APA2121

APA2120/2121 Stereo 2-W Audio Power Amplifier (with DC_Volume Control) Features Low Operating Current with 14mA Improved Depop Circuitry to Eliminate Turn-on and Turn-off Transients in Outputs High PSRR 32 Steps Volume Adjustable by DC Voltage with Hysteresis 2W Per Channel Output Power into 4Ω Load at 5V, BTL Mode Two Output Modes Allowable with BTL and SE Modes Selected by SE/BTL Pin Low Current Consumption in Shutdown Mode (50µA) Short Circuit Protection Power off Depop Circuit Integration TSSOP-24P with or without Thermal Pad Package Lead Free and Green Devices Available (RoHS Compliant) Applications NoteBook PC LCD Monitor or TV General Description APA2120/1 is a monolithic integrated circuit, which provides precise DC volume control, and a stereo bridged audio power amplifiers is capable of producing 2.7W(2. 0W) into 3Ω with less than 10% (1.0%)THD+N. The attenuator range of the volume control in APA2120/1 is from 20dB (DC_Vol=0V) to -80dB (DC_Vol=3.54V) with 32 steps. The advantage of internal gain setting can be less components and PCB area. Both of the depop circuitry and the thermal shutdown protection circuitry are integrated in APA2120/1 and reduce pops and clicks noise during power up or shutdown mode operation. It also improves the power off pop noise and protects the chip from being destroyed by over temperature and short current failure. To simplify the audio system design, APA2120/ 1 combines a stereo bridge-tied loads (BTL) mode f...