Download TTM8000 - Roithner Lasertechnik

Introduction:
The 8-channel Time Tagging Module TTM8000 can be used to measure the timing of digital events (rising
and/or falling edges) with high to extremely high resolution (depending on the chosen measurement mode)
on up to 8 digital signals for a wide range of logic families.
What is a TTM8000?
A TTM8000 is an electronic device, that can be used to measure the timing of electronic pulses on up to
eight external digital inputs with high resolution.
While the actual technical solution is slightly different, we can think of the TTM8000 as a counter that is
incremented at a very high, constant rate (forming a clock with high resolution). The TTM8000 constantly
monitors the levels on all the external inputs and when it detects a transition (low-to-high or high-to-low) on
any input it records the number of the input, the direction of the transition and the current value of the high
resolution clock in an event table inside the TTM8000. The contents of this event table is then sent via
standard Gigabit- Ethernet (UDP/IP) to a connected PC (Windows/Linux/Mac) where the events are then
processed by suitable software (e.g. to detect patterns in the recorded events).
While it is possible to record all edges on all eight inputs, it is not mandatory to do so. The TTM8000 can be
fully configured to record only selected edges for selected inputs, thus drastically reducing the number of
entries in the event table (and thus drastically reducing the effort needed to process the table). Furthermore
the definition of high- and low-signal levels can be configured individually for each external input to directly
process signals from many different logic families.
The TTM8000 supports several measurement modes. The most popular I-Mode supports 8 external inputs
with rising and falling edges at a resolution of 82.3045ps (1/12.15GHz) and an 'infinite' measurement time.
Other modes (G/R/M) provide finer time resolution (2 x 12.15GHz for G-Mode / 3 x 12.15GHz for R-Mode /
3n x 12.15GHz for M-Mode (n < 31)) but support only 2 external inputs and have a limited measurement time
for each measurement (Note: Several measurement can follow each other without gap. Thus the total
measurement time is still unlimited, however the event timestamps from different measurements can not
easily be combined). The detailed features of each mode are explained in the “Key features” section below.
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TTM8000