THS789 Datasheet, PDF (32/34 Pages) Texas Instruments – THS789 Quad-Channel Time Measurement Unit (TMU)

THS789
SLOS776A – SEPTEMBER 2012 – REVISED DECEMBER 2015
Layout Example (continued)
0.1-µF and 0.01-µF
decoupling
capacitor pairs for
each VCC pin
100- resistors are as close
as possible to the device
before vias to the top side to
tie to appropriate pins
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Figure 16. Bottom (Signal Termination and Power Decoupling) Layer Example
10.3 Thermal Considerations
The TMU package provides a thermally conductive heat slug at the top for connection to an additional heatsink.
The TMU can be placed into many different modes for optimization of performance versus power dissipation, and
a table has been provided to help determine the power required. The heat sink should be carefully considered in
order to keep the TMU temperature within required limits and to promote the best temperature stability. The TMU
time measurement drift with temperature is an excellent 0.1 ps/°C. A good heat sink design takes advantage of
the low temperature drift of the TMU.
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