The EVAL-SSM2375Z is an evaluation board for SSM2375 filterless class D audio amplifier. The SSM2375 is a fully integrated, high efficiency, Class D audio amplifier. It is designed to maximize performance for mobile phone applications. The SSM2375 evaluation board carries a complete application circuit for driving a loudspeaker. The application circuit requires a minimum of external components and operates from a single 2.5V to 5.5V supply. It is capable of delivering 3W of continuous output power with less than 1% THD + N driving a 3R load from a 5V supply. Spread spectrum pulse density modulation (PDM) is used to provide lower EMI radiated emissions compared with other Class D architectures. The SSM2375 includes an optional modulation select pin that enables a low EMI mode, which significantly reduces the radiated emissions at the Class D outputs, particularly above 100MHz.
- Filterless Class D amplifier with spread spectrum Σ-Δ modulation
- 3W into 3R load and 1.4W into 8R load at 5V supply with <1% total harmonic distortion (THD + N)
- 93% efficiency at 5.0V, 1.4W into 8R speaker
- >100 dB signal to noise ratio (SNR)
- High PSSR at 217Hz: 80dB
- Flexible gain adjustment pin: 0dB to 12dB in 3dB steps
- Fixed input impedance: 80KR
- User selectable ultralow EMI emissions mode
- 20nA shutdown current
- Short circuit and thermal protection with autorecovery
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