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NS4168

    The NS4168 is a 2.5W mono Class D audio power amplifier that supports I2S digital audio signal input with anti-distortion output. The NS4168 is particularly suitable for power-sensitive environments that generate interference. Such as Bluetooth speakers, WiFi speakers, tablets and so on.
    In these applications, system noise can destroy the small analog signal sent to the amplifier, and the I2S standard is sent digitally to the audio amplifier, significantly reducing the impact of the noise source on the transmitted audio. In addition, it also avoids the noise caused by the audio decoding DAC built into the MCU master chip, and finally obtains a higher signal-to-noise ratio and a smaller distortion degree. No input coupling capacitors are required to detect the internal input height of the first-line pulse by using the CTRL pin

NS4168 Description:
    The NS4168 is a 2.5W mono Class D audio power amplifier that supports I2S digital audio signal input with anti-distortion output. The NS4168 is particularly suitable for power-sensitive environments that generate interference. Such as Bluetooth speakers, WiFi speakers, tablets and so on.
    In these applications, system noise can destroy the small analog signal sent to the amplifier, and the I2S standard is sent digitally to the audio amplifier, significantly reducing the impact of the noise source on the transmitted audio. In addition, it also avoids the noise caused by the audio decoding DAC built into the MCU master chip, and finally obtains a higher signal-to-noise ratio and a smaller distortion degree. Without the need for input coupling capacitors, the control pin detects the first-line pulse and selects the turning point of the internal input high-pass filter to match different speakers. PCB wiring does not need to carefully consider the layout and wiring of the audio amplifier, the periphery is more concise and debugging is more convenient.
   The NS4168's unique anti-distortion function can effectively prevent input signal overload and output signal distortion caused by battery voltage drop, and can effectively protect the speaker from being damaged during high-power output.
    The NS4168 uses a high-efficiency, low-noise modulation scheme that eliminates the need for an external LC output filter. The closed-loop multistage modulator design retains the high efficiency benefits of pure digital amplifiers while providing excellent PSRR and audio performance. Compared with other Class D architectures, the use of spread spectrum pulse density modulation can provide lower electromagnetic radiation. NS4168 at 5V operating voltage, can be 4? The load provides 2.5W output power.
    The NS4168 is a mono audio amplifier. The left and right channel selection is set by CTRL pin level. Stereo products can choose two chips, very flexible.
    NS4168 built-in overcurrent protection, overheat protection and undervoltage protection functions, effectively protect the chip from being damaged under abnormal working conditions.
    The NS4168 is available in an ESOP8 package with a rated operating temperature range of -40 ° C to 85 ° C.


NS4168 Features:
Output power Po: 2.5W(VDD=5V, RL=4?)
Operating voltage range: 3.0V ~ 5.5V
0.2%THD (VDD=5V, RL=4? , Po=1W)
80% efficiency (VDD=5V, RL=4? , Po=2.5W)
I2S serial digital audio input interface
Supports a wide sampling rate: 8kHz to 96kHz
Automatic sampling rate detection, adaptive function
The left and right channels are optional and set by CTRL pin
Anti-distortion NCN function,
Class D amplifier without filter
Excellent "power on, power off" noise suppression
Overcurrent protection, overheat protection, undervoltage protection
The NS4168 is available in an ESOP8 package

NS4168 Applications:
MP3/PMP
Mini speaker
Digital photo frame

NS4168 Typical application circuit diagram:
NS4168 Pin distribution:

NS4168 pin definition:

NS4168 schematic diagram:

NS4168 package diagram:

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