G1421

Global Mixed-mode Technology Inc. G1421 2W Stereo Audio Amplifier with No Headphone Coupling Capacitor Function Features Depop Circuitry Integrated „ Output Power at 1% THD+N, VDD=5V --1.8W/CH (typical) into a 4Ω Load --1.2W/CH (typical) into a 8Ω Load „ Eliminates Headphone Amplifier Output Coupling Capacitors „ Maximum Output Power Clamping Circuitry www.DataSheet4U.com Integrated „ Bridge-Tied Load (BTL), Single-Ended (SE), and Stereo Headphone Amplifier (HP-IN) modes Supported „ Stereo Input MUX „ Mute and Shutdown Control Available „ Surface-Mount Power Package 24-Pin TSSOP-P „ General Description G1421 is a stereo audio power amplifier in 24pin TSSOP thermal pad package. It can drive 1.8W continuous RMS power into 4Ω load per channel in Bridge-Tied Load (BTL) mode at 5V supply voltage. Its THD is smaller than 1% under the above operation condition. To simplify the audio system design in the notebook application, G1421 supports the Bridge-Tied Load (BTL) mode for driving the speakers, Single-End (SE) mode for driving the headphone. In the HP-IN mode, it can support a DC value to the phone-jacket and drive the headphone without the audio amplifier outputs coupling capacitors. G1421 can mute the output when Mute-In is activated. For the low current consumption applications, the SHDN mode is supported to disable G1421 when it is idle. The current consumption can be further reduced to below 5µA. G1421 also supports two input paths, that means two different gain loops can ...