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