Output Capacitor-less Audio Subsystem With Programmable National 3D

The LM4845 is an Audio Power Amplifier capable of delivering 500mW of continuous average power into a mono 8 bridged-tied load (BTL) with 1% THD+N, 25mW per channel of continuous average power into stereo 32 single-ended (SE) loads with 1% THD+N, or an output capacitor-less (OCL) configuration with identical specification as the SE configuration, from a 3.3V power supply.
The LM4845 features a 32-step digital Volume Control and eight distinct output modes. The digital Volume Control 3D enhancement, and output modes (mono/SE/OCL) are programmed through a two-wire I2C or a three-wire SPI compatible Interface that allows flexibility in routing and mixing Audio channels. The LM4845 has three input channels: one pair for a two-channel stereo signal and the third for a single-channel mono input.
The LM4845 is designed for cellular phone, PDA, and other portable handheld applications. It delivers high quality output power from a surface-mount package and requires only seven external components in the OCL mode (two additional components in SE mode).
By National Semiconductor Corporation
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LM4845 Application circuits
LM4845 circuits
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