LM4937TLX/NOPB

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The LM4937TLX/NOPB is a product from National Semiconductor that is part of the Linear – Amplifiers – Audio range of integrated circuits. It is an ultra-low distortion, low-noise, stereo headphone amplifier which has a high output current capability that is suitable for driving modern low-impedance headphones. It is a universal product which is suitable for use in high-end portable multimedia applications such as smartphones, tablets, gaming devices and other portable electronic devices.

The LM4937TLX/NOPB is an integrated audio amplifier which incorporates an on-chip negative feedback loop, which reduces distortion and noise by providing an output voltage that is accurately proportional to the input voltage. The feedback loop reduces the total harmonic distortion (THD) to a low-value that is below 1%. The LM4937TLX/NOPB also has an integrated voltage regulator that reduces power consumption and eliminates the need to use separate power supplies.

The amplifier has an adjustable output power and is optimized for low-impedance headphones. It is capable of driving up to 32 ohm headphones with a power output level of up to 120 mW per channel (into a 10 ohm load). It also has a headphone microphone for mono-to-stereo recording and playback, and a headphone monitor, which can be enabled or disabled according to the application. The LM4937TLX/NOPB allows for high-performance operation with a wide range of connections, including USB, LVDS, micro-SD, HDMI, and audio codec systems.

The LM4937TLX/NOPB is based on a highly advanced architecture intended to maximize linearity with minimal distortion and high fidelity. The amplifier features fully differential inputs with a bridge-tied load (BTL) architecture which minimizes power and noise, while providing high-end performance. The integrated BTL output stage consists of two MOSFETs which drive the load to the negative rail. This design also provides excellent protection against output DC offset and inductive load transients.

The LM4937TLX/NOPB features a low-noise pre-amplifier that provides amplification with low distortion. This pre-amplifier is optimized to reduce the noise levels from dynamic sources such as microphones or line-level signals, thus providing a higher quality audio output. The LM4937TLX/NOPB also has an output enable logic input to control the shutdown and enablement of the output stage.

The LM4937TLX/NOPB is an ideal solution for portable or multimedia applications requiring high quality, low-distortion audio amplification. This device is well-suited for mobile applications, where low power consumption is a primary concern. It is also suitable for line-level audio applications, where high input and output voltage ranges are required. The LM4937TLX/NOPB is a low-cost and efficient solution for stereo headphone amplifiers.

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