The LM49251 is a fully integrated audio subsystem designed for portable handheld applications such as cellular phones. Part of National’s PowerWise family of products, the LM49251 utilizes a high efficiency class G headphone amplifier topology as well as a high efficiency class D loudspeaker.
The headphone amplifiers feature National’s class G ground referenced architecture that creates a ground-referenced output with dynamic supply rails for optimum efficiency. The stereo class D speaker amplifier provides both a no-clip feature and speaker protection. The Enhanced Emission Suppression (E 2S) outputs feature a patented, ultra low EMI PWM architecture that significantly reduces RF emissions
| LM49251 | |
| Speaker Channels | Stereo |
| Speaker Output Power/Ch (W) | 1.37 |
| Speaker PSRR (dB) | 77 |
| Ground Centered Headphone | Yes |
| Headphone Output Power/Ch (mW) | 20 |
| Headphone PSRR (dB) | 83 |
| Audio Mode Control | I2C |
| Supply Voltage (Min) (V) | 2.7 |
| Supply Voltage (Max) (V) | 5.5 |
