This audio amplifier based on the TS4997 audio amplifier IC manufactured by ST Semiconductor is a low power audio amplifier with a maximum output power of 1 Watt per channel ( 2x1W)  on 8 ohms load . TS4997 stereo differential audio amplifier offer 3D effect enhancement designed for low power applications .
3D effects enhancement is programmed through a two digital input pin interface that allows more flexibility on each output audio sound channel.
TS4997 audio amplifier IC operates from a input voltage range from 2.7V to 5.5V .
Each output channel has its own external controlled standby mode pin to reduce the supply current to less than 10nA per channel.

This audio amplifier IC offers internal thermal shutdown protection and many other features like : 1W output power per channel @ VCC=5V, THD+N=1%, RL=8Ω , Ultra low standby consumption , 80dB PSRR @ 217Hz with grounded inputs , High SNR: 106dB(A) typ , Fast startup time: 45ms typ. ,  Pop&click-free circuit .This audio amplifier design is very simple requiring just few external components :
- input resistors that set the closed loop gain in conjunction with a fixed internal feedback resistor (Gain = Rfeed/RIN, where Rfeed = 50kΩ).
-input coupling capacitors that block the DC voltage at the amplifier input terminal
-Supply bypass capacitors that provide power supply filtering.
-Bypass pin capacitor that provides half supply filtering.