NJM12904M

Series:	--
Packaging:	Tube
Part Status:	Active
Amplifier Type:	General Purpose
Number of Circuits:	2
Output Type:	--
Slew Rate:	0.7 V/µs
Gain Bandwidth Product:	1.5MHz
Current - Input Bias:	20nA
Voltage - Input Offset:	1mV
Current - Supply:	700µA
Voltage - Supply, Single/Dual (±):	2 V ~ 14 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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NJM12904M Application Field and Working Principle

The NJM12904M is an ultra-low noise dual operational amplifier with high precision and speed. It is commonly used in linear amplifiers, instrumentation amps, buffer amplifiers and other general-purpose applications.

Linear Amplifier Applications

The NJM12904M dual op amp provides excellent low noise characteristics for linear amplifier applications. In these applications, it is used to have a low noise operation and can handle an input signal with low distortion and high fidelity. It is also used in audio preamplifier and speaker amplifier circuits.

Instrumentation Amplifier Applications

The NJM12904M dual op amp is also used in instrumentation amplifier circuits. This type of circuit provides a high level of isolation and rejects common mode signals. It is often used in precision voltage-controlled devices in which high accuracy and low noise are important. Instrumentation amplifiers are typically used in medical equipment, communication systems and automotive electronics.

Buffer Amplifier Applications

The NJM12904M dual op amp is also suitable for buffer amplifier applications in which it is used to provide isolation and reduce loading effects. It is commonly used in microphone preamplifiers to provide a low noise level and reduce loading effects on microphones. It is also used in analog-to-digital converter systems to provide a high input impedance and low noise performance.

Operating Principle

The NJM12904M is an operational amplifier, meaning it takes an input signal and amplifies or attenuates it based on the user\'s settings. The specific operation of the device is based off its unique design, which includes two transistors for each amplifier, a V Ref terminal for setting the references, and two unipolar transistors for the output of the amplifier.The NJM12904M is a two-stage amplifier, meaning the first stage amplifies the signal and the second stage provides feedback. The input stage amplifies the signal based on the resistor values between the collectors and base of the transistors and the voltage applied to the VREF terminal. This voltage is also applied to one of the collectors of the second stage transistors and helps modulate the output accordingly.The feedback mechanism of the NJM12904M is achieved via the two transistors of the second stage and is regulated by the resistance between their respective collectors and the VREF terminal. This resistance determines the amount of gain and feedback and helps the amplifier to adjust its the frequency response and other characteristic, such as the gain-bandwidth. The NJM12904M also has a low-noise feature, meaning it is capable of amplifying signals without introducing excessive amounts of noise. This feature is achieved through the use of a high-quality open loop gain design, which reduces the amount of noise generated. The NJM12904M is a versatile operational amplifier that is widely used in many applications. Through its low noise and adjustable gain characteristics, it is an ideal choice for applications that require precision and high fidelity.

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