The LM49270 is a fully integrated audio subsystem designed for stereo multimedia applications. The LM49270 combines a 2.2W stereo Class D amplifier with a 155mW stereo headphone amplifier, volume control, headphone sense, and National’s unique 3D sound enhancement into a single device. The LM49270 uses flexible I 2C control interface for multiple application requirements.
The filterless stereo class D amplifiers delivers 2.2W/channel into a 4Ω load with less than 10% THD+N with a 5V supply. The headphone amplifier features National’s Output Capacitor-less (OCL) architecture that eliminates the output coupling capacitors required by traditional headphone amplifiers.
The IC features a headphone sense input (HPS) that automatically detects the presence of a headphone and configures the device accordingly
| LM49270 | |
| Speaker Channels | Stereo |
| Speaker Output Power/Ch (W) | 1.06 |
| Speaker PSRR (dB) | 75 |
| Headphone Output Power/Ch (mW) | 90 |
| Headphone PSRR (dB) | 79 |
| Audio Mode Control | I2C |
| Supply Voltage (Min) (V) | 2.4 |
| Supply Voltage (Max) (V) | 5.5 |
