AN12942B Datasheet | Panasonic

Overview AN12942B is an one-chip IC for the stereo speakers which can output 1 W by 8 Ω, headphone amplifiers, line amplifiers, and electronic volumes. The AGC circuit is built-in to prevent the resonance or the vibration by the speaker’s energy and the clipping distortion what is called "broken up sound". Also the AN12942B is built-in power saving on/off function automatically detecting input signal to save the power of speaker amplifier. - Features - Speaker amplifier 1 W × 2-channel: 8 Ω, VCC = 5 V - Built-in AGC circuit Prevention of the resonance or the vibration due to the speaker and the clipping distortion by AGC at excessive input signal (with AGC on/off switch). - Built-in automatic power saving function. It detects input signals and switches on/off (with the on/off switch for the auto power saving). - Built-in headphone amplifier and line amplifier - Applications - Notebook PC - Package - Dual surface implementing package (HSOP056-P-0300A) - Type - Silicon monolithic bipolar IC Publication date: June 2003 SDC00047AEB - Application circuit example Out-L-ch. (Line) - 9.17 d BV 1 µF 29 30 31 Line mute - 10 d BV 0.47 µF 28 27 GND 26 25 24 + + 23 22 21 EVR EVR 20 19 Offset cancel Offset cancel 18 PRI Charge 17 VCC 16 GND 15 14 13 AGC AGC Offset cancel Det. Signal det. Control Mute Save CTL 14 d B 14 d B Mute 12 11 10 GND 9 8 7 SP GND 6 5 Power save 4 3 14 d B VCC_SP 14 d B VCC_SP 2 1 - 2 d BV 8Ω R-ch. out - 2 d BV 10 µF VREF 10 µF 0. 1 µF 10 µF 0.47 µF - 10 d BV 1.1 times 1.1 times In-L-ch. (Line,HP) In-R-ch. (Line,HP) Out-R-ch. (Line) 1 µF 1 µF Line mute STBY VCC Beep in - 9.17 d BV 1 MΩ Switch B 0.47 µF 32 Standby 33 34 35 Switch B-2 Switch B-1 Switch A-3 Switch A-2 Switch A-1 BVREF EVRCTL Switch A 1 µF 1 µF HP power save HP mute 100 µF 100 µF 220 k 37 GND 38 6 d B - 4 d BV 39 - 4 d BV 40 6 d B 41 GND 42 Power save 1 µF 10 µF Save CTL 20 kΩ 0. 47 µF V (SP) 43 REF - 13 d BV - 3 d B 44 - 13 d...