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| NXP PNX0161 USB解决方案 | |||||
作者：NXP 文章来源：本站原创 点击数： 更新时间：2007-10-9  |
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PNX0161的主要性能,方框图以及采用PNX0161的GSM/MP3对接站的参考设计. The NXP Nexperia low-power USB audio device PNX0161 is a single-chip solution for digital, USB Audio-based headset accessories. It moves the core digital headset functions to the USB connector of a mobile/portable device, so the connector performs battery charging, PC synchronization, and headset. This small, low-power, and fully USB-compliant IC makes it easy to build digital-headset accessories for mobile/portable devices. It provides stereo playback and recording, with optional FM radio, across a USB link operations. In this way, manufacturers can deliver systems with just a USB connector, and thereby simplify their designs, shrink footprint, and reduce cost. Available in a small TFBGA88 package (7 x 7 mm), it builds on the USB standard to provide audio playback and recording functionality that is directly powered by the USB bus. The PNX0161 is fully compliant with USB specifications, so it provides plug-and-play operation with any USB host or On-The-Go (OTG) device. It supports USB Audio and Human Interface Device (HID) Classes, and requires very little power (~10 mA at Vbus) for playback mode. When connected to a USB host or OTG device, a headset based on the PNX0161 is powered by the USB physical bus. The host streams digital audio to the PNX0161-based headset accessory, synchronizes it to the local clock to prevent audio artifacts (sample rate conversion), and converts the resulting signal to analog. The headset accessory can capture audio from a microphone, line input, or tuner, and can convert it to a digital USB Audio stream that is subsequently streamed to the host. 高度集成的硬件和软件 The PNX0161 is a fully programmable solution that uses an ARM7TDMI core with an embedded DC/DC converter that is powered through the USB bus. There is 256 kB of on-chip NOR Flash, 32 kB of SRAM, and 32 kB of boot ROM. For added power savings, there is embedded power-management functionality, plus intelligent power and DMA control. The PNX0161 is specially designed to suppress noise coming from the host (e.g. GSM noise). The IC includes I2S input and output interfaces, a fast UART with DMA support, a master/slave I2C-bus interface, a 24-bit stereo ADC with programmable amplifier (for microphone, line input, and tuner input), a microphone bias block, and a 24-bit stereo DAC with a Class AB headphone amplifier for high-quality audio. Stereo recording and playback operate at a sample rate of 48 kHz. There is USB Audio streaming, full support for HID Class, USB Device Firmware Upgrade, and audio post-processing features like volume control and optionally other sound features. This small, low-power, and fully USB-compliant IC makes it easy to build digital-headset accessories for mobile/portable devices. It provides stereo playback and recording, with optional FM radio, across a USB link. 主要特性: Ñ Full-speed (12 Mbps) USB device fully compliant with USB host or USB OTG Ñ Single-chip solution for USB headset Ñ USB bus powered (Vbus at 5 V) Ñ Low power consumption (~10 mA at Vbus) Ñ High suppression of phone noise Ñ Stereo record and playback at sample rate of 48 kHz Ñ USB Audio and HID Classes Ñ FM radio via low-power analog bypass mode Ñ ARM7TDMI core with on-chip SRAM, ROM, and optional NOR Flash Ñ Wide range of connectivity and audio interfaces Ñ Intelligent power management Ñ Available in two versions: programmable Flash or cost-effective ROM Ñ 88-pin TFBGA package (7 x 7 mm with 0.5-mm pitch)  图1. PNX0161方框图.  图2. PNX0161的典型应用电路. PNX0161的详细性能请见数据表: http://www.nxp.com/acrobat_download/literature/9397/75015981.pdf 具有USB 2.0,音频流和麦克风紧凑的GSM/MP3对接站参考设计: This complete reference design provides everything a manufacturer needs to create a compact, medium-power docking station. It includes USB 2.0, audio streaming, and microphone functionality,and has a high-efficiency Class-D amplifier for superior sound from any set of speakers. 主要性能: Ñ Complete reference design - GSM-based docking station for mobile phone - MP3-based docking station for portable media player - PC speaker Ñ Superior speaker and microphone performance - NXP ARM7/DSP processor SAA9870 - NXP amplifier TDA8932BTW - Software compensation for speaker characteristics Ñ Built-in USB 2.0 codec - Audio streaming to PC, MP3 player, phone - Headset, charging, PC synchronization, andaccessory connection via a single standard interface Ñ Built-in microphone for hands-free conference calling with your phone or an Internet PC Ñ Integrated source selection Ñ Easy on-board interfacing via HID console Ñ Optional functions - FM radio - Audio streaming via 802.11 WLAN, Bluetooth® Ñ Small PCB footprint (55 x 60 mm) This NXP reference design reduces development costs and speeds time-to-market for systems that bring together the functions of a GSM-based docking station for a mobile phone, an MP3-based docking station for a portable media player, and a PC speaker. The design is built around two ICs, the NXP SAA9870 and the NXP TDA8932BTW. The SAA9870 is a single-chip solution that integrates a powerful ARM7 and a USB 2.0 codec with support for audio streaming and microphone functionality. The TDA8932BTW is a 2 x 15 W, high-efficiency, Class-D amplifier that delivers high-quality sound.  图3.参考设计方框图. http://www.nxp.com/acrobat_download/literature/9397/75016038.pdf |
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