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| TI THS7314视频放大器应用方案 | |||||
作者：TI 方案来源：TI 点击数： 更新时间：2007-12-27  |
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The THS7314, THS7315 and THS7316 offer design flexibility as the inputs can be configured for either AC- or DC-coupled applications. In addition, unlike typical solutions, the family can support a single 3-V to 5-V supply, eliminating the need for a separate 5-V supply. The devices rail-to-rail output allows AC- or DC-output coupling so that designers can use 3.3-V supply without headroom issues. The ability for each channel to drive two video lines, or 75-ohms loading, allows for maximum flexibility as a video line driver.  Fabricated using the revolutionary complementary silicon-sermanium (SiGe) BiCom3 process, the THS7315 is a low-power, single-supply, 3-V to 5-V 3-channel integrated video buffer. It incorporates a 5th-order Butterworth filter that is useful as a digital-to-analog converter (DAC) reconstruction filter or an analog-to-digital converter (ADC) anti-aliasing filter. The 8.5-MHz filter is a perfect choice for SDTV video, including Composite Video Baseband Signals (CVBS), S-Video, Y’U’V’, G’B’R’ (R’G’B’), and Y’P’BP’R 480i/576i. The THS7315 inputs can be either ac- or dc-coupled. The 230-mV output level shift allows for a full sync dynamic range at the output with 0 V input. The ac-coupled modes include a transparent sync-tip clamp option for CVBS, Y, and GBR signals with bottom-level sync. AC-coupled biasing for C/PB/PR channels can easily be achieved by adding an external resistor to VS+. The THS7315 is the perfect choice for all output buffer applications. Its rail-to-rail output stage with 5.2-V/V gain allows for both ac and dc line driving, making it a perfect choice for DaVinci processors. The ability for each channel to drive two video lines, or 75-ohm loading, allows for maximum flexibility as a video line driver. The 15.6-mA quiescent current at 3.3 V also makes it an excellent choice for USB-powered, portable, or other power-sensitive video applications The THS7315 is available in a small SOIC-8 package that is lead-free and compliant with green requirements. 主要特性: Three SDTV Video Amplifiers for CVBS, S-Video, YPBPR 480i/576i, YUV, or GBR (RGB) Integrated Low-Pass Filters: 5th-Order, 8.5-MHz (-3dB) Butterworth -1dB Passband Bandwidth at 7 MHz 47 dB Attenuation at 27 MHz Versatile Input Biasing: DC-Coupled with 230-mV Output Shift AC-Coupled with Sync-Tip Clamp Allows AC-Coupled With DC-Biasing Built-in 5.2 V/V Gain (14.3 dB) +3-V to +5-V Single Supply Operation Rail-to-Rail Output: Output Swings Within 100 mV of the Rails, Allowing AC- or DC-Output Coupling Supports Driving Two Lines per Channel Low Total Quiescent Current: 15.6 mA at 3.3 V Low Differential Gain/Phase of 0.2%/0.3° Lead-free, Green SOIC-8 Package APPLICATIONS Set Top Box Output Video Buffering PVR/DVDR Output Buffering USB/Portable Low-Power Video Buffering 下图为放大器的方框图.  THS7315EVM评估板性能介绍: The THS7315EVM is an evaluation module for the THS7315 in the D (8-lead SOIC) package. The THS7315EVM is designed to demonstrate the functionality and versatility of the THS7315. The EVM is ready for power, signal source, and test instruments. The EVM is configured with 75 ohm input and output termination. 评估板主要特性: Configured with 75 ohms input/output impedance Single Supply: +3 V to +5 V Connectors: Vs+, GND, INPUT, OUTPUT and test points Input and Output signals are via RCA and BNC connectors  上图是THS7315D EVM 电路图 THS7315EVM 材料清单(BOM):  http://focus.ti.com/lit/ds/symlink/ths7315.pdf |
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