The Naxinwei NS4890B user manual provides specifications, pin descriptions, typical circuits, and application guidelines for this 1 W mono audio power…
The NS4890B is a low‑power, mono audio power amplifier designed for portable electronic devices. It offers high PSRR, low noise and THD+N, a wide supply voltage range (2.2 V–5.25 V), and can operate without external output coupling capacitors. The chip includes a shutdown pin for low‑power sleep mode and is supplied in an MSOP‑8 package.
The manual covers functional description, key features, application areas, typical application circuits, absolute maximum ratings, electrical characteristics, pin assignments, reference performance data, application notes, and package dimensions. Detailed tables list electrical parameters, pin functions, and design recommendations for external components. This manual is written in Chinese.
| Output Power (5 V, 8 Ω) | 1.1 W |
|---|---|
| Supply Voltage Range | 2.2 V–5.25 V |
| Power‑Supply Rejection Ratio (PSRR) | 70 dB at 217 Hz and 1 kHz |
| THD+N | < 1 % (5 V, 8 Ω) |
| Static Supply Current (5 V, no load) | 2.45 mA |
The NS4890B can deliver 1.1 W into an 8 Ω load and 1.6 W into a 4 Ω load when powered at 5 V.
No, the amplifier does not need an external output coupling capacitor.
The shutdown mode is controlled by the Shutdown pin (pin 1), which is active low.
The recommended operating supply voltage is from 2.2 V to 5.25 V.