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ST TSH120视频缓冲放大方案

2017-11-24 04:13 PM| 发布者: admin| 查看: 715| 评论: 0

摘要: ST公司的 TSH120是视频缓冲放大器,包罗有内部增益为6dB的电压负反馈放大器,轨到轨输出,输入偏置和SAG修正.内部另有能衰减27MHz寄生的重建滤波器. TSH120有非常低的功耗,可提供待机模式,工作电压从2.2V到5.5V,主要用 ...
ST公司的 TSH120是视频缓冲放大器,包罗有内部增益为6dB的电压负反馈放大器,轨到轨输出,输入偏置和SAG修正.内部另有能衰减27MHz寄生的重建滤波器. TSH120有非常低的功耗,可提供待机模式,工作电压从2.2V到5.5V,主要用于照相手机,数码相机,数字摄像机和STB与DVD视频输入.本京电港论坛文章先容了TSH120的主要特点, 带输出电容和不带输出电容的电路原理图纸, TSH120评估板电路图以及评估板质料清单(BOM).

The TSH120 is a video buffer that includes a voltage feedback amplifier with an internal gain of 6dB, rail-to-rail output, internal input biasing and SAG correction. A power down function offers a sleep mode with ultra low consumption. The TSH120 also features an internal reconstruction filter in order to attenuate the parasitic 27MHz frequency from the clock of the video DAC.

TSH120主要特性:
■Very low consumption
■Standby mode available
■Internal reconstruction filter
■Internal gain of 6dB
■Rail-to-rail output
■Tested with +2.5V and +3.3V single supply
■Operation supply from +2.2V to +5.5V
■SAG correction
■Excellent video performance
Differential gain 0.5%
Differential phase 0.5°
Group delay=10ns
■Specified for 150load
■Input DC level shifter
■Min. and max. limits are tested in full production

TSH120应用:
■Camera phones
■Digital still camera
■Digital video camera
■Set-top box and DVD video outputs



图1{京电港论坛}.TSH120带输出电容的电路图



图2{京电港论坛}.TSH120不带输出电容的电路图

{方案}TSH120的带SAG修正的视频缓冲器和滤波器
Video buffer and filter with SAG correction based on the TSH120
This evaluation board is based on the TSH120 video buffer. The TSH120 includes a voltage feedback amplifier with an internal gain of 6 dB, rail-to-rail output, internal input biasing and SAG correction. A power-down function provides a sleep mode with ultra low power consumption.

TSH120评估板特性:
■Very low consumption in active and standby mode
■Internal reconstruction filter
■Internal gain of 6 dB
■Rail-to-rail output
■Operating supply voltage from +2.2 V to +5.5 V
■SAG correction
■Excellent video performance
Differential gain: 0.5 %
Differential phase: 0.5°
■Group delay=10 ns
■Specified for 150 load
■Input DC level shifter



图3{京电港论坛}.TSH120评估板外形实物图




图4{京电港论坛}.TSH120评估板电路图
TSH120评估板材料清单(BOM):



详情请复制打开此衔接所在:
http://www.st.com/stonline/products/literature/ds/13536/tsh120.pdf

http://www.st.com/stonline/books/pdf/docs/14412.pdf

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