Manufacturers of portable consumer electronic devices face many challenges. They must develop cost-effective, high-performance and versatile audio solutions while extending battery life. On the other hand, manufacturers have to shorten development time in order to be the first to introduce new products in the market. With the development of ultra-low-power codecs with embedded mini-DSPs and powerful graphical programming tools, manufacturers are now able to respond to these complex needs.
For systems that require stand-alone codecs and systems that embed embedded analog I/O in a baseband or application processor chip, these devices offer low-power audio solutions with ultra-low power and processing power. . The graphical programming environment and rich software link library can shorten the development time of an application, which is much less than the time required for development in a general programming environment.
In terms of low-power operation, many new generation low-power codecs can operate analog and digital cores from a single 1.5V to 1.8V. If the digital core is operated at voltages as low as 1.26V, further Reduce power consumption. Many devices have a low-power mode of operation, however, additional power-conditioning options allow designers to adjust power based on individual configuration and processing options used during recording and playback, which helps designers minimize power consumption. The flexibility is optimized based on the number of channels input and output, output drive demand, sampling rate, signal-to-noise ratio (SNR) performance required for input and output, and processing functions used.
As shown in Figure 1, the power consumption of the codec can be adjusted through this function for different audio reproduction modes (incoming call, SMS ringtone, voice communication and music playback), different I/O configurations (mobile phone and Mobile phone operation) and different signal processing requirements (low noise and high noise communication environment) can achieve the best performance. For analog bypass operation modes that do not require conversion, PLL and PLL-free operation, or Class D and Class AB headphone driver configurations, power conditioning control provides additional configuration options that are controlled via I2C or SPI bus Manage.
Figure 1. The increase in SNR and voltage will increase power consumption. Users can adjust power according to their application and system requirements.
Power regulation can significantly extend the battery life of portable audio devices. The low-power mode of operation enables ultra-low-power codecs with signal processing to reduce the power consumption of incoming/sound ringtones to less than 5mW and reduce the power consumption of 8kHz or 16kHz voice communication to less than 7mW while maximizing The power consumption of the sound quality 44.1kHz stereo headphones music playback is reduced to below 10mW.
Combined with ultra-low power data conversion and low-power signal processing, the general system architecture with application processor and codec can achieve significant energy-saving effect on the same chip. In these architectures, ultra-low-power codecs can perform some or all of the audio processing functions of the application processor.
Systems with baseband chips or application processor chips have analog input and/or output capabilities. A codec with signal processing provides a low-cost, short-to-develop solution that integrates other functions or functions without the need to reprogram or replace an existing baseband or application processor. A powerful tool to extend battery life is the new ultra-low power codec with embedded mini DSP. These devices and their powerful graphical programming tools provide low-power audio solutions for a wide range of portable audio processing and communication system architectures. Among them, the power consumption of stereo playback can be as low as 2.4mW, which is achieved by programming in a graphical software environment, and also simplifies the manufacturer's programming.
The competition in the portable consumer electronics market is fierce and the pace of change is quite fast. Fast time-to-market and ultra-low power consumption shorten the manufacturer's design process and help them develop differentiated products. The ultra-low-power audio converter with integrated DSP and the graphical software development environment that helps accelerate programming are the competitive advantages.
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