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AD9500BP Datasheet(PDF) 8 Page - Analog Devices |
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AD9500BP Datasheet(HTML) 8 Page - Analog Devices |
8 / 11 page AD9500 –8– REV. D APPLICATIONS The AD9500 is a very versatile device that is not difficult to use. Essentially there are only a few basic configurations which can be extended into a number of applications. The TRIGGER and RESET inputs of the AD9500 can be treated as single ended, or as differential, which allows the AD9500 to operate with a wide range of signal sources. The output pulse from the AD9500 can be reset in one of two ways, either immediately by driving the RESET inputs with the output itself, or in a delayed mode. MINIMUM CONFIGURATION The minimum configuration uses only one of the TRIGGER inputs. The other is connected to the ECL reference midpoint, ECLREF. This allows the AD9500 to be triggered with standard 10K or 10KH ECL signals. Once a triggering event occurs, the Q output will go into the logic HIGH state, and the Q output will go into the logic LOW state after the programmed delay. The Q output is then used to drive the RESET input, causing the AD9500 to reset itself. The result is a delayed output pulse which is only as wide as the reset propagation delay (tRD). Figure 5. Single Input–Minimum Timing Configuration EXTENDED OUTPUT PULSEWIDTHS The extended pulse configuration is similar to the minimum configuration. The difference here is that the output pulsewidth has been extended. Operation is identical in terms of triggering the AD9500; the functional difference is in the resetting circuit. In this case the Q R output is used to drive the RESET input through a resistor/capacitor charging network. The charging network will cause the signal at the RESET input to fall more slowly, which will extend the output pulsewidth. An added benefit of the extended pulsewidth configurations is that both the Q and the Q outputs are completely free for other uses. Q has limited current drive; the minimum resistance for RD should be 4 k Ω. Figure 6. Extended Output Pulsewidth Configuration MULTICHANNEL DESKEWING Perhaps the most appropriate use of the AD9500 is in multiple delay matching applications. Slight differences in impedance and cable length can create large timing skews within a high- speed system. Much of this skew can be eliminated by running each signal through an AD9500. With one line used as a stan- dard, the programmed delays of the other AD9500s are adjusted to eliminate the timing skews. With the very fine timing adjust- ments possible from the AD9500 (as small as 10 ps), nearly any high-speed system should be able to automatically adjust itself to extremely tight tolerances. Figure 7. Multiple Delay Matching |
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