SSM2375 Datasheet | Analog Devices

Features Filterless Class-D amplifier with spread-spectrum Σ-Δ modulation 3 W into 3 Ω load and 1.4 W into 8 Ω load at 5.0 V supply with <1% total harmonic distortion (THD + N) 93% efficiency at 5.0 V, 1.4 W into 8 Ω speaker >100 d B signal-to-noise ratio (SNR) High PSSR at 217 Hz: 80 d B Flexible gain adjustment pin: 0 d B to 12 d B in 3 d B steps Fixed input impedance: 80 kΩ User-selectable ultralow EMI emissions mode Single-supply operation from 2.5 V to 5.5 V 20 n A shutdown current Short-circuit and thermal protection with autorecovery Available in 9-ball, 1.5 mm × 1.5 mm WLCSP Pop-and-click suppression APPLICATIONS Mobile phones MP3 players Portable electronics GENERAL DESCRIPTION The SSM2375 is a fully integrated, high efficiency, Class-D audio amplifier. It is designed to maximize performance for mobile phone applications. The application circuit requires a minimum of external ponents and operates from a single 2.5 V to 5.5 V supply. It is capable of delivering 3 W of continuous output power with <1% THD + N driving a 3 Ω load from a 5.0 V supply. The SSM2375 Features a high efficiency, low noise modulation scheme that requires no external LC output filters. The modulation continues to provide high efficiency even at low output power. The SSM2375 operates with 93% efficiency at 1.4 W into 8 Ω or with 85% efficiency at 3 W into 3 Ω from a 5.0 V supply and has an SNR of >100 d B. Spread-spectrum pulse density modulation (PDM) is used to provide lower EMI-radiated emissions pared with other Class-D architectures. The inherent randomized nature of spread-spectrum PDM eliminates the clock intermodulation (beating effect) of several amplifiers in close proximity. The SSM2375 includes an optional modulation select pin (ultralow EMI emissions mode) that significantly reduces the radiated emissions at the Class-D outputs, particularly above 100 MHz. In ultralow EMI emissions mode, the SSM2375 can pass FCC Class B radiated emission testing with 50 cm, unshielded speaker...