TI 公司的THS7319是集成了滤波器的非常低功耗的单电源(2.6V-5V)三路视频放大器.THS7319集成了三路增强分辨率(ED)的滤波器,具有三阶Butterworth特性.可用作DAC重建滤波器或ADC抗混淆滤波器.THS7319在3.3V时的总静态电流仅为3.4mA,非常适合以电池为能源的应用,如PMP,数码相机,手机视频输出缓冲和USB/手提低功耗视频缓冲.本文介绍了THS7319主要特性,方框图, 标准测试电路以及多种应用电路,包括单电源DC耦合输入/DC耦合输出视频线路驱动器,DC耦合编码器/DAC和DC耦合线路驱动器的THS7319系统, 驱动AC耦合视频线路的DC输入系统.此外还介绍了THS7319EVM评估板电路图和评估板材料清单.
Fabricated using the revolutionary, complementary Silicon-Germanium (SiGe) BiCom3X process, the THS7319 is a very low-power, 2.6-V to 5-V single-supply, three-channel, integrated filter video buffer. This device is ideal for battery-powered applications where size and power are critical parameters. Total quiescent current is only 3.4 mA at 3.3 V and can be reduced to 0.15 µA while disabled.
The THS7319 incorporates three enhanced definition (ED) filter channels with third-order Butterworth characteristics. These filters are useful as digital-to-analog converter (DAC) reconstruction filters or as analog-to-digital converter (ADC) anti-aliasing filters supporting 480p/576p YPBPRand RGB video. The THS7319 is also ideal for oversampled systems that produce standard-definition (SD) signals including CVBS, S-Video, 480i/576i YPBPR, YUV, and RGB.
The THS7319 is designed for dc-coupled inputs. To mitigate any DAC/encoder termination interaction, the input impedance is a very high 2.4 M. The 150-mV output level shift allows for a full sync dynamic range at the output with a 0-V input that prevents sync crushing. The rail-to-rail output stage supports both ac and dc line driving.
The THS7319 is offered in a RoHS-compliant ultra-small 9-ball MicrostarCSP package that measures 1.5-mm × 1.5-mm × 0.35-mm.
THS7319主要特性:
Very Low Total Quiescent Current: 3.4 mA at 3.3 V
0.15-µA Total Disabled Supply Current
Third-Order Butterworth Low-Pass Filters:
-1 dB at 17 MHz
-3 dB at 20 MHz
21-dB Attenuation at 43 MHz
Supports 480p/576p YPBPRor RGB Video
Supports CVBS, S-Video, 480i/576i YPBPR, or YUV in Oversampled Systems
DC-Coupled Input with 150-mV Output Shift
Built-in 6-dB Gain (2 V/V)
+2.6-V to +5-V Single-Supply Operation
Rail-to-Rail Output Allows AC or DC Output Coupling
Low Differential Gain/Phase of 0.05%/0.03°
Ultra-Small, 1.5-mm × 1.5-mm × 0.35-mm, MicrostarCSP™ 9-Ball Package
THS7319应用:
Personal Media Players
Digital Cameras
Cellular Phone Video Output Buffering
USB/Portable Low-Power Video Buffering
图1.THS7319功能方框图
图2.THS7319标准测试电路
图3.THS7319单电源DC耦合输入/DC耦合输出视频线路驱动器
图4.典型的THS7319系统:DC耦合编码器/DAC和DC耦合线路驱动器
图5.驱动AC耦合视频线路的典型THS7319DC输入系统
图6.THS7319 EVM评估板电路图
THS7319 EVM评估板材料清单(BOM):
