The LM48822 is a single supply, ground-referenced stereo headphone amplifier designed for portable devices, such as cell phones, where board space is at a premium. The LM48822 features National’s ground-referenced architecture, which eliminates the large DC blocking capacitor required by traditional headphone amplifiers, saving board space and minimizing system cost.
The LM48822 features common-mode sensing that corrects for any differences between the amplifier ground and the potential at the headphone return terminal, minimizing noise created by any ground mismatches.
The LM48822 delivers 35mW/channel into a 16Ω load with <1% THD+N with a 3.6V supply. High power supply rejection ratio (PSRR), of 110dB at 217Hz, allows the device to operate in noisy environments without additional power supply conditioning
| LM48822 | |
| Headphone Channels | Stereo |
| Volume Control | Yes |
| Supply Max (Max) (Volt) | 5.5 |
| Supply Min (Min) (Volt) | 2.4 |
| THD (%) | 0.04 |
| Ground-Centered Outputs | Yes |
| Output Power (W) | 0.035 |
| Load (Min) (ohms) | 16 |
| ISD (uA) | 0.06 |
| PSRR (dB) | 110 |
