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Search the history of over billion web pages on the Internet. Full text of ” IC Datasheet: They are also designed to operate over a wider range of supply voltages: Further, they can drive lamps or relays, switching voltages up to 50V at currents as high as 50 mA.
Both the inputs and the outputs of the LM, LM or the LM can be isolated from system ground, and the output can drive loads referred to ground, the positive supply or the negative supply. Offset balancing and strobe capability are provided and outputs can be wire OR’ed.
dataxheet Although slower than the LM and LM ns response time vs 40 ns the devices are also much less prone to spurious oscilla- tions. Do Not Ground Strobe Pin. Output is turned off when current is pulled from Strobe Pin. Increases typical common mode slew from 7. Detector for Magnetic Transducer r.
Typical input current is 50 pA with inputs strobed off. Pin connections shown on schematic diagram and typical applications are for H08 metal can package. The positive input voltage limit is 30V above the negative dataxheet.
The negative input voltage limit is equal to the negative supply voltage or 30V below the positive supply, whichever is less. The offset voltages and offset currents given are the maximum values required to drive the output within a volt of dataseet supply with a 1 mA load.
lm datasheet & applicatoin notes – Datasheet Archive
Thus, these parameters define an error band and take into account the worst-case effects of voltage gain and Rs- Note 8: The response time specified see definitions is for a mV input step with 5 mV overdrive.
This specification gives the range of current which must be drawn from the strobe pin to ensure the output is properly disabled. Do not short the strobe pin to ground; it should be current driven at 3 to 5 mA. Human body model, 1. Operating Ratings indicate conditions for which the device is functional, but do not guarantee specific performance limits. The offset voltages and offset currents given are the maximum values required to drive the output within a volt of either supply with 1 mA load.
Thus, these parameters define an error band and take into account the worst-case effects of voltage gain and Rs- Note However, when the input signal is a voltage ramp or a slow sine wave, or if the signal source impedance is high 1 kQ to kQthe comparator may burst into oscillation near the crossing-point.
This is due to the high gain and wide band- width of comparators like the LM To avoid oscillation or instability in such a usage, several precautions are recom- mended, as shown in Figure 1 below.
The trim pins pins 5 and 6 act as unwanted auxiliary dataaheet. If these datasheft are not connected to a trim-pot, they should be shorted together. If they are connected to a trim-pot, a 0. A smaller capacitor is used if pin 5 is used for positive feedback as in Figure 1.
Certain sources will produce a cleaner comparator out- put waveform if a pF to pF capacitor C2 is connected directly across the input pins. When the signal source is applied through a resistive network, R sit is usually advantageous to choose an R s ‘ of substantially the same value, both for DC and for dynamic AC considerations. Carbon, tin-oxide, and metal-film resistors have all been used successfully in comparator input circuitry. Inductive wirewound resistors are not suitable.
When comparator circuits use input resistors eg. In all cases the body of the resistor should be close to the device or socket.
lm111h datasheet pdf ibm
In other words there should be very little lead length or printed-circuit foil run between comparator and resistor to radiate or pick up signals. The same applies to capacitors, pots, etc.
Twisting these input leads tightly is the only second best alternative to placing resistors close to the comparator. Since feedback to almost any pin of a comparator can result in datashret, the printed-circuit layout should be engineered thoughtfully.
Preferably there should be a groundplane under the LM circuitry, for example, one side of a double-layer circuit card. Ground foil or, posi- tive supply or negative supply foil should extend datasheeet tween the output and the inputs, to act as a guard. The foil connections for the inputs should be as small and compact as possible, and should be essentially sur- rounded by ground foil on all sides, to guard against capacitive coupling from any high-level signals such as the output.
If pins 5 and 6 are not used, they should be shorted together. If they are connected to a trim-pot, the trim-pot should be located, at most, a few inches away from the LM, and the 0. If this capacitor cannot be used, a shielding printed-circuit foil may be advisable between pins 6 and 7. The power supply bypass capacitors should be lo- cated within a couple inches of the LM Some other comparators require the power-supply bypass to lj111h lo- cated immediately adjacent to the comparator.
It is a standard procedure to use hysteresis positive feedback around a comparator, to prevent oscillation, and to avoid excessive noise on the output because the comparator is a good amplifier for its own noise. In the circuit of Figure 2, the feedback from the output to the positive input will cause about 3 mV of hysteresis. How- ever, if R s is larger than Q, such as 50 kQ, it would not be reasonable to simply increase the value of the positive feedback resistor above kQ. The circuit of Figure 3 could be used, but it is rather awkward.
See the notes in paragraph 7 below. When both inputs of the LM are connected to active signals, or if a high-impedance signal is driving the positive input of the LM so that positive feedback would be disruptive, the circuit of Figure 1 is ideal. The positive feedback is to pin 5 one of the offset adjust- ment pins. It is sufficient datasheeet cause 1 to 2 mV hysteresis and sharp transitions with input triangle waves from a few Hz to hundreds of kHz. The positive-feedback signal across the 82Q resistor swings mV below the posi- tive supply.
Full text of “IC Datasheet: LM”
This signal is centered around the nominal voltage at pin 5, so this feedback does not add to the V os of the comparator. These application notes apply specifically to the LMLM, LM, and LF families of comparators, and are applicable to all high-speed comparators in general, with the exception that not all comparators have trim pins.
Conventional Positive Feedback 11 www. Positive Feedback with High Source Resistance 9. R3 50K R1 3. Om111h comparison, the photodiode has less than 5 mV across it, decreasing leakages by an order of magnitude. Pin connections shown on dtaasheet diagram are for H08 package. For the most current product datsaheet visit us at www. Life support devices or systems are devices or systems which, a are intended for dataaheet implant into the body, or b support or sustain life, and whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user.
A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.