The LM49250 is a fully integrated audio subsystem designed for stereo cell phone applications. The LM49250 combines a 2.4W/Ch stereo class D speaker amplifiers with a 45mW/Ch stereo ground referenced headphone amplifier, a class AB earpiece amplifier, National 3D enhancement, volume control, and an input mixer into a single device. The filterless class D amplifiers deliver 1.2W/Ch into an 8Ω load with <1% THD+N from a 5V supply.
The LM49250 features a new circuit technology that utilizes a charge pump to generate a negative supply voltage. This allows the headphone outputs to be biased about ground, thereby eliminating the output-coupling capacitors.
For improved noise immunity, the LM49250 features fully differential left, right and mono inputs
| LM49250 | |
| Speaker Channels | Stereo |
| Speaker Output Power/Ch (W) | 1.23 |
| Speaker PSRR (dB) | 95 |
| Ground Centered Headphone | Yes |
| Headphone Output Power/Ch (mW) | 45 |
| Headphone PSRR (dB) | 95 |
| Audio Mode Control | I2C |
| Supply Voltage (Min) (V) | 2.7 |
| Supply Voltage (Max) (V) | 5.5 |
