This datasheet provides detailed information on the STA381BWS product, including the product's power supply range, interface, power amplifier configuration, output power, dynamic range, output frequency, etc.
The STA381BWS is a 2.1-channel high-efficiency digital audio system designed for wide-range supply voltages from 4.5 V to 25.5 V. It supports three output power stage configurations: 2.0 mode with L/R full bridges, 2.1 mode with L/R two half-bridges and a subwoofer full bridge, or 2.1 mode with L/R full bridges and a PWM output for an external subwoofer amplifier. The device offers driving load capabilities of 2x20 W into 8 ohms in ternary modulation mode.
Key features include FFX™ technology for a 100 dB dynamic range, a fixed output PWM frequency, and an embedded RMS meter for measuring real-time loudness. The chip includes extensive protection mechanisms such as manufacturing short-circuit protection, thermal protection, overcurrent protection, and undervoltage protection. It also features two independent DRCs configurable as dual-band anticlipper or independent limiters/compressors (STCompressor™) and up to 12 user-programmable biquads with noise-shaping technology.
| Supply voltage (operating) | 4.5 V to 25.5 V |
|---|---|
| Supply voltage (absolute maximum) | 27 V |
| Analog input level | 1 Vrms stereo |
| Sampling rate range | 32 kHz to 192 kHz |
| Dynamic range | 100 dB |
| Power output (2x20 W mode) | 2x20 W into 8 ohms |
| Power output (2x9 W mode) | 2x9 W into 4 ohms |
| Subwoofer power output | 20 W into 8 ohms |
| Headphone output power | 40 mW into 32 ohms |
| Line output capability | 2 Vrms |
| Digital gain range | +48 dB to -80 dB |
| Package type | VQFN48 (7 x 7 mm) |
The device supports 2.0 mode with L/R full bridges, 2.1 mode with L/R two half-bridges and a subwoofer full bridge, or 2.1 mode with L/R full bridges and a PWM output for an external subwoofer amplifier.
The FFX™ technology provides a 100 dB dynamic range.
Yes, one of the configurations allows for a PWM output specifically designed for an external subwoofer amplifier.