Overview
The LM4766 is a dual-channel, high-power amplifier integrated circuit introduced by the US company NS. Each channel can deliver 40 W average into an 8 Ω load, with total harmonic distortion below 0.1%. In the company's product lineup, the LM4766 is placed in the Overture series as a high-end single-chip dual-channel audio power amplifier.
Key Specifications
The LM4766 shows strong performance in distortion and signal-to-noise ratio. In the audible band, with 30 W output, measured distortion and noise can be as low as 0.06%. The supply voltage range is relatively wide, spanning 20 V to 94 V, making it suitable for mid- to high-power audio amplifier designs.
The device's typical operating supply is up to ±30 V, with 40 W output capability; the practical maximum supply can reach about ±35 V.
Compared with the LM1875, the LM4766 supports a wider supply range and higher power. Its output capability is greater, and it tends to present a cleaner, more neutral sound suitable for applications requiring high accuracy and low distortion, such as cinemas, recording studios, and live performance systems.
The LM4766 has a slew rate of 9 V/us.
By comparison, the LM3886 has a slew rate of 19 V/us, roughly double that of the LM4766.
If output power primarily indicates loudness, the slew rate is a parameter that significantly influences perceived sound quality.
Advantages and Disadvantages
Advantages:
- High performance: The LM4766 provides low distortion audio power amplification with a wide supply voltage range and substantial output power, enabling strong audio performance.
- Suitable for multiple environments: The LM4766 can be used where high-quality audio output is required, such as cinemas, recording studios, and live stages, delivering clear and realistic sound.
- Easy integration: The LM4766 uses standard audio interfaces, facilitating connection to various audio equipment and system integration.
Disadvantages:
- Relatively high cost: As a higher-end audio power amplifier, the LM4766 can increase overall system cost compared with lower-tier options.
- Power supply requirements: The LM4766 benefits from a stable, well-regulated power supply; poor power quality or large supply fluctuations can degrade performance.
- Tuning complexity: Although it is straightforward to connect, achieving optimal performance can require experience in audio design and careful adjustment.
