The LM4947 is an audio subsystem capable of efficiently delivering 500mW (Class D operation) of continuous average power into a mono 8Ω bridged-tied load (BTL) with 1% THD+N, 37mW (Class AB operation) power channel of continuous average power into stereo 32Ω 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 LM4947 has six input channels: one pair for a two-channel stereo signal, the second pair for a secondary two-channel stereo input, and the third pair for a differential single-channel mono input. Additionally, the two sets of stereo inputs may be configured as a single stereo differential input (differential left and differential right).
| LM4947 | |
| Speaker Channels | Stereo |
| Speaker Output Power/Ch (W) | 1.19 |
| Speaker PSRR (dB) | 79 |
| Headphone Output Power/Ch (mW) | 87 |
| Headphone PSRR (dB) | 83 |
| Audio Mode Control | I2C |
| Supply Voltage (Min) (V) | 2.7 |
| Supply Voltage (Max) (V) | 5.5 |
