CXAR41335 is a low-power audio codec that integrates four inputs and two outputs. It has a powerful digital signal processing engine and supports functions such as filtering, level control, signal mixing, and real-time monitoring. This chip supports single ended analog microphone input and up to four digital microphone inputs. The entire path from analog input to DSP core and then to analog output has been deeply optimized for low latency, making it particularly suitable for active noise reduction applications with strict requirements for audio quality, power consumption, and latency. Adopting QFN48 packaging, a complete headphone solution can be built with only a small number of peripheral components
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[ CXAR41335 ]"
CXAR41335: Breakthrough low-power audio codec, redefining high fidelity noise cancelling audio experience
In today's rapidly developing portable audio devices, consumers have higher requirements for audio quality, noise reduction effect, and battery life. CXAR41335, as a low-power codec designed specifically for high-end audio applications, integrates a high-performance audio processing engine, flexible input-output configuration, and advanced power management technology, providing a complete solution for applications such as active noise cancelling headphones and portable audio devices. This article will comprehensively analyze the technical features, system architecture, and design points of CXAR41335, helping developers create the next generation of audio products.
1、 Chip Overview: High Integration Audio Processing Platform
CXAR41335 is a low-power audio codec that integrates four inputs and two outputs. It has a powerful digital signal processing engine and supports functions such as filtering, level control, signal mixing, and real-time monitoring. This chip supports single ended analog microphone input and up to four digital microphone inputs. The entire path from analog input to DSP core and then to analog output has been deeply optimized for low latency, making it particularly suitable for active noise reduction applications with strict requirements for audio quality, power consumption, and latency. Adopting QFN48 packaging, a complete headphone solution can be built with only a small number of peripheral components.
2、 Core Features and Advantages
2.1. High performance audio processing
· 24 bit high-precision ADC and DAC, supporting 102dB SNR (PGA+ADC path) and 107dB combined signal-to-noise ratio;
· Integrated dual second-order filter, limiter, volume control, and mixer, supporting fully programmable audio processing;
· Ultra low latency architecture, with an analog-to-digital conversion delay of only 38 μ s, ensuring real-time noise reduction effect.
2.2. Flexible interface configuration
· Supports 4 single ended analog inputs (configurable as microphone or linear input);
· Dual stereo digital microphone input, compatible with mainstream digital microphone solutions;
· Stereo analog output supports single ended or differential mode, and can be configured as linear output or headphone driver.
2.3. Wide range clock and sampling rate
· The serial data port is compatible with I2S, left aligned, right aligned, and TDM modes;
· The sampling rate supports 8kHz to 192kHz, meeting the full scene requirements from speech to high-resolution music;
· Built in PLL and asynchronous sampling rate converter, supporting a full clock range of 8MHz to 27MHz.
2.5. Advanced power management
· Multi voltage domain design: Analog and digital I/O support 1.8V-3.3V, DSP core supports 1.1V-1.8V;
· A typical ANC solution has a power consumption of only 15mW, greatly extending the battery life of portable devices;
· Supports multiple power-saving modes and can dynamically adjust power consumption strategies according to application scenarios.
2.6. Dual control interface
· Support I2C and SPI control interfaces, provide register configuration and DSP program loading;
· Equipped with self starting mode, it can automatically load configuration parameters through external EEPROM.
3、 Internal architecture and signal pathways
The internal architecture of CXAR41335 includes three major modules: analog front-end, digital processing engine, and output driver
· analog front-endFour single ended analog inputs equipped with programmable gain amplifiers, supporting microphone bias and linear input; The stereo ADC adopts a 24 bit high-precision architecture to ensure input signal quality.
· Digital Processing EngineBuilt in programmable DSP core, supports parallel execution of 32 instructions, and implements processing such as filtering, mixing, volume control, and limiting; Support low latency direct path to meet real-time noise reduction requirements.
· Output driverStereo DAC supports single ended or differential output and can directly drive headphone loads; Under 1.8V power supply, 32Ω The output power of the load reaches 8.4mW (single ended) or 32.5mW (differential).
4、 Key performance parameters
4.1. Power Characteristics
· AVDD/IOVDD：1.8V-3.3V，DVDD：1.1V-1.8V；
· Typical working current: approximately 15.5mW at a sampling rate of 192kHz;
· The power consumption in power-off mode is as low as 1μ W, greatly improving standby life.
4.2. audio performance
· ADC dynamic range: 102dB (A-weighted);
· DAC output: single ended 0.53Vrms (1.8V), differential 1.0Vrms (1.8V);
· Earphone driver: 32Ω Output 32.5mW (differential, 1.8V) under load, THD+N<0.1%.
4.3. Digital interface
· Supports I2C (standard/fast mode) and SPI control interfaces;
· The serial data port supports 2/4/8 channel TDM mode for easy system expansion.
5、 Typical application scheme
5.1. Active noise cancelling headphones
By utilizing the low latency characteristics of CXAR41335 and multiple microphone inputs, a feedforward/feedback hybrid noise reduction system is constructed, and an adaptive noise reduction algorithm is implemented through DSP to enhance the noise reduction effect and user experience.
5.2. Bluetooth audio device
As an audio co processor for Bluetooth SoC, it provides high-quality audio encoding, decoding, and sound processing, supporting high-definition audio transmission and low-power operation.
5.3. Personal navigation and digital photography equipment
By utilizing its low power consumption and small size characteristics, it provides high-quality audio input and output capabilities for portable devices.
Attention should be paid to the following during design:
· It is recommended to use low-noise LDO for analog power supply and strengthen decoupling design;
· The digital microphone clock needs to maintain low jitter to ensure sampling accuracy;
· The headphone output wiring should be kept away from digital signals to reduce crosstalk.
6、 Key points of system design and debugging
6.1. Clock system design
Recommend using a 12.288MHz crystal oscillator to generate the required clock in conjunction with on-chip PLL; If an external clock is used, a 12.288MHz or 24.576MHz clock signal can be directly input.
6.2. Power timing management
AVDD should be powered on before or at the same time as IOVDD; When cutting off power, it is necessary to mute the output before turning off the power to avoid popping sounds.
6.3. Control interface configuration
· I2C mode is the default control mode. To switch to SPI mode, the SS pin needs to be pulled down three times in a row;
· In self starting mode, the chip can automatically load configurations from external EEPROM, simplifying system initialization.
7、 Packaging and Production Suggestions
CXAR41335 is packaged in QFN48 and has a size of 6.0mm× 6.0mm× 0.75mm， The pin spacing is 0.4mm. There are exposed solder pads at the bottom of the package, and it is recommended to connect them to the ground layer through vias to improve heat dissipation performance and soldering reliability. As an electrostatic sensitive device, it is necessary to take comprehensive anti-static measures during production, welding, and operation.
8、 Conclusion: Choosing JTMIC as the New Benchmark for Audio Technology
CXAR41335 provides a powerful technological foundation for modern audio devices with its low power consumption, low latency, and high integration. Whether it's high-end noise cancelling headphones, Bluetooth audio devices, or various portable audio products, this chip can help developers achieve excellent audio performance and differentiated product experiences.
As JTMIC（jtm-ic.com）We provide customers with comprehensive technical support, reference design, and original stock supply for the highly recommended audio codec chips. Welcome to visit the official website to learn more about product details and technical information, and work together with JTMIC to create a new future of audio technology!
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