It is recommended that you use the LM4562 op amp, which is a high-fidelity dual op amp launched by National Semiconductor in recent years. Its distortion is ultra-small, with only 0.00003% total harmonic distortion and noise (THD+N) , in other words, the distortion of this op amp is almost negligible.
The LM4562 chip has the advantages of extremely low distortion rate, low noise, high slew rate, wide operating voltage range and large output current. Its performance is unprecedentedly high. Because of these advantages, this operational amplifier is suitable for professional-grade and high-end audio systems, such as audio-visual system receivers, preamplifiers, audio decoders and high-fidelity amplifiers, as well as various medical imaging systems and industrial equipment.
The design of the LM4562 chip is very unique. It not only has a built-in high-speed 6MHz unity gain bandwidth operational amplifier, but also adds a proprietary stereo audio driver amplifier, which is the key circuit of the entire audio system. , which has a signal conditioning function to ensure that the audio system can produce excellent sound effects. Under standard working conditions, the input noise density of this operational amplifier is as low as 2.7nV/√Hz, the noise corner of the intermediate frequency reaches 60Hz, the output current reaches 26mA, and it can drive a 600Ω load. The LM4562 chip has a conversion rate of 20V/μs and a gain bandwidth product of 55MHz.
The LM4562 chip can maintain stable operation within the supply voltage range between ±2.5V and ±17V, with a maximum output current of up to 45mA. When this chip operates within the above-mentioned supply voltage range, its input circuit's maximum mode rejection ratio (CMRR) and power supply rejection ratio (PSRR) are both as high as over 108dB, while the input bias current is as low as 10μA (typ. ). With the full support of the output stage, the audio capabilities of the LM4562 operational amplifier can be fully utilized.