AD96687

a FEATURES Fast: 2.5 ns Propagation Delay Low Power: 118 mW per Comparator Packages: DIP, SOIC, PLCC Power Supplies: +5 V, –5.2 V Logic Compatibility: ECL 50 ps Delay Dispersion APPLICATIONS High Speed Triggers High Speed Line Receivers Threshold Detectors Window Comparators Peak Detectors Ultrafast Comparators AD96685/AD96687 AD96685 FUNCTIONAL BLOCK DIAGRAM NONINVERTING INPUT INVERTING INPUT Q OUTPUT Q OUTPUT RL RL LATCH ENABLE VT AD96687 FUNCTIONAL BLOCK DIAGRAM NONINVERTING INPUT Q OUTPUT Q OUTPUT NONINVERTING INPUT Q OUTPUT Q OUTPUT INVERTING INPUT RL RL RL RL INVERTING INPUT LE LE LE LE LATCH VT LATCH ENABLE ENABLE THE OUTPUTS ARE OPEN EMITTERS, REQUIRING EXTERNAL PULL-DOWN RESISTORS.THESE RESISTORS MAY BE IN THE RANGE OF 50⍀-200⍀ CONNECTED TO –2.0V, OR 200⍀-2000⍀ GENERAL DESCRIPTION The AD96685 and AD96687 are ultrafast voltage comparators. The AD96685 is a single comparator with 2.5 ns propagation delay; the AD96687 is an equally fast dual comparator. Both devices feature 50 ps propagation delay dispersion which is a particularly important characteristic of high-speed comparators. It is a measure of the difference in propagation delay under differing overdrive conditions. A fast, high precision differential input stage permits consistent propagation delay with a wide variety of signals in the commonmode range from –2.5 V to +5 V. Outputs are complementary digital signals fully compatible with ECL 10 K and 10 KH logic families. The outputs provid...