LMN Datasheet, LMN National Semiconductor Voltage Comparator Datasheet, buy LMN. The LM, LM, LM are voltage comparators that have low input currents. They are also designed to operate over a wide range of. Part, LMN. Category. Description, Voltage Comparators. Company, ST Microelectronics, Inc. Datasheet, Download LMN datasheet. Cross ref.
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Normally these pins are not used since the Input Offset itself is much better controlled. Submitted by admin on 6 March The LM can work on a Single supply voltage or in a dual supply mode. The output is correct as seen on the scope.
Attached is a Multisim file with every comparator with a strobe feature available in Multisim and a picture of datasheer circuit. According to the datasheet, if you tie the strobe pin to GND then the output should be disabled.
Could the component model be the issue? Why is it not working in Multisim? If the voltage at the Non-Inverting Terminal pin 2 is higher than the Inverting Terminal pin 2the output pin 7 will also be high else the output will be low.
I built a simple circuit using the LMN comparator. Datasheft problem is that tying the strobe pin to ground should make the output stop changing, and it isn’t.
LMN Datasheet pdf – Single Comparator – Fairchild Semiconductor
As grounding unused pins is a practice on electronics, I guess it was the way of the designer to make sure the device was not disabled for a ground wired to that pin. All of those comparator outputs should be a high state which means the LED will turn on connected through the 1K resistor to Vcc.
An Emitter Output Circuit is shown below. I just built the circuit in real life lm311 it works exactly as I thought, putting GND on the strobe pin makes the output a constant state at Vcci. I tried adding in a transistor with a 1k resistor to ground and a TTL signal at the base as per the datasheet and this doesn’t disable the output either. When not in use dztasheet pins 5 and 6 should be shorted as shown xatasheet. This pin is connected to the ground of the system Negative voltage can also be used.
A sample circuit is shown below in which the Inverting Terminal is set to 2. Message 3 of 5.
Multisim and Ultiboard
LMN Comparator with Strobe. The pins 5 and 6 on the Op-amp are used to set the balance voltage if you want to manually adjust the DC-Offset voltage.
Any help is appreciated. Message datadheet of 5. You can note that the Output voltage stays high when pin 2 has higher voltage than pin 7 and vice versa. TL — Programmable Reference Voltage. The problem is that the strobe pin is not working for the model. Most Active Software Boards: Message 4 of 5. You can refer the other possible circuits from the LM datasheet given at bottom. Message 5 of 5. I expect the output to oscillate between 0 and 1 at the “zero crossing” of the signal.
The simplified schematics of the IC is shown below:.
The transistor can also make the Load to be isolated from the system ground, so if you are looking for a Voltage comparator to drive loads of these specifications then this IC might be the right choice for you. The simplified schematics of the IC is shown below: Any Op-Amp can be made to work as a voltage comparator, but the LM proves itself to be advantages by housing an Output Transistor inside its package.