LM4562 is a high-fidelity dual-channel operational amplifier introduced by National Semiconductor Company in recent years. Its distortion is very small, accounting for only 0.00003% of the total harmonic distortion and noise (THD+N). In other words, the distortion of this operational amplifier is almost negligible.
LM4562 chip has the advantages of extremely low distortion rate, low noise, high conversion rate, wide working voltage range and large output current, and its performance is unprecedented. Because of these advantages, the operational amplifier is suitable for professional and high-end audio systems, such as audio-visual system receivers, preamplifiers, audio decoders and high-fidelity power amplifiers, as well as various medical imaging systems and industrial equipment.
The design of LM4562 chip is very unique. It not only has a high-speed 6MHz unity gain bandwidth operational amplifier, but also has a proprietary stereo audio driver amplifier, which is the key circuit of the whole audio system. It has the function of signal adjustment to ensure that the sound system can play an excellent sound effect. Under standard working conditions, the input noise density of the operational amplifier is as low as 2.7nV/√Hz, the intermediate frequency noise transition reaches 60Hz, and the output current reaches 26mA, which can drive a 600 Ω load. The conversion rate of LM4562 chip is 20V/μs, and the gain bandwidth product is as high as 55MHz.
LM4562 chip can work stably in the power supply voltage range from 2.5V to 17V, and the maximum output current is as high as 45mA. When the chip works in the above power supply voltage range, the CMRR and PSRR of the input circuit are both as high as 108dB, while the input bias current is as low as 10μA (typical). With the full support of the output stage, the audio function of LM4562 operational amplifier can be brought into full play.
LM4562 operational amplifier can give full play to its performance even if it drives capacitive loads as high as 100pF. This chip has the mute function of suppressing switching noise, which can reduce the output of the amplifier to equivalent static current, which is very helpful for saving electricity. In addition, the chip also has protection functions such as overheating protection and output short circuit.