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ADCMP607BCPZ-R7 Datasheet(PDF) 11 Page - Analog Devices |
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ADCMP607BCPZ-R7 Datasheet(HTML) 11 Page - Analog Devices |
11 / 16 page ADCMP606/ADCMP607 Rev. A | Page 11 of 16 COMPARATOR PROPAGATION DELAY DISPERSION The ADCMP606/ADCMP607 comparators are designed to reduce propagation delay dispersion over a wide input overdrive range of 5 mV to VCCI − 1 V. Propagation delay dispersion is the variation in propagation delay that results from a change in the degree of overdrive or slew rate (that is, how far or how fast the input signal exceeds the switching threshold). Propagation delay dispersion is a specification that becomes important in high speed, time-critical applications, such as data communication, automatic test and measurement, and instru- mentation. It is also important in event-driven applications, such as pulse spectroscopy, nuclear instrumentation, and medical imaging. Dispersion is defined as the variation in propagation delay as the input overdrive conditions are changed (Figure 15 and Figure 16). The device dispersion is typically 2.3 ns as the overdrive varies from 10 mV to 125 mV. This specification applies to both positive and negative signals because each device has very closely matched delays for positive-going and negative-going inputs as well as very low output skews. Q/Q OUTPUT INPUT VOLTAGE 500mV OVERDRIVE 10mV OVERDRIVE DISPERSION VN ± VOS Figure 15. Propagation Delay—Overdrive Dispersion Q/Q OUTPUT INPUT VOLTAGE 10V/ns 1V/ns DISPERSION VN ± VOS Figure 16. Propagation Delay—Slew Rate Dispersion COMPARATOR HYSTERESIS The addition of hysteresis to a comparator is often desirable in a noisy environment, or when the differential input amplitudes are relatively small or slow moving. Figure 17 shows the transfer function for a comparator with hysteresis. As the input voltage approaches the threshold (0 V, in this example) from below the threshold region in a positive direction, the comparator switches from low to high when the input crosses +VH/2, and the new switching threshold becomes −VH/2. The comparator remains in the high state until the new threshold, −VH/2, is crossed from below the threshold region in a negative direction. In this manner, noise or feedback output signals centered on 0 V input cannot cause the comparator to switch states unless it exceeds the region bounded by ±VH/2. OUTPUT INPUT 0 VOL VOH +VH 2 –VH 2 Figure 17. Comparator Hysteresis Transfer Function The customary technique for introducing hysteresis into a comparator uses positive feedback from the output back to the input. One limitation of this approach is that the amount of hysteresis varies with the output logic levels, resulting in hysteresis that is not symmetric about the threshold. The external feedback network can also introduce significant parasitics that reduce high speed performance and induce oscillation in some cases. This ADCMP607 comparator offers a programmable hysteresis feature that can significantly improve accuracy and stability. Connecting an external pull-down resistor or a current source from the LE/HYS pin to GND, varies the amount of hysteresis in a predictable, stable manner. Leaving the LE/HYS pin discon- nected or driving this pin high removes hysteresis. The maximum hysteresis that can be applied using this pin is approximately 160 mV. Figure 18 illustrates typical hysteresis applied as a function of the external resistor value, and Figure 7 illustrates typical hysteresis as a function of the current. HYS RESISTOR (kΩ) 0 50 100 150 200 250 300 350 400 50 100 150 200 250 300 350 400 450 500 550 600 650 VCC = 2.5V Figure 18. Hysteresis vs. RHYS Control Resistor |
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