LM4901MMX/NOPB

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LM4901MMX/NOPB is a single channel audio amplifier from Linear Technology. It is specifically designed to meet the requirements of portable consumer and professional audio applications. The device is a low power, wide dynamic range, low noise, high voltage, Class-AB audio amplifier with a wide range of gain settings, superb frequency response and low total harmonic distortions.

The LM4901MMX/NOPB can operate in either of two gain modes - fixed and variable. In variable mode, the gain can be set between -20 db and 15 dB (± 0.5 dB). In fixed mode, the nominal gain is 10 dB and it can be adjusted in the range of -20 dB to 20 dB (± 0.5 dB).

The device is rated for a maximum input voltage of 175 mVrms and a maximum output power of 3W into a 4 Ω load with a 5V supply. It features an internally trimmable gain of 10 dB to 19 dB and a distortion of <0.05%. The LM4901MMX/NOPB also features an output voltage swing of up to 16 Vpp and can drive 4Ω speakers.

The LM4901MMX/NOPB is designed for use in a wide range of audio applications, including portable music players, portable amplifiers, professional audio systems, PCs and gaming consoles. The device integrates an on-chip thermal shut down feature, a soft start, a mute function and an adjustable gain level. It also provides adjustable power-down options to reduce power dissipation.

The LM4901MMX/NOPB also integrates a differential input stage, a high-bandwidth output stage and an integrated split rail power supply to help maintain low distortion performance. The device also features low-output offset voltage, fast turn on/off times and high-input impedance for AC coupling.

The LM4901MMX/NOPB works on the principle of conversion of input voltage into output voltage. This is done using a differential amplifier with a low noise input stage, a high-gain output stage and an internally-trimmable gain control. The input signal is split into two differential signals, which are then amplified and combined to produce the output voltage. The output voltage can be adjusted using the gain control.

The LM4901MMX/NOPB is well-suited for applications that require high-volume, low-noise output, such as portable media players, gaming consoles and personal digital assistants. Its low power consumption and wide dynamic range make it a good choice for portable applications, and its high voltage and low total harmonic distortion ensure excellent audio performance.

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