NJM4560 Dual Op-Amp IC

7 July 2018 - 0 Comments

NJM4560 Dual Op-Amp IC

NJM4560 Op amp Pinout

NJM4560 Pin Configuration

Pin Number	Pin Name	Description
1,7	Output	Provides the amplified Audio output
2,6	Inverting Input (IN-)	The Inverting Pin of amplifier is normally grounded
3,5	Non-Inverting Input (IN+)	The Non-Inverting pin is provided with the audio signal
4	Vcc-	Connected to the negative supply rail
8	Vcc+	Connected to Positive Supply Rail

NJM4560 Operational Amplifier Features and Specifications

Supply Voltage: 4-18V
Power Dissipation: mW
Bandwidth: 10 MHz typically
Offset voltage 0.5V
Offset Current: nA
Voltage Gain: 100 dB
CMRR: 90 (typically)
Speaker impedance 4Ω
Available in 8-Pin DIP,DMP,SOP and SIP packages

Note: Complete technical details can be found in the NJM4560 Datasheet linked at the bottom of this page.

NJM4560 Equivalent IC

C4556C

Alternatives Audio Amplifiers

LM386, AD620, IC6283, JRC4558

Where to use the NJM4560 Op amp

The NJM4560 is a Dual Operational Amplifier IC, meaning it has two Op-Amps inside its package and they are commonly used for audio amplification because of their wide bandwidth gain. It is capable of driving 20V peak to peak voltage and thus can drive loads upto 400Ω. It has a good input impedance value of 5MΩ and a voltage gain of 100dB which makes it ideal for distortion circuits.

So if you are looking for a dual package Operaitional amplifier IC with high-gain and wide bandwidth for audio amplification, then this IC might be the right choice for you.

How to use NJM4560 IC

The NJM4560 is most commonly used as an audio amplifier. Since it has two Op-Amp in a single package it is very convenient to build power amplifier circuits like a subwoofer circuit where the amplified signal of one Op-Amp is supplied to the other Op-Amp for further amplification. The IC can operate both in single supply or dual supply voltage. Even though an Audio amplifier will have some advantages working with a dual supply voltage, single supply is commonly used because of its simplicity and does not require major change in the circuit. A very plain single supply non-inverting amplifier is shown below.

NJM4560 Op amp circuit

Biasing the non-Inverting terminal of an Op-Amp gets a bit tricky for amplifier running on single power supply. The most common way to achieve this by using a potential divider as shown above other methods involve using a Zener diode or even using a linear voltage regulator circuit.

Another important thing to consider while building an audio amplifier is the bandwidth of the design. The formulae to calculate the bandwidth at each point in the circuit is already given above. However this simple circuit has potentially serious limitations since the change in supply voltage will also affect the biasing of the Op-Amp and the Common mode noise at the power side will also be amplified.