LT1116 TiMing DiagraM VOD LATCH ENABLE tSU tH ∆V V IN IN VIN tPD tPD VOUT VOUT LT1116 • TD01 LT1116 • TD02 applicaTions inForMaTion Common Mode Considerations com mon mode range. When input signals fall below the The LT1116 is specified for a common mode range of negative common mode limit, the internal PN diode formed 0V to 2.5V with a single 5V supply, and –5V to 2.5V with with the substrate can turn on (resulting in significant ±5V supplies. The common mode range is defined as the charge flow throughout the die). A Schottky clamp diode, DC input for which the output responds correctly to small between the input and the negative rail, speeds up recovery changes in the input differential. Input signals can exceed from negative overdrive by preventing the substrate diode the positive common mode limit up to the 15V absolute from turning on. The zero crossing detector in Figure 1 maximum rating without damaging the comparator. There demonstrates the use of a fast clamp diode. Recovery, will, however, be an increase in propagation delay of up from 500mV overdrive below V–, for this circuit is ap- to 10ns when the input signal switches back into the proximately 18ns. Fast Zero Crossing Detector 5V RS CABLE 50 V + Q IN R 1N5712 T LT1116 50Ω – Q LT1116 • AI01 Figure 1. The Zero Crossing Detector Terminates the Transmission Line at Its 50Ω CharacteristicImpedance. Negative Inputs Should Not Fall Below –2V to Keep the Signal Current Within theClamp Diode’s Maximum Forward Rating. Positive Inputs Should not Exceed the Device’s AbsoluteMaximum Ratings nor the Power Rating on the Terminating Resistor 1116fc 6 For more information www.linear.com/LT1116
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