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Audio signal processing 1 W × 2-channel

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.
Circuit Diagram:

Audio power IC for mp3 Player

Overview: The AN12941A is an amplifier IC for stereo  speakers which can output 1 W by 8 Ω or 2 W by 4 Ω. 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."  of the speakers. Also, to reduce power consumption, AN12941A  has a built-in function which automatically detects the  input signal and can automatically enter power save  mode when there is no signal. Features: Speaker amplifier is1 W × 2-channel: 8 Ω, VCC = 5 V or2 W × 2-channel: 4 Ω, VCC = 5 VBuilt-in AGC circuit Prevention of the resonance or the vibration by the speaker's energy and the clipping distortion of the speaker 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 automatic power saving).Operating supply voltage: VCC 3.0 V to 5.5 V/ VCC_SP 3.0 V to 5.5 VCircuit Diagram:

2-Channel Preamplifier For Car Stereo LA3160

Features:

Two preamplifiers on chip.Fewer peripheral parts.Low noise.8-pin SIP package facilitating easy mounting.Circuit Diagram:
Datasheet for  LA3160: Download



Two-Channel 20 W BTL Audio Power Amplifier

Overview:
The LA4628 is a 2-channel general-purpose BTL audio power amplifier provided in a miniature package. It was designed for the best possible audio quality and features an extended low band roll-off frequency provided by a newly-developed NF circuit that does not require an external capacitor. Furthermore, crosstalk, which can cause muddiness in the audio output, has been significantly reduced by both circuit and wiring pattern improvements. Thus this amplifier can provide powerful lows an clear highs. Note that this device is pin compatible with the 13.5 W × 2-channel LA4625, and allows end products differentiated by their power rating to share the same printed circuit board.
Features: Total output: 20 W + 20 W (at VCC = 13.5 V, RL = 4 Ω,THD = 10%)High-fidelity design (fL < 10 Hz, fH = 130 kHz)Extremely low impulse noise levelsAn arbitrary amplifier startup time can be set up with external components.Full complement of built-in protection circuits (includes circuits that prote…

2-Channel 30W BTL Audio Amplifier

2 x 20 W Class D / 1-Bit Audio Power Output Stage

FEATURES Class D/1-Bit Audio Power Output Stage5 V Analog and Digital Supply VoltagesPower Stage Power Supply 8 V to 20 VOutput Power @ 0.1% THD + NStereo Mode2 20 W @ 4  @ 14.4 V2 20 W @ 8  @ 20 VMono Mode1 40 W @ 4  @ 20 VRON < 320 m (per Transistor)Efficiency > 85% @ Full Power/8 Clickless Mute FunctionTurn-On and Turn-Off Pop SuppressionShort-Circuit ProtectionOvertemperature ProtectionData Loss Protection2-Channel BTL Outputs or4-Channel Single-Ended Outputs52-Lead Exposed Pad TQFP PackageLow Cost DMOS Process
APPLICATIONS: PC Audio SystemsMinicomponentsAutomotive AmplifiersHome Theater SystemsTelevisionsGENERAL DESCRIPTION:
The AD1991 is a 2-channel BTL or 4-channel single-ended class D audio power output stage. The part is configured during reset to be in either 2-channel mode or 4-channel mode. To protect the IC as well as the connected speakers, the AD1991 provides turn-on and turn-off pop suppression, short-circuit protection, and overtemperature shutdown. To control…