LM3900 Norton Op Amp: Circuit, Pinout, and Datasheet

The LM3900 is designed to work in temperatures ranging from 0 to 70 degrees Celsius. These devices are made up of four independent, highgain frequency-compensated Norton operational amplifiers that were designed to operate over a wide variety of voltages from a single source. It's also feasible to run on split supplies. The amount of the supply voltage has little effect on the low supply current drain. These devices have a big output voltage swing and a wide bandwidth.

The following is LM3900 Pinout.

Pinout

The LM3900 CAD Model is shown as follows.

Symbol

Footprint

3D Model

• Wide Range of Supply Voltages, Single or Dual Supplies

• Wide Bandwidth

• Large Output Voltage Swing 

• Output Short-Circuit Protection 

• Internal Frequency Compensation 

• Low Input Bias Current

• Designed to Be Interchangeable With National Semiconductor LM2900 and LM3900, Respectively

• Wide Single Supply Voltage  4 VDC to 32 VDC

• Range or Dual Supplies g2 VDC to g16 VDC

• Supply Current Drain Independent of Supply Voltage

• Low Input Biasing Current 30 nA

• High Open-loop Gain  70 dB

• Wide Bandwidth 2.5 MHz (Unity Gain)

• Large Output Voltage Swing (Va b 1) Vp-p

• Internally Frequency Compensated for Unity Gain

• Output Short-circuit Protection

The LM3900 Symbol (Each Amplifier) is shown as follows.

Symbol (Each Amplifier)

The following shows LM3900 Schematic (Each Amplifier).

Schematic (Each Amplifier)

The circuit for a simple multi-channel audio mixer using the LM3900 quad amplifier is shown below. The circuit is made up of four quad amplifier channels (LM3900). This circuit features two mic audio inputs and two direct line inputs. You can increase the number of inputs by adding the same circuit in parallel with this, depending on the uses. Each input is connected to the LM3900's inverting terminal. Each section's built-in amplifier amplifies each audio input separately and feeds it to the output terminal s. Each channel's output terminal is connected to a single output line with a resistance of no more than 680K, resulting in a mixed audio output with very low noise. To combine optimal sources, this audio mixer circuit does not use a low impedance input. The decoupling capacitors for the corresponding channels are capacitors C1 through C4. The output decoupling capacitor is C5.

Multi-Channel Audio Mixer Circuit

The main features of this audio mixer circuit as compared to the other audio mixers are given below.

1) Wide range of supply voltage input (4volt to 32volt)

2) Dual voltage supplies also adoptable (+/- 2.2volt to +/-16volt)

3) Low input biasing current(30nA)

4) Providing very high open loop gain(70dB)

5) Output short circuit protection 

6) Simple and compatible design

7) Low distortion

8) Good frequency response 

The LM3900 is described in general terms.

The LM3900 series amplifiers are made up of four separate, internally compensated amplifiers that are designed to work with a single or wide power supply voltage. These amplifiers accept a wide range of voltage inputs and have excellent frequency response over the whole audio spectrum. They also have a wide output range.

The LM3900's architecture and pin configuration are depicted in the diagram below.

The Architecture and Pin Configuration of LM3900

• AC Amplifiers

• RC Active Filters

• Low-frequency Triangle

• Square Wave

• Pulse Waveform Generation Circuits

• Tachometers

• Low Speed

• High Voltage

• Digital Logic Gates

The LM3900 Package is shown as follows.

Package

Texas Instruments Incorporated (TI) is an American technology corporation based in Dallas, Texas, that creates and manufactures semiconductors and integrated circuits for electronic designers and manufacturers around the world. Based on sales volume, it is one of the top ten semiconductor businesses in the world. Analog chips and embedded processors, which account for more than 80% of the company's revenue, are the company's main focus.