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LMX393HAUA+T Datasheet(PDF) 7 Page - Maxim Integrated Products |
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LMX393HAUA+T Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 9 page General-Purpose, Low-Voltage, Single/Dual/Quad, Tiny-Pack Comparators _______________________________________________________________________________________ 7 Detailed Description The LMX331/LMX393/LMX339 are single/dual/quad, low-cost, general-purpose comparators. They have a single-supply operating voltage of 1.8V to 5V. The com- mon-mode input range extends from -0.1V below the negative supply to within 0.7V of the positive supply. They require approximately 60µA per comparator with a 5V supply and 40µA with a 2.7V supply. The LMX331H/LMX393H/LMX339H have 2mV of hys- teresis for noise immunity. This significantly reduces the chance of output oscillations even with slow-moving input signals. The LMX331/LMX393/LMX339 and LMX331H/LMX393H/LMX339H are ideal for automotive applications because they operate from -40 °C to +125 °C (see Typical Operating Characteristics). Applications Information Hysteresis Many comparators oscillate in the linear region of oper- ation because of noise or undesired parasitic feed- back. This tends to occur when the voltage on one input is equal or very close to the voltage on the other input. The LMX331H/LMX393H/LMX339H have internal hysteresis to counter parasitic effects and noise. The hysteresis in a comparator 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 to move quickly past the other, thus taking the input out of the region where oscillation occurs. This provides clean output transitions for noisy, slow-moving input signals. Additional hysteresis can be generated with two resis- tors, using positive feedback (Figure 2). Use the follow- ing procedure to calculate resistor values: OUT IN- THRESHOLDS IN+ HYSTERESIS BAND VHYST VTL VTH Figure 1. Threshold Hysteresis Band (Not to Scale) PIN LMX331 LMX393 LMX339 NAME FUNCTION 1 — — IN+ Noninverting Input 2 4 12 VSS Negative Supply (Connect to GND) 3 — — IN- Inverting Input 4 — — OUT Comparator Output (Open-Drain) 5 83VDD Positive Supply — 1 2 OUTA Comparator A Output (Open-Drain) — 7 1 OUTB Comparator B Output (Open-Drain) — 2 4 INA- Comparator A Inverting Input — 3 5 INA+ Comparator A Noninverting Input — 5 7 INB+ Comparator B Noninverting Input — 6 6 INB- Comparator B Inverting Input — — 8 INC- Comparator C Inverting Input — — 9 INC+ Comparator C Noninverting Input — — 10 IND- Comparator D Inverting Input — — 11 IND+ Comparator D Noninverting Input — — 13 OUTD Comparator D Output (Open-Drain) — — 14 OUTC Comparator C Output (Open-Drain) Pin Description |
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