What is LM709 Operational Amplifier?

Hi students welcome to the new learning post. in this tutorial, we will learn LM709. The LM709 series consists of a monolithic Op-AMP that are used in different electronic projects and devices. Their working range is mentioned at their casing and features as well. Their structure is such that offered a large value of gain with decreases the value of offset v olts and biased curent.

We will know about the pinout, working, features, and other related facts about this module so lets get started..

What is operational amplifier?

• The operational amplifier is IC that is used for the amplification of weak signals to strong of high-value signals.
• It has two inputs and one output input. Its main work is to amplify the voltage difference between two inputs

What is a transistor?

• A transistor is a device that converts an electrical signal to a voltage that can be applied to a load. A transistor can be thought of as an electronic switch that produces a particular output voltage when the transistor is in the ON state.
• On the other hand, the transistor can be turned ON and off very quickly, so that the output voltage output depends on how much current flows through the gate.

LM709 Operational Amplifier

• The LM709 is a monolithic operational amplifier used for performing general operations. The working is defined for different ranges of voltage used for this device.
• It provides high gain and reduces both offset voltage and biased current. With that Class B output stage provides larger output features with less power drain
• There are external components used for frequent compensation of amplifiers.
• The unity of gain compensates system defined make amplifies unconditionally stable for feedback designs
• It is a monolithic operational amplifier that has features to work for a voltage range of ±4.75V to ±70V and comes with rail-to-rail output swing and  Low Input Bias Current.
• Though monolithic operational amplifiers were first time used in the 1960s and still they are in use.

 

LM709 Operational Amplifier Pinout

• Pin 1 Input A: It used for frequency compensation
• Pin2: it provdie inverting input voltage
• Pin3: it used for non-inverting input voltage
• Pin4: it is used to provide a negative DC supply
• Pin5: It used for output frequency compensate
• Pin 6: This pin is used for getting an output voltage
• Pin7: It is used for DC supply connection Vcc
• Pin: It is also compensation pins at input B

LM709 Op-Amp Features

Features	LM 709
Input offset voltage	5 (mV)
Input bias current	500(nA)
Slew rate	2.5(V/ µs)
Input resistance	150 (Ω)
Supply voltage rejection ratio	150 (µV/V)
Supply Voltage	±18 (V)
Power dissipation	300 (mW)
Differential Input voltage	±5 (V)
Output short circuit duration	5(s)
Lead temperature	300 (°C)
Junction temperature	-55 to +150(°C)
voltage rejection ratio	150(V/ µV)
voltage gain	70(V/mV)
Supply current	5.5(mA)
Common mode rejection ratio	90(dB)
Input offset current	200 (nA)
Maximum output voltage swing	±14 (V)

How to Use LM709 

As the LM709 is a single operational IC voltage at non-inverting input is larger as compared to voltage for inverting input. So the output of the comparator is HIGH.

If the voltage of the inverting input is higher than non inverting pin then the output is LOW. The output of operational amplifiers is multiple of gain and input voltage.

LM709 comes with input and output compensation pins used for handling frequency problems

Benefits of LM709 IC

• It has less input current value
• It has high gaoin
• It produces low noises at time of working for high impedance circuit
• it comes with overload protection features

Applications of LM709 IC

• mobile phones for AD conversion.
• Audio amplifiers.
• PLC controllers
• Video signal conditioning units.
• Processors circuits
• FET  amplifier
• voltage follower
• Unity gain inverting amplifier
• bilateral current source
• AC/DC converter
• Digital and Analog electronics
• Power Supplies and Mobile Chargers
• Desktop PC and Motherboard
• UPS
• Mathematical operations
• sine wave generator
• voltage comparator
• Power supplies
• oscillators
• half-wave rectifiers
• Sensor Data Accusation.
• Digital to analog converters in Phones.
• Temperature sensors and controllers.
• Error amplifiers.
• Communication circuits.
• Mobile phone chargers.
• Receivers.
• Modulators.
• Synthesizers.
• Amplifiers
• Oscillators
• Voltage Comparators
• Washers, Dryers, and Refrigerators
• Programmable Logic Controllers
• Measuring instruments
• instrumentation amplifier