NJM2120M

Series:	--
Packaging:	Tube
Part Status:	Obsolete
Amplifier Type:	General Purpose
Number of Circuits:	2
Output Type:	--
Slew Rate:	2.2 V/µs
Gain Bandwidth Product:	7MHz
Current - Input Bias:	80nA
Voltage - Input Offset:	800µV
Current - Supply:	2.3mA
Voltage - Supply, Single/Dual (±):	±2.5 V ~ 18 V
Operating Temperature:	-40°C ~ 85°C
Mounting Type:	Surface Mount
Package / Case:	8-SOIC (0.209", 5.30mm Width)
Supplier Device Package:	8-DMP

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NJM2120M Application Field and Working Principle

NJM2120M is a linear amplifier, instrumentation OP-amps, buffer amps designed to cover a wide range of applications. It is a high-precision operational amplifier with very low noise, wide voltage operational range and low gain error. It has an improved FET input stage in order to reduce the input bias and offset current which is ideal for driving 1/f noise required applications.

Features

NJM2120M has an array of features, some of which are as follows:

• Wide Offset Voltage and Operating Voltage: 0.4 V/V to 28 V/V
• Low Supply Current: 175 uA maximum
• Low Input Bias Current: 75 nA maximum
• Low Input Offset Voltage: 0.5 mV maximum
• Low Gain Error: 0.2 dB maximum
• Wide Bandwidth: 4 MHz minimum
• High Slew Rate: 10 V/uS minimum

Applications

NJM2120M has a wide range of uses, ranging from industrial to medical applications due to its low noise, high accuracy and wide voltage range:

• Data acquisition systems
• Portable oscilloscopes
• Automatic test equipments
• Communication equipment
• Medical equipments

Working Principle

NJM2120M is based on the voltage feedback operational amplifier topology. It includes an array of bipolar junction transistors (BJTs) and field-effect transistors (FETs) that control the circuit parameters. The BJTs are connected in a configuration of three gain stages, where the input stage is a compound differential amplifier that limits the input bias and offset current. The second stage is a voltage-controlled current source transistor, which controls the output voltage gain. The last stage consists of a common emitter amplifier with a feedback resistor network, which provides the required output impedance.The FETs control the input bias current of NJM2120M by adjusting their gate-to-source voltage with respect to the current source transistor. This arrangement effectively reduces the input bias current and provides an improved FET input stage for varying the input bias current. Furthermore, the voltage feedback circuit provides excellent gain accuracy and stability.

Conclusion

In conclusion, NJM2120M is an excellent choice for a wide variety of applications requiring good noise, accuracy and temperature stability. Its salient features, like low input bias current, low gain error, and wide voltage operating range make it well suited to a wide range of uses. The FET input stage also helps to enhance the performance further, and the voltage feedback circuit provides excellent gain accuracy and stability.

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