BA5204F

Audio ICs 3V / 35mW dual power amplifier BA5204F The BA5204F is a dual-channel power amplifier designed for 3V stereo headphone tape players. There is almost no “pop” sound generated when the power is switched on and off, so this IC is ideal for headphone applications. Input coupling capacitors are not required, and only one filter capacitor is needed which helps reduce set size. In addition to operating off low voltage, the IC has low distortion, making it suitable for Hi-Fi applications. The circuit can operate down to 1.5V, and has excellent ripple rejection ratio, so it is not adversely influenced by the motor or tape transport systems. FApplications 3V compact cassette headphone stereos players, micro cassette players, and FM stereo radios FFeatures 1) Rated output of 35mW (RL = 32Ω) off a 3V power supply. 2) Low “pop” noise when power is switched on and off. 3) Low quiescent current (13mA). 4) Excellent ripple rejection ratio (38dB). 5) Begins operating at 1.5V. FBlock diagram 6) 7) 8) 9) 10) Low distortion (0.05% at PO = 5mW). Good voltage gain balance between channels. Good channel separation (60dB Typ.). Input coupling capacitors not required. Symmetrical pin assignments facilitates PCB design. 373 Audio ICs FInternal circuit configuration BA5204F FCircuit description (refer to the Internal Circuit diagram) (1) Preamplifier Stage The preamplifier is comprised of the level-shift transistor Q101, a differential amplifier (Q102 and Q105), and the active load (Q1...