The SSM22111 is a high performance audio amplifier that delivers 1 W rms of low distortion audio power into a bridgeconnected 8 ? speaker load （or 1.5 W rms into a 4 ? load）。 The SSM2211 operates over a wide temperature range and is specified for single-supply voltages between 2.7 V and 5.5 V. When operating from batteries， it continues to operate down to 1.75 V. This makes the SSM2211 the best choice for unregulated applications， such as toys and games. Featuring a 4 MHz bandwidth and distortion below 0.2% total harmonic distortion plus noise （THD + N） at 1 W， superior performance is delivered at higher power or lower speaker load impedance than competitive units. Furthermore， when the ambient temperature is at 25°C， THD + N 《 1%， and VS = 5 V on a 4-layer printed circuit board （PCB）， the SSM2211 delivers a 1.5 W output.

　　The low differential dc output voltage results in negligible losses in the speaker winding and makes high value dc blocking capacitors unnecessary. The battery life is extended by using shutdown mode， which typically reduces quiescent current drain to 100 nA. The SSM2211 is designed to operate over the ?40°C to +85°C temperature range. The SSM2211 is available in 8-lead SOIC （narrow body） and LFCSP （lead frame chip scale） surfacemount packages. The advanced mechanical packaging of the LFCSP models ensures lower chip temperature and enhanced performance relative to standard packaging options. Applications include personal portable computers， hands-free telephones and transceivers， talking toys， intercom systems， and other low voltage audio systems requiring 1 W output power.