The LM4921 combines a 16-bit resolution stereo I 2S input digital-to-analog converter (DAC) with a stereo headphone audio power amplifier. It is primarily designed for demanding applications in mobile phones and other portable communication device applications. The LM4921 features an I 2S serial interface for the digital audio information and a 16-bit SPI serial interface for internal register control and communication. With AVDD and DVDD = 3.0VDC and driving a 32Ω single-ended load to a 26mWRMS output level the distortion (THD+N) of the LM4921 will be less than 0.5%. The LM4921 also features a programmable 32-step digital volume control accessed through an SPI interface.
Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external component
| LM4921 | |
| Headphone Channels | Stereo |
| Volume Control | Yes |
| Supply Max (Max) (Volt) | 5.5 |
| Supply Min (Min) (Volt) | 2.6 |
| THD (%) | 0.03 |
| Output Power (W) | 0.05 |
| Load (Min) (ohms) | 32 |
| ISD (uA) | 1 |
| PSRR (dB) | 62 |
