Highland V680 Time-to-Digital Converter VME Module

MODEL V680
VME 8-CHANNEL
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 ns after events
Jitter typically below 40 ps RMS
Ultrastable ovenized quartz crystal timebase
Optional custom internal microengine

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 ns 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.

Model V680 VME Time-to-Digital Converter Specification

CONFORMANCE	ANSI/IEEE 1014-1987 VMEbus specification. VXIC specification, Rev. 1.4.
DEVICE TYPE	Register based slave: A16:D16:D08(EO).
PACKAGING	Single-width, 6U VME, B-size VXI module.
POWER REQUIRED	+5: 2.8A max; +12: 1.1A max at startup, 600mA max after warm-up;-12: 1.4A max at startup, 800mA after warm-up
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 50 ohms) 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 50 ohms) 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 s) for bipolar mode.
JITTER	<(75ps + 2 E-9 x delay) RMS
LINEARITY	+-0.25 LSB
TIMEBASE	Internal ovenized crystal oscillator. Accuracy 0.01 ppm/deg C; aging < 1 ppm/year. Internal phase-lock-loop allows utilization of an external 10 MHz timebase.
INDICATORS	LEDs indicate module access and acquisition/ readout mode status.
CONNECTORS	Standard SMB; optional LEMO