LM709 Operational Amplifier Pinout and Examples

The LM709 series is a monolithic operational amplifier designed for general-purpose applications. The range of voltages commonly used for these devices is completely satisfied by the specifications of LM709. It specializes in providing high gain and reducing both offset voltage as well as bias currents. The class-B output stage provides a significant output potentiality in parallel with a reduced power drain. Frequency compensation of the amplifier is achieved by the use of external components.

Keeping in view all feedback configurations, the amplifier is unconditionally stable for the circuits specified for unity gain compensation. But this compensation can be altered or adjusted to have specific gain values with regard to optimization of performance at high frequencies. The commercial variant of LM709 is LM709C. This variant differs LM709 just in its operation from temperature range from zero Celsius to seventy degrees Celsius.

LM709 Pinout Details

LM709 pin configuration diagram

The dual inline packages of LM709C come as either 8 or 14 pin variant. The pinouts for 8 pin DIP is shown as:

LM709 pinout diagram op amp

PINSDetails
1 ( Compensation Input-A)This pin is for input frequency compensation
2 ( Inverting Input)This pin for applying the inverting input voltage
3 (Non-Inverting Input)This pin is for applying a non-inverting input voltage
4 (-Vcc)This pin is for applying negative DC supply
5 (Compensation Output)This pin is for output frequency compensation
6 (Output)This pin is for obtaining an output voltage
7 (+Vcc)This pin is for applying positive DC supply
8 (Compensation input-B)This pin is for compensation

LM709 Different packages

The 14 pins package housing single LM709 OP-AMP has the pins/ functions the same as the 8 pin package. The only difference is of pin numbers. The 8 pin package is compact and easy to handle. 14 pin package is depicted as:

14 pin package

Another available package, apart from DIL packages i.e. 8 and 14 pins, is a metal can package.

 metal can package

LM709 Op-Amp Features

The operational features of LM709, LM709A and the commercial variant LM709C are shown as:

ParametersLM 709LM 709ALM 709C
Input offset voltage (mV)527.5
Input bias current (nA)5002001500
Slew rate as inverting amplifier (V/ µs)2.52.52.5
Supply voltage rejection ratio (V/ µV)150100200
Large signal voltage gain (V/mV)707045
Supply  current (mA)5.53.66.6
Common mode rejection ratio (dB)9011090
Input offset current (nA)20050500
Maximum output voltage swing (V)±14±14±14
Input resistance (Ω)150150150
Supply voltage rejection ratio (µV/V)150100200
Supply Voltage (V)±18±18±18
Power dissipation (mW)300250250
Differential Input voltage (V)±5±5±5
Output short circuit duration (s)555
Lead temperature (Soldering, 10s) (°C)300300300
Junction temperature (°C)-55 to +150-55 to +1500 to +100

DataSheet

Download LM709 DataSheet

Where and How to Use LM709 Operational Amplifier

While using LM709 operational amplifier input signal is either applied at inverting or non-inverting input terminals i.e. pin no. 2 or 3. DC supply voltage ranging is applied on pin no. 4 & 7 in such a way that the negative potential of the battery is connected to pin 4 while positive to pin 7. It should be noted that +Vcc and –Vcc must be equal in magnitude. The maximum values of ±Vcc are shown in the table showing features or datasheet. The output voltage is obtained at pin 6. Pin 1, 5 and 8 are used for input and output frequency compensations. Specific circuit configurations are there to make standard frequency compensations for input and output as well as offset balancing. One such configuration is shown as:

LM709 Examples

LM 201 can be used for the construction of:

LM709 Examples

Unity Gain Inverter Example

One of the uses of OP-AMP is a unity gain amplifier. The unity gain amplifiers can come up as followers or inverter. The follower provides a gain of one with output exactly the same as the input. The inverter, however, reverses the polarity of input in addition to unity gain provision. LM 709 can be used as a follower and inverter as shown below.

Unity Gain Inverter example Using LM709

Unity Gain Inverter Using LM 709

Unity gain Follower example using LM709

Unity gain Follower

 

LM709 Applications

The real-life applications of LM709 are:

  • on our mobile phones for AD conversion
  • In Audio amplifiers
  • Programmable logic controllers
  • Video signal conditioning units
  • Processors
  • Sensor Data Accusation
  • digital to analog converters in Phone
  • Temperature sensors and controllers
  • error amplifiers
  • communication circuits
  • Mobile phone chargers
  • Receivers
  • Modulators
  • Synthesizers

2D Dimension Model

This picture shows the 2D model for the 8 pin DIP package.

2D Dimension Model

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