The LM49153 is a fully integrated audio subsystem designed for portable handheld applications such as cellular phones. Part of National’s PowerWise family of products, the LM49153 combines an earpiece switch, a high efficiency 25mW class G headphone amplifier, and a high efficiency 1.35W class D loudspeaker into a single device.
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 class D amplifier features an ALC (Automatic Level Control) with a noise gate that provides both no-clip and speaker protection.
Mode selection, shutdown control, and volume are controlled through an I 2C compatible interface
| LM49153 | |
| Speaker Channels | Mono |
| Speaker Output Power/Ch (W) | 1.35 |
| Speaker PSRR (dB) | 72 |
| Ground Centered Headphone | Yes |
| Headphone Output Power/Ch (mW) | 25 |
| Headphone PSRR (dB) | 94 |
| Audio Mode Control | I2C |
| Supply Voltage (Min) (V) | 2.7 |
| Supply Voltage (Max) (V) | 5.5 |
