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MAX962ESA Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX962ESA Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 14 page Single/Dual/Quad, Ultra-High-Speed, +3V/+5V, Beyond-the-Rails Comparators _______________________________________________________________________________________ 7 _______________Detailed Description The MAX961–MAX964/MAX997/MAX999 single-supply comparators feature internal hysteresis, ultra-high- speed operation, and low power consumption. Their outputs are guaranteed to pull within 0.52V of either rail without external pullup or pulldown circuitry. Beyond- the-Rails input voltage range and low-voltage, single- supply operation make these devices ideal for portable equipment. These comparators all interface directly to CMOS logic. Timing Most high-speed comparators oscillate in the linear region because of noise or undesirable parasitic feed- back. This can occur when the voltage on one input is close to or equal to the voltage on the other input. These devices have a small amount of internal hystere- sis to counter parasitic effects and noise. The added hysteresis of the MAX961–MAX964/MAX997/ MAX999 creates two trip points: one for the rising input voltage and one for the falling input voltage (Figure 1). The difference between the trip points is the hysteresis. When the comparator’s input voltages are equal, the hysteresis effectively causes one comparator input voltage to move quickly past the other, thus taking the input out of the region where oscillation occurs. Standard comparators require hysteresis to be added with external resistors. The fixed internal hysteresis eliminates these resistors. The MAX961/MAX963 include internal latches that allow storage of comparison results. LE has a high input impedance. If LE is low, the latch is transparent (i.e., the comparator operates as though the latch is not pre- sent). The comparator’s output state is stored when LE is pulled high. All timing constraints must be met when using the latch function (Figure 2). Input Stage Circuitry The MAX961–MAX964/MAX997/MAX999 include inter- nal protection circuitry that prevents damage to the pre- cision input stage from large differential input voltages. This protection circuitry consists of two groups of three front-to-back diodes between IN+ and IN-, as well as two 200Ω resistors (Figure 3). The diodes limit the dif- ferential voltage applied to the comparator’s internal circuitry to no more than 3VF, where VF is the diode’s forward-voltage drop (about 0.7V at +25°C). Q VOL VOH VTRIP+ VHYST VTRIP- Q VOL VOH VTRIP+ + VTRIP- 2 VOS = VIN- = 0V VIN+ Figure 1. Input and Output Waveforms, Noninverting Input Varied |
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