## How does a LM339 work?

The LM339 is a quad op amp comparator. A comparator works by a simple concept. Each op amp of a comparator has 2 inputs, a inverting input and a noninverting input. If the inverting input voltage is greater than the noninverting input, then the output is drawn to ground.

Table of Contents

## How does a LM339 work?

The LM339 is a quad op amp comparator. A comparator works by a simple concept. Each op amp of a comparator has 2 inputs, a inverting input and a noninverting input. If the inverting input voltage is greater than the noninverting input, then the output is drawn to ground.

What is comparator LM339?

LM339 is a quad differential comparator IC in which four independent voltage comparators reside inside a single 14- lead package. As it is a comparator IC, therefore it compares the two input values and generates the output depending on the comparison.

What is IC 339?

The IC 339, also popularly written as LM339, is a quad comparator IC. Meaning, it includes 4 separate voltage comparators whose inputs and outputs are appropriately terminated via the respective external pins of the IC package, as shown below.

### What is the difference between LM324 and LM339?

The LM324 has a complementary output while the LM339 is open collector. In the complementary output, current can flow in either direction as required (either source or sink) while the open collector output can only sink current.

How do op amp comparators work?

The open-loop op-amp comparator is an analogue circuit that operates in its non-linear region as changes in the two analogue inputs, V+ and V- causes it to behave like a digital bistable device as triggering causes it to have two possible output states, +Vcc or -Vcc.

How does a window comparator work?

A window comparator is a circuit that operates within a certain frame, or window, of voltage. Normally how a voltage comparator works when by itself is that when the voltage rises above a certain level at the inverting terminal, the output turns on. Any voltage above this reference level keeps the output on.

#### How does a comparator work?

A comparator circuit compares two voltages and outputs either a 1 (the voltage at the plus side) or a 0 (the voltage at the negative side) to indicate which is larger. Comparators are often used, for example, to check whether an input has reached some predetermined value.

What is the difference between a comparator and an op amp?

Unlike operational amplifiers that usually operate with the input voltages at the same level, comparators typically see large differential voltage swings at their inputs. But some comparators without rail-to-rail inputs are specified to have a limited common mode input voltage range.

What is LM358 IC?

The LM358 IC is a great, low power and easy to use dual channel op-amp IC. It is designed and introduced by national semiconductor. It consists of two internally frequency compensated, high gain, independent op-amps. This IC is designed for specially to operate from a single power supply over a wide range of voltages.

## How many comparators does 339 IC have?

4
Exercise :: Linear-Digital ICs – General Questions

25. How many comparators does a 339 IC contain?
A. 4 B. 3 C. 2 D. 1 Answer: Option A Explanation: No answer description available for this question. Let us discuss. Workspace Report errors Name : Email: View Answer Discuss

Is lm339 open collector?

The output is an open collector, and there is a pull-up to 5V, meaning that when the non-inverting input is higher than the inverting input the output transistor is OFF, and the output will go to whatever voltage the pull-up (Rp) is connected to.

What is the difference between LM324 and LM324N?

LM324 has the same function as LM324N, The difference between the two is that the LM324 does not specify the package form, and the LM324N package is a plastic dual in-line package. N suffix refers to the packaging: N is DIP.

### What is the main applications of comparator?

A comparator consists of a specialized high-gain differential amplifier. They are commonly used in devices that measure and digitize analog signals, such as analog-to-digital converters (ADCs), as well as relaxation oscillators.

What is the difference between an op-amp and a comparator?

At the output, ordinary op amps use push-pull output circuitry for essentially symmetrical swings between the specified power supply voltages, while comparators usually have an “open-collector” output with grounded emitter.

Why comparators are used?

#### What is a zero crossing detector?

The zero crossing detector circuit changes the comparator’s output state when the AC input crosses the zero reference voltage. This is done by setting the comparator inverting input to the zero reference voltage and applying the attenuated input to the noninverting input.

What are comparators used for?

A comparator is used to compare a measurable quantity with a reference or standard such as two voltages or currents. It outputs a digital signal showing the results.

How does LM339 IC work?

LM339 IC compares the values of two inputs against each other. When the AC signal crosses the zero-reference voltage, the output of comparator changes. The diode protects the chip from damage when the input voltage goes below the range specified for common-mode input voltage.

## How can I use LM339 as a comparator circuit?

Using LM339 can easily form various voltage comparator circuits and oscillator circuits. Figure (a) shows a basic single limit comparator. Add the input signal UIN (i.e. voltage to be compared) to the in-phase input terminal, and connect a reference voltage Ur at the anti-phase input terminal.

How many pins are there in LM339?

LM 339 has fourteen (14) pins in total including four inverting input pins, four non inverting pins, four output pins, voltage and ground pin. All of the pins along with their sequence number are shown in the table given below. 2. LM339 Pins Configuration

What is the quiescent current drain of LM339?

The quiescent current drain of the IC is incredibly low (generally under 1 mA) and it is not dependent on the supply voltage input. The input voltage supplied to the input pins of the IC LM339 could be as high as the supply voltage.