The SSM3302ACPZ is a fully integrated high efficiency stereo class-D Audio Amplifier. The application circuit requires minimal external components and operates from a single 7 to 18V supply. The device is capable of delivering 2 x 10W of continuous output power into a 4R load (or 2 x 8W into 8R) with <1% THD + N from a 12V supply. In addition, while mono mode is activated, the user can drive a load as small as 2R up to 20W continuous output power by stacking the stereo output terminals. The SSM3302 features a high efficiency, low noise modulation scheme that requires no external LC output filters. This scheme continues to provide high efficiency even at low output power. The SSM3302 operates with 90% efficiency at 7W into a 8R load or with 82% efficiency at 10W into 4R from a 12V supply and it has an SNR of >98dB. Spread spectrum pulse density modulation (PDM) is used to provide lower EMI radiated emissions compared with other class-D architectures.
Filterless stereo Class-D amplifier with Σ-Δ modulation
91% Efficiency at 12V, 8W into 8R speaker
98dB Signal-to-noise ratio (SNR)
Flexible gain adjustment pin from 9 to 24dB
Fixed input impedance of 40kR
Mono output mode pin for 1 x 20W output power into 2R
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