href="https://www.ohwr.org/project/white-rabbit/wikis/Description">White Rabbit</a> enabled FMC carrier.</td>
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</tr>
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<tr class="even">
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<td>TDC Resolution</td>
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<td>28 ps</td>
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</tr>
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<tr class="odd">
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<td>TDC Precision (std. dev)</td>
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<td>55 ps</td>
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</tr>
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<tr class="even">
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<td>Accuracy</td>
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<td>± (300 ps + timebase accuracy)</td>
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</tr>
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<tr class="odd">
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<td>Time tag buffer</td>
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<td>1024-entries circular buffer with time tags for input/output pulses. Buffer interrupt (with timeout/threshold coalescing)</td>
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</tr>
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</tbody>
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</table>
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-----
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