The LM4921 is a low voltage I2S 16-bit stereo DAC with stereo headphone power amplifiers and volume control. It is primarily designed for demanding applications in mobile phones and other portable communication device applications.
The LM4921 combines a 16‑bit I2S digital‑to‑analog converter with stereo headphone power amplifiers, targeting mobile phones, PDAs and other portable electronic devices. It features an I2S serial audio interface and an SPI‑controlled 32‑step volume control, plus low‑power shutdown and thermal protection.
Key features include a supply voltage range of 2.6 V to 5.5 V, shutdown current of 1 pA, up to 50 mW per channel headphone output with THD < 0.5 %, and a PSRR of 52 dB at 217 Hz. The device is offered in a 20‑bump micro‑SMD package and includes detailed pin‑out and typical application circuits.
| Shutdown current | 1 pA (typ) |
|---|---|
| Volume control | 32 steps, 1.5 dB increments |
The volume control provides 32 steps with 1.5 dB increments.
The typical shutdown current is 1 pA.