V680 8-channel VME time-to-digital converter
- 8-channel, 48-bit, 48 picosecond resolution
- Measures events up to 6800 seconds before or after common trigger, or 0 to +13,700 seconds after trigger
- Adjustable trigger levels and edge polarity
- Usable as 9-channel independent time-stamper
- Fast readout available 200 nanoseconds after events
- Jitter typically below 40 picoseconds RMS
- Ultrastable ovenized quartz crystal timebase
- Optional custom internal microengine
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The V680 is an 8-channel time-to-digital converter used to record the time of occurrence of eight independent electrical pulse inputs, each measured relative to a single, common reference input. Each input channel can time its event "hit" with 48.82-picosecond resolution and 48-bit dynamic range.
The module has provisions for adjustable input logic levels, selectable input edge polarity, and selectable termination.
The V680 employs a highly linear interpolation technique which requires a minimum of adjustments. Data is available within 200 nanoseconds of the completion of the measured time intervals, and the module may be cleared and rearmed in less than one microsecond. All features are switch selectable.
| FUNCTION | 8-channel VME time-to-digital converter |
| DEVICE TYPE | Register based slave: A16:D16:D08(EO) |
| INPUTS | One common reference input (T8) Eight individual event inputs (T0-T7) One external input (GATE) enables event channels Two inputs (AUX) support custom control logic One clock I/O (CLK) |
| INPUT LEVELS | The thresholds of the event inputs are adjustable as a group in the range ±2.5 V Their impedance (high-Z or 50Ω) and polarity (rising or falling edge) can also be selected individually The GATE input has a separate threshold level adjustment. Its impedance (high-Z or 50Ω) and polarity (high or low) are also selectable The AUX inputs are TTL-compatible |
| OUTPUTS | AUX1 normally indicates module armed and ready to accept an event |
| RESOLUTION | 48.828125 ps, equivalent to 20.48 GHz clock |
| RANGE | 48 bits (±6871 sec) for bipolar mode |
| JITTER | <(75ps + 2x10-9 x delay) RMS |
| LINEARITY | ±0.25 LSB |
| TIMEBASE | Internal ovenized crystal oscillator Accuracy 0.01 PPM/°C aging <1 PPM/year Internal phase-lock-loop allows utilization of an external 10 MHz timebase |
| POWER | Standard VME supplies : +5: 2.8 A max +12: 1.1 A max at startup, 600 mA max after warm-up -12: 1.4 A max at startup, 800 mA after warm-up |
| CONNECTORS | Standard SMB; optional LEMO |
| INDICATORS | LEDs indicate module access and acquisition/readout mode status |
| PACKAGING | 6U single-wide VME module |
V680-1: 8-channel VME time-to-digital converter with SMB connectors
V680-2: 8-channel VME time-to-digital converter with LEMO connectors