Ruigu Electronic

NTP8938 is a low internal resistance, high-performance digital audio amplifier chip launched by NF (NaiFu) of South Korea. The following is its detailed introduction:

1. Key Performance Parameters

• Output Power: Supports 2CH stereo (30W x 2 BTL). In PBTL mode, the power is approximately 60W when the total harmonic distortion (THD) is within 1%.
• Power Supply Voltage Range: The operating power supply voltage ranges from 5V to 28V, covering a wide range of application scenarios.
• Audio Input: Receives digital serial audio data with sampling rates of 32kHz, 44.1kHz, 48kHz, and 96kHz. It supports Hi-Res audio systems and is capable of processing high-quality audio data with 24-bit depth and 96kHz sampling rate.
• Internal Resistance: Features a low internal resistance of approximately 80mΩ, while other similar chips on the market typically have an internal resistance of over 110mΩ. This low internal resistance enables NTP8938 to deliver more outstanding sound quality in low-frequency bass performance.

2. Audio Processing Capability

• Built-in DSP: The chip integrates a built-in Digital Signal Processor (DSP) with multi-functional digital audio signal processing capabilities. It adopts floating-point arithmetic, which is more flexible compared to integer arithmetic.
• Sound Effect Adjustment: Equipped with 32 programmable double-quad filters, it can implement functions such as speaker compensation, Low-Pass Filter (LPF), High-Pass Filter (HPF), and DC cutting. It also supports an advanced parametric equalizer, allowing 32-band frequency-specific volume control within the audio range of 20Hz to 20,000Hz, enabling free adjustment of EQ points.
• Dynamic Range Control: Supports 3-band Dynamic Range Control (DRC), including Reinforced Sound (RS) DRC. It can perform differentiated sound effect adjustment to meet the requirements of high-fidelity sound output.
• Noise Reduction and Distortion Prevention: Utilizes Multi DRC + Post DRC + RS DRC power control for noise reduction, ensuring THD is lower than 1% and Signal-to-Noise Ratio (SNR) is higher than 95dB, thus effectively preventing sound distortion.

3. Other Features

Noise Suppression: Incorporates intelligent PWM switching and a soft-mute power meter NS feedback function, enabling fade-in/fade-out volume control and effectively suppressing noise generated during power-on/off, power-up/down, and mute operations.

Conversion Efficiency: Boasts a high conversion efficiency of up to 90%, which can effectively reduce energy loss.

Protection Mechanisms: Integrates multiple protection mechanisms, including Over-Current Protection (OCP), Over-Temperature Protection (OTP), and Over/Under-Voltage Protection (UVP), ensuring reliable and stable operation of the chip and the entire system.