If it is used for hi-fi, it is recommended that you use LM4562, which has a wide operating voltage range and high accuracy. The LM4562 is a high-fidelity dual operational amplifier launched by National Semiconductor in recent years, with ultra-small distortion, only 0.00003% of the total harmonic distortion and noise (THD N), in other words, the distortion of this operational amplifier is almost negligible. The LM4562 chip has the advantages of extremely low distortion rate, low noise, high conversion rate, wide operating voltage range and large output current, and the performance is unprecedented. Because of these advantages, the op amp is suitable for professional and high-end audio systems, such as audiovisual 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, not only the built-in high-speed 6MHz unit-gain bandwidth operational amplifier, but also a proprietary stereo audio driver amplifier. In standard operation, the input noise density of the op amp is as low as 2.7nV\/√Hz, the noise Angle of the intermediate frequency is up to 60Hz, and the output current is up to 26mA, which can drive 600Ω loads. The LM4562 chip has a conversion rate of 20V\/μs and a gain bandwidth product of up to 55MHz. The LM4562 chip can maintain stable operation in the supply voltage range between ±2.5V and ±17V, with a maximum output current of 45mA. When operating in the above supply voltage range, the chip's input circuit has a common mode rejection ratio (CMRR) and power supply rejection ratio (PSRR) of more than 108dB, and the input bias current is as low as 10μA(typical).
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Serenade 2 change the best choice of the AD797 single op amp, advanced professional audio is used as a preamplifier. Specific parameters are as follows: bias -500nA, GB value -110Mhz, conversion rate -20V, noise voltage -0.9nV, harmonic distortion (20kHZ) at 3V is -120db. Of course, there are also good choices to use Serenade 2 for other operational amPs, but also consider power consumption, sound quality and stability.