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CXAR41331: An active noise cancellation driver chip designed specifically for TWS earphones, perfectly integrating high sound quality and low power consumption

            With the rapid development of the true wireless stereo (TWS) headphone market, users have increasingly high requirements for sound quality, noise reduction effect, and battery life. JTM-IC (official website:jtm-ic.com）The CXAR41331 launched is an active noise cancellation (ANC) driver chip optimized specifically for TWS earphones. It uses fully analog circuits to achieve noise cancellation function, with low power consumption, high integration, and flexible control methods. It is an ideal choice for the new generation of high-end TWS earphones.tEZ嘉泰姆

1、 Product Overview

        CXAR41331 is a high-performance, low-power active noise cancelling headphone driver chip suitable for feedforward noise cancelling architecture. The chip integrates adjustable gain microphone amplifiers, filtering operational amplifiers, headphone driver amplifiers, and audio bypass switches, supports multiple control modes, and has excellent power management and signal processing capabilities.tEZ嘉泰姆

2、 Core Features

·     Feedforward active noise reductionThe maximum noise reduction frequency reaches 3kHztEZ嘉泰姆

·     Ultra low power designStereo ANC power consumption only 5mW@1.5V Static current<1μ AtEZ嘉泰姆

·     High quality audio output: Supports 24mW output, THD+N as low as 0.1% (32Ω)tEZ嘉泰姆

·     Integrated audio bypass switchMusic can still be played normally when the battery is lowtEZ嘉泰姆

·     Multiple control methods: Supports buttons, sliding switches, or I² C ControltEZ嘉泰姆

·     OTP programmableSupport parameter tuning during the production processtEZ嘉泰姆

·     package form：QFN20， Suitable for compact designtEZ嘉泰姆

3、 Pin Function Description

CXAR41331 adopts a 20 pin QFN package, with the main pin functions as follows:tEZ嘉泰姆

tEZ嘉泰姆

Tip: This product is an electrostatic sensitive device, and it is recommended to take anti-static measures during production and welding processes.tEZ嘉泰姆

4、 Electrical characteristics and working conditions

4.1. Extreme working conditions

4.2. Recommended working conditions

·    Power supply voltage VDD: 1.0V~1.8VtEZ嘉泰姆

·    Negative pressure charge pump output VREG: -1.8V~-0.7VtEZ嘉泰姆

·    Working temperature: -20 ℃~+85 ℃tEZ嘉泰姆

4.3. Typical power consumption (VDD=1.5V)

·    Feedforward ANC mode: 9.5mWtEZ嘉泰姆

·    In ECO mode: 7.2mWtEZ嘉泰姆

·    Off mode current:<1μ AtEZ嘉泰姆

5、 Detailed explanation of system functional modules

5.1. Audio line input

The chip has a built-in monaural audio input amplifier, supports EQ sound quality adjustment, and has a signal-to-noise ratio of up to 121dB (high-quality mode), suitable for high fidelity music playback.tEZ嘉泰姆

5.2. Microphone input

The microphone gain can be adjusted in 0.5dB steps within the range of 0dB~31dB, supporting three OTP repeated adjustments to adapt to different microphone sensitivities.tEZ嘉泰姆

5.3. Filtering operational amplifier

Built in single-stage operational amplifier, used to construct a first-order noise reduction filtering network, supporting high-quality mode and ECO mode switching, balancing performance and power consumption.tEZ嘉泰姆

5.4. Headphone driver amplifier

Supports 16Ω ~32Ω Load, maximum output power of 60mW (16Ω @ 1.8V), with high power supply rejection ratio (100dB) and low distortion characteristics.tEZ嘉泰姆

5.5. Audio bypass switch

When the battery is low, it automatically switches to bypass mode to ensure uninterrupted music playback and improve user experience.tEZ嘉泰姆

5.6. Negative pressure charge pump

Integrated charge pump module, supporting external 1μ F+10μ F-capacitor configuration provides stable negative pressure power supply.tEZ嘉泰姆

6、 Control mode and operation logic

CXAR41331 supports multiple control modes to meet different product design requirements:tEZ嘉泰姆

·    Full sliding modeControl power, ANC, and monitoring modes through sliding switchestEZ嘉泰姆

·    Sliding modeSupport button enabled monitoring modetEZ嘉泰姆

·    Key modeSingle key implementation for power on/off and mode switchingtEZ嘉泰姆

·    Play only mode (PBO)Disable ANC and only retain music playback functiontEZ嘉泰姆

·    I² C control modeSupports register configuration, suitable for smart headphone systemstEZ嘉泰姆

7、 OTP register and tuning function

The chip has built-in OTP memory and supports three burning of microphone gain, mode configuration, and other parameters. The debugging process supports I² C interface or audio jack method, convenient for mass production debugging.tEZ嘉泰姆

8、 Application scenarios

·    TWS active noise cancelling headphonestEZ嘉泰姆

·    Neck mounted noise cancelling headphonestEZ嘉泰姆

·    Wired ANC earphones (Type-C/Lighting interface)tEZ嘉泰姆

·    Intelligent voice earphones and hearing aidstEZ嘉泰姆

9、 Encapsulation information

CXAR41331 is packaged in QFN20 and measures 4.0mm in size; 4.0mm × 0.8mm， Suitable for high-density PCB layout and reflow soldering process.tEZ嘉泰姆

10、 Summary

          CXAR41331, as an important solution for JTM-IC in the TWS audio field, provides a reliable hardware foundation for the next generation of smart headphones with its high integration, low power consumption, flexible control mode, and excellent sound quality performance. JTM-IC（jtm-ic.com）Committed to providing customers with full chain audio technology support from chips to systems, helping brand customers create more competitive audio products.tEZ嘉泰姆

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