SSM2211

Data Sheet FEATURES 1.5 W output with THD + N < 1% Differential bridge-tied load output Single-supply operation: 2.7 V to 5.5 V Functions down to 1.75 V Wide bandwidth: 4 MHz Highly stable phase margin: >80° Low distortion: 0.2% THD + N at 1 W output Excellent power supply rejection APPLICATIONS Portable computers Personal wireless communicators Hands-free telephones Speaker phones Intercoms Musical toys and talking games GENERAL DESCRIPTION The SSM22111 is a high performance audio amplifier that delivers 1 W rms of low distortion audio power into a bridgeconnected 8 Ω speaker load (or 1.5 W rms into a 4 Ω 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. Low Distortion, 1.5 W Audio Power Amplifier SSM2211 FUNCTIONAL BLOCK DIAGRAM IN– VOUTA IN+ BYPASS SHUTDOWN VOUTB BIAS V– (GND) Figure 1. SSM2211 00358-001 The low differential dc output voltage results in negligi...