EVAL-SSM2377Z: 3.17W Mono @ 4Ω, 2.5 ~ 5.5V in

The SSM2377 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 components and operates from a single 2.5 V to 5.5 V supply. It is capable of delivering 2.5 W of continuous output power with <1% THD + N when driving a 4 Ω load from a 5.0 V supply.

Spread-spectrum pulse density modulation (PDM) is used to provide lower EMI-radiated emissions compared 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 SSM2377 produces ultralow EMI emissions that significantly reduce the radiated emissions at the Class-D outputs, particularly above 100 MHz. The SSM2377 passes FCC Class B radiated emission testing with 50 cm, unshielded speaker cable without any external filtering.

The device also includes a gain select pin that allows the user to select a 6 dB or a 12 dB gain. This option improves gain matching between multiple SSM2377 devices within a single application as compared to using external resistors to set the gain. Input impedance is 80 kΩ and is independent of the gain setting.

The user guide describes how to configure and use the SSM2377 evaluation board. The user guide should be read in conjunction with the SSM2377 data sheet, which provides detailed information about the specifications, internal block diagrams, and application guidance for the amplifier IC.

The SSM2377 evaluation board carries a complete application circuit for driving a loudspeaker.