LM111H DATASHEET PDF

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At comparison, the photodiode has less than 5 mV across it, decreasing leakages by an order of magnitude. Although slower than the LM and LM ns response time vs 40 ns the devices are also much less prone to spurious oscilla- tions. A smaller capacitor is used if pin 5 is used for positive feedback as in Figure 1. 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 LM series has the same pin configuration as the iA series.

LM111H/883

Some lm111h comparators require the power-supply bypass to be located immediately adjacent to the. 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. To avoid oscillation or instability in such a usage, several. Offset balancing and strobe capability are provided and outputs can be wire OR’ed. Some other comparators require the power-supply bypass to be lo- cated immediately adjacent to the comparator.

LM zero crossing detector Abstract: Fatasheet connections shown on schematic diagram and typical applications are for H08 metal can package. Search the history of over billion web pages on the Internet. The circuit of Figure 3 could be used, but datasheey is rather awkward.

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These application notes apply ratasheet to the LMLM, LM, and Xatasheet families of comparators, and are applicable to all high-speed comparators in general, with the exception that not all comparators have trim pins. This is due to the high gain and wide bandwidth of comparators like the LM If these pins lm111j not connected to a trim-pot, they should be shorted together. Ground foil or, posi- tive supply or negative supply foil should extend be- tween the output and the inputs, to act as a guard.

The power supply bypass capacitors should be located within a couple inches of the LM This specification gives the range of current which must be drawn from daatsheet strobe pin to ensure the output is properly disabled.

For the most current product information visit us at www. See the notes in paragraph 7 below. Some othercrossing-point. Try Findchips PRO for lm In all cases the body of the resistor should be close to the device or socket. The negative input voltage limit is equal to the negative supply voltage or 30V below the positive supply, whichever is less.

When the signal source is applied through a resistive network, R sit is dataaheet advantageous to choose an R s ‘ of substantially the same value, both for DC and for dynamic AC considerations. In the circuit of Figure 2, the feedback from the output to the positive input will cause about 3 mV of hysteresis.

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Fixed; Input Voltage Min: The power supply bypass capacitors should be lo- cated within a couple inches of the LM The output can also switch voltages to 50 V at currents to 50 mA. The response time specified see definitions is for a mV input step with 5 mV overdrive. Increases typical common mode slew from 7. This is due to the high gain and wide band width of comparators like the LM Positive Feedback with High Source Resistance 9.

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It is sufficient to cause 1 to 2 mV hysteresis and sharp transitions with input triangle waves from a few Hz to hundreds of kHz. Do not short the strobe pin to ground; it should be current driven at 3 to 5 mA.

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The positive-feedback signal across the 82Q resistor swings mV below the posi- tive supply. They are also designed to operate over a wider range of supply voltages: Chip One Exchange 2.

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. If pins 5 and 6 are not used, they should be shorted together. The same applies to capacitors, pots, etc. If they are connected to a trim-pot, a 0. If this daatsheet cannot be used, a shielding printed-circuit foil may be advisable between pins 6 and 7.

No abstract text available Text: Twisting these input leads tightly is the only second best alternative to placing resistors close to the comparator. In other words there should be very little lead length or printed-circuit foil run between comparator and resistor to dwtasheet or pick up signals. 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.