For the sake of competition and differentiation, many handheld devices use a non-standard USB interface design, such as a mobile phone. But this does not affect the increasing integration of USB functions in handheld devices, including mobile phones. At least, before the wireless air interface technology matures, the most convenient way to obtain resources for handheld devices is still USB. Obviously, this is USB chip applications have opened up more markets.
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Not long ago, NXP introduced a full-speed USB 2.0 digital audio solution PNX0161, which uses the USB2.0 standard to transfer the main audio stream function to the USB connector of the main device to promote USB2.0 standardization of portable consumer products. Herbert Lee, Personal Sales Manager, NXP Semiconductors China, summarized the PNX0161 as a small (7mm x 7mm), ultra-low power, high-speed USB 2.0 single-chip solution that provides stereo playback and recording as well as FM radio.
Chip features: rich feature integration
The biggest feature of the PNX0161 is its rich integration including sound processing. The PNX0161's I/O control uses a cost-effective programmable ARM7 TDMI core with a built-in DC/DC converter powered by a USB bus. This solution is fully compliant with the USB specification and can be plug and play on any USB host or OTG device and supports USB audio and human interface devices (HID).
The PNX0161 has two built-in drivers, the Audio Device Class and the Human InteRFace Device, the former responsible for the USB music transfer driver and the latter for the peripheral I/O interface driver. In terms of sound design, it supports programmable Flash or ROM versions. The former uses built-in DSP software, and the system manufacturer can preset the equalizer to eliminate echo, thus obtaining good sound quality and multiple sound modes. Determine the mode and replace it with a low-cost ROM when the product is in production.
Power consumption is the biggest challenge for providing digital audio to headphones, and Herbert Lee believes that the PNX0161 is currently the first solution to effectively solve this problem. With built-in power management and intelligent power control, the PNX0161 playback mode requires very little power and consumes only 10 mA at 5V. At the same time, the PNX0161 has a built-in 24-bit DAC and ADC conversion module, allowing for direct connection of digital For headphone applications, a Class AB amplifier is also built in. In a chip featuring audio processing, if power management and amplifiers are built in, noise suppression will be the primary problem. The PNX0161 uses a low noise amplifier (LNA) + programmable gain amplifier (PGA) design to effectively reject noise. Of course, NXP also offers an "optional software" approach to noise.
Product definition: innovation integration and value added
Although the PNX0161 integrates a wealth of features, these features do not seem to exceed the capabilities of system chips in high-end handheld devices. How do you understand the definition of the NXP chip? Is it an alternative to existing products, a standardized interface or a value-added option for existing systems?
According to Herbert Lee, the PNX0161 is an innovative concept-led product that was originally intended to unify multiple interfaces of existing handheld devices using the USB specification. Based on this, the low-power design makes it more suitable for handheld devices. It is defined as a USB chip for handheld devices that integrates a sound processing module. The USB specification is emphasized because it is both a transport interface and a charging interface. At present, mobile phones have many interfaces, such as charging, USB, card reading and so on. NXP wants to integrate multiple interfaces into a single interface. USB is a mature interface for existing PC or NB device resources, and is best suited as a unified interface to integrate existing device interfaces. And a unified interface can make handheld devices lighter, thinner and shorter.
Herbert Lee also said that although some high-end devices such as smart phones have the same function, they are more expensive, like music phones that use a coprocessor to implement audio functions, and almost all portable system vendors In its product planning, it emphasizes the application of USB. The latest statistics from In-Stat show that by 2011, Hi-Speed ​​USB will dominate the market as a local interface on portable products, and the market demand for this product will It has reached 2.7 billion units, with a compound annual growth rate of 24.4%. NXP believes that the PNX0161 will meet this trend while reducing implementation costs.
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