TI 便携式媒体播放器解决方案 - DIY编程器网

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便携式多媒体点唱机，有时也被称为音频/视频点唱机，便携式媒体播放器或便携式视频播放器，为消费类和消费类电子制造厂商提供了具有巨大利益的市场。这些器件都是基于硬盘驱动器的，能够存储几个小时的内容，为当今忙碌生活的人们提供娱乐。尽管这些产品的相关市场还很小，但是,它的市场潜力却是很大的。

便携式媒体组成器件为：

TS5V330/TS3V330：视频开关
SN74AVCXT245/74LVCXT245：双电源电平转换器
SN74LV4320A：CompactFlash接口收发器
TLV320AIC32/TLV320AIC31：低功耗、立体声音频编解码器
PCM3792A：低功耗、立体声音频编解码器
TSC2100/TSC2102: High-Performance “Smart” Touch- Screen Controllers w/ Integrated Low-Power Audio Converters
TSC2100/TSC2102：集成了低功耗音频转换器高性能”智能”触摸屏控制器
TSC2301/TSC2302：集成了低功耗音频转换器高性能”智能”触摸屏控制器
SN74AVCA406/SN74AVCA406L：MMC，SD，Memory Stick，SmartMedia和xD-Picture Card收发器

下图为便携式多功能数字媒体设备方框图

下面对各个元器件的性能和方框图进行描述：

Video switches in the TS switch product family provide low differential gain and phase, making these switches ideal for composite and RGB video applications. TS video switches also offer the wide bandwidth and low crosstalk required to support high-frequency video applications.
Key Features
*Low differential gain and phase (3-V DG = 0.82%, DP = 0.1 degrees typ) (5-V DG = 0.64%, DP = 0.1 degrees typ)
*Wide bandwidth (BW = 300 MHz min)
*Low crosstalk (3-V XTALK = –80 dB typ) (5-V XTALK = –63 dB typ)
*Low-power consumption (ICC = 3 A max)
*Bidirectional data flow, with near-zero propagation delay
*Low ON-state resistance (ron = 3 typ)
*Rail-to-rail switching on data I/O ports (0 to VCC)

*Ioff supports partial-power-down mode operation
*Suitable for both RGB and composite-video switching
Applications
*Composite and RGB video

多路视频信号从视频处理器到VGA卡两个外接视频端口

Dual-supply level shifters are the ideal solution for bidirectional level translation. These devices have two separate VCC supplies, one for each port (VCCA and VCCB), which gives them flexibility to operate in mixed-mode applications. These dual-supply devices allow for bidirectional level translation between different voltage nodes from 1.2 V to 3.6 V and 1.65 V to 5.5 V. TI also offers a wide range of bit-width options.
TI’s Dual-Supply Level-Translation Portfolio

扩展系列双电源电平转换设备

This CompactFlash (CF) interface chip is designed to provide a singlechip solution for CF card interfaces. Separate VCC rails for the system bus side and the CF connector bus side allow voltage-level shifting.This is helpful for interfacing between a core chipset, which may operate
from 3.3 V down to 1.65 V, and CF cards with 3.3-V or 5-V supply voltages.
Key Features
*Level translation supports both 3.3- and 5-V CompactFlash cards
*High degree of integration

*Schmidt-trigger inputs for CompactFlash control signals
*Ioff and /MASTER_EN (shutdown) pin
*Internal decode logic for direction control (DIR)
*Robust ESD protection (+8-kV HBM) on card pins
Applications
*PDAs
*Handheld scanners
*Set-top boxes
*Network equipment

SN74LV4320A典型应用示意图

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