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TLV3011AIDCKT Datasheet(PDF) 8 Page - Burr-Brown (TI) |
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TLV3011AIDCKT Datasheet(HTML) 8 Page - Burr-Brown (TI) |
8 / 13 page TLV3011, TLV3012 SBOS300B 8 www.ti.com FIGURE 3. TLV3011 Configured as a Low Battery Level Detector. APPLICATIONS INFORMATION The TLV3011 is a low-power, open-drain comparator with on-chip 1.242V series reference. The open-drain output allows multiple devices to be driven by a single pull-up resistor to accomplish an OR function, making the TLV3011 useful for logic applications. The TLV3012 comparator with on-chip 1.242V series refer- ence has a push-pull output stage optimal for reduced power budget applications and features no shoot-through current. A typical supply current of 2.8 µA and tiny packaging combine with 1.8V supply requirements to make the TLV3011 and TLV3012 optimal for battery and portable designs. BOARD LAYOUT Typical connections for the TLV3011 and TLV3012 are shown in Figure 1. The TLV3011 is an open-drain output device. A pull-up resistor must be connected between the comparator output and supply to enable operation. To minimize supply noise, power supplies should be capaci- tively decoupled by a 0.01 µF ceramic capacitor in parallel with a 10 µF electrolytic capacitor. Comparators are sensitive to input noise, and precautions such as proper grounding (use of ground plane), supply bypassing, and guarding of high-impedance nodes will minimize the effects of noise and help to ensure specified performance. FIGURE 1. Basic Connections of the TLV3011 and TLV3012. FIGURE 2. Adding Hysteresis. may be added by connecting a small amount of feedback to the positive input. Figure 2 shows a typical topology used to introduce hysteresis, described by the equation: V VR RR HYST = × + + 1 12 V IN– V IN+ V OUT 0.01 µF 10 µF R PULL-UP (1) 10k Ω V+ 4 3 5 REF 2 V– 1 6 TLV301x NOTE: (1) Use R PULL-UP with the TLV3011 only. OPEN-DRAIN OUTPUT (TLV3011) The open-drain output of the TLV3011 is useful in logic applications. The value of the pull-up resistor and supply voltage used will affect current consumption due to additional current drawn when the output is in a low state. This effect can be seen in the typical curve Quiescent Current vs Output Switching Frequency. EXTERNAL HYSTERESIS Comparator inputs have no noise immunity within the range of specified offset voltage ( ±12mV). For noisy input signals, the comparator output may display multiple switching as input signals move through the switching threshold. The typical comparator threshold of the TLV3011 and TLV3012 is ±0.5mV. To prevent multiple switching within the comparator threshold of the TLV3011 or TLV3012, external hysteresis VHYST will set the value of the transition voltage required to switch the comparator output by increasing the threshold region, thereby reducing sensitivity to noise. APPLICATIONS BATTERY LEVEL DETECT The low power consumption and 1.8V supply voltage of the TLV3011 make it an excellent candidate for battery-powered applications. Figure 3 shows the TLV3011 configured as a low battery level detector for a 3V battery. Battery Okay Trip Voltage RR R −= + 1 242 2 12 . TLV301x V IN V OUT R PULL-UP (1) V+ 5.0V V REF R 1 39k Ω R 2 560k Ω REF V HYST = 0.38V NOTE: (1) Use R PULL-UP with the TLV3011 only. Battery Okay R 1 1M Ω R 2 2M Ω R PULL-UP (1) TLV301x When the battery voltage drops below 1.9V, the battery-okay output will go low. NOTE: (1) Use R PULL-UP with the TLV3011 only. REF 1.242V + − |
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Similar Description - TLV3011AIDCKT |
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