CXAR41332/A is an active noise reduction driver chip based on analog circuits, designed specifically for headphones with strict requirements for power consumption and cost. The chip integrates a gain adjustable microphone amplifier, with two filtering amplifiers for each channel. Users can flexibly configure feedforward, feedback, or hybrid noise reduction modes through external circuits to meet diverse product needs.
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[ CXAR41332，CXAR41332A ]"
CXAR41332/A Active Noise Reduction Earphone Driver Chip: High Performance, Low Power Audio Solution
In today's audio equipment market, active noise cancellation (ANC) technology has become a core feature of high-end headphone products. As a leading supplier of integrated circuit solutions, JTM-IC (official website:jtm-ic.com）The CXAR41332/A active noise cancelling headphone driver chip launched has become an ideal choice for various in ear and head mounted headphones due to its excellent performance, high integration, and ultra-low power consumption. This article will comprehensively analyze the technical characteristics, application scenarios, and design advantages of the chip, helping audio product developers achieve a better noise reduction experience.
1、 Chip Overview
CXAR41332/A is an active noise reduction driver chip based on analog circuits, designed specifically for headphones with strict requirements for power consumption and cost. The chip integrates a gain adjustable microphone amplifier, with two filtering amplifiers for each channel. Users can flexibly configure feedforward, feedback, or hybrid noise reduction modes through external circuits to meet diverse product needs.
2、 Core functions and technological advantages
2.1. Multi mode active noise reduction architecture
CXAR41332/A supports three ANC topologies: feedforward, feedforward, and hybrid. In feedforward mode, the noise reduction frequency can reach 3kHz, effectively suppressing mid to high frequency environmental noise; In the feedback mode, the noise reduction frequency reaches 1kHz, suitable for low-frequency noise control; The hybrid mode combines the advantages of both to achieve full frequency band noise reduction, suitable for high-end headphone applications.
2.2. Integrated audio bypass switch
To solve the problem of insufficient battery power, the chip is equipped with an intelligent bypass switch. When the battery voltage is detected to be too low, the ANC module automatically shuts down and switches to bypass mode to ensure that the headphones can still play music normally without affecting the user experience.
2.3. Ultra low power design
Under 1.5V power supply conditions, the stereo ANC has a power consumption of only 10mW and a static current of less than 1μ A, greatly extending the battery life of wireless headphones, making it particularly suitable for power sensitive wearable devices.
2.4. High fidelity audio output
The chip supports 2× 24mW stereo output, total harmonic distortion plus noise (THD+N) as low as 0.1% (32Ω load, 1.5V power supply), ensuring clear and pure audio output, meeting high-resolution audio requirements.
2.5. Flexible control and indication functions
CXAR41332/A supports buttons, sliding switches, and I² Three control methods for C communication facilitate product interface design. In addition, the chip has a low-power LED indicator function and can adjust the LED driving strength to enhance user interaction experience.
2.6. Production convenience and packaging options
Perform OTP (one-time programmable) tuning through audio interface to simplify production process and improve product consistency. The chip offers two packaging forms, QFN32 and QFN40, to meet different space and heat dissipation requirements.
3、 Detailed functional module analysis
3.1 Audio line input
The chip is equipped with left and right channel audio input amplifiers, supporting users to develop EQ functions to improve sound quality. Under 1.5V power supply conditions, the signal-to-noise ratio (SNR) can reach up to 119dB (high-quality mode), ensuring high fidelity transmission of input signals.
3.2 Microphone input and gain adjustment
Built in microphone gain amplifier, with a gain range of 0dB to 31dB and a step size of 0.5dB. It supports three repeated OTP adjustments and is suitable for flexible configuration of microphones with different sensitivities.
3.3 Operational amplifiers and filtering networks
· CXAR41332Integrated single-stage operational amplifier, suitable for first-order noise reduction filtering networks, mainly used for feedforward ANC design.
· CXAR41332AIntegrated dual stage operational amplifier, supporting second-order filtering network, suitable for feedforward or hybrid ANC design.
3.4 Headphone driver amplifier
Supports both single ended and differential output modes, capable of driving 16Ω Or 32Ω Load, output power up to 150mW (differential mode, 16Ω); Load) to meet the driving requirements of different headphone units.
3.5 Microphone power supply and negative pressure charge pump
Built in microphone powered charge pump, capable of generating MICS output from VDD, with a typical no-load voltage of 2.3V (VDD=1.5V). The negative pressure charge pump generates VNEG through an external 1μ F capacitor, providing negative power to the audio module.
4、 Working mode and control logic
CXAR41332/A supports multiple operating modes, including:
· OFFThe chip is completely turned off
· ANCActive noise reduction mode
· MONITORMonitoring mode, capable of amplifying environmental sounds
· PBOOnly play mode, disable ANC function
Users can use MODE_SCL and ANC_SDA pins to slide, press buttons, or I² C control, flexible adaptation to different product forms.
5、 OTP tuning and I² C Communication
The chip supports I² C interface or audio jack for OTP adjustment, facilitating parameter calibration during the production phase. I² The C interface supports dual slave addresses (0x60/0x62), allowing for parallel communication between multiple chips.
6、 Application reference circuit
CXAR41332/A provides a complete reference design, including left and right channel filtering networks, microphone bias circuits, charge pump configurations, etc., to help developers quickly achieve productization.
7、 Typical application scenarios
· In ear active noise cancelling headphones
· Head mounted noise cancelling headphones
· Wireless Bluetooth ANC earphones
· Esports gaming headphones
· Professional monitoring equipment
8、 Pin arrangement and function
9、 Conclusion
CXAR41332/A is an ideal choice for active noise cancelling headphone design due to its comprehensive functionality, excellent performance, and high integration. JTM-IC is committed to providing reliable integrated circuit solutions and technical support to global customers, helping audio brands stand out in market competition.
For more technical details, reference designs, or procurement information about CXAR41332/A, please visitJTM-IC official websiteOr contact our technical team.
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